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-rw-r--r--mysql-test/main/join_cache.result6405
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+DROP TABLE IF EXISTS t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+DROP DATABASE IF EXISTS world;
+set @org_optimizer_switch=@@optimizer_switch;
+set @save_join_cache_level=@@join_cache_level;
+set @save_join_buffer_space_limit=@@join_buffer_space_limit;
+set @save_join_buffer_size=@@join_buffer_size;
+set @save_expensive_subquery_limit=@@expensive_subquery_limit;
+set @@optimizer_switch='optimize_join_buffer_size=on';
+set @@optimizer_switch='semijoin=on,firstmatch=on,loosescan=on';
+set @@optimizer_switch='semijoin_with_cache=on';
+set @@optimizer_switch='outer_join_with_cache=on';
+set @@optimizer_switch='mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
+set @local_optimizer_switch=@@optimizer_switch;
+set @innodb_stats_persistent_save= @@innodb_stats_persistent;
+set @innodb_stats_persistent_sample_pages_save=
+@@innodb_stats_persistent_sample_pages;
+set global innodb_stats_persistent= 1;
+set global innodb_stats_persistent_sample_pages=100;
+set names utf8;
+CREATE DATABASE world;
+use world;
+CREATE TABLE Country (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+Population int(11) NOT NULL default '0',
+Capital int(11) default NULL
+);
+CREATE TABLE City (
+ID int(11) NOT NULL,
+Name char(35) NOT NULL default '',
+Country char(3) NOT NULL default '',
+Population int(11) NOT NULL default '0'
+);
+CREATE TABLE CountryLanguage (
+Country char(3) NOT NULL default '',
+Language char(30) NOT NULL default '',
+Percentage float(3,1) NOT NULL default '0.0'
+);
+SELECT COUNT(*) FROM Country;
+COUNT(*)
+239
+SELECT COUNT(*) FROM City;
+COUNT(*)
+4079
+SELECT COUNT(*) FROM CountryLanguage;
+COUNT(*)
+984
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 262144
+set join_cache_level=1;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 1
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=2;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 2
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=3;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 3
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=4;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 4
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+China 1277558000 Zaozhuang 380846
+China 1277558000 Zaoyang 162198
+China 1277558000 Zalantun 130031
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+CREATE INDEX City_Population ON City(Population);
+CREATE INDEX City_Name ON City(Name);
+ANALYZE TABLE City;
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_range City_Population #hash#$hj:City_Population 3:4 world.Country.Code 24 Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_index_merge City_Population,City_Name #hash#$hj:City_Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(City_Population,City_Name); Using where; Using join buffer (flat, BNLH join)
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+China 1277558000 Zaozhuang 380846
+China 1277558000 Zaoyang 162198
+China 1277558000 Zalantun 130031
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+DROP INDEX City_Population ON City;
+DROP INDEX City_Name ON City;
+set join_cache_level=1;
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 256
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 1
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=2;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 2
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (flat, BNL join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage ALL NULL NULL NULL NULL 984 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE City ALL NULL NULL NULL NULL 4079 Using where; Using join buffer (incremental, BNL join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=3;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 3
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=4;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 4
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL NULL #hash#$hj 3 world.Country.Code 984 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE City hash_ALL NULL #hash#$hj 3 world.Country.Code 4079 Using where; Using join buffer (incremental, BNLH join)
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+set join_cache_level=@save_join_cache_level;
+set join_buffer_size=@save_join_buffer_size;
+DROP DATABASE world;
+CREATE DATABASE world;
+use world;
+CREATE TABLE Country (
+Code char(3) NOT NULL default '',
+Name char(52) NOT NULL default '',
+SurfaceArea float(10,2) NOT NULL default '0.00',
+Population int(11) NOT NULL default '0',
+Capital int(11) default NULL,
+PRIMARY KEY (Code),
+UNIQUE INDEX (Name)
+);
+CREATE TABLE City (
+ID int(11) NOT NULL auto_increment,
+Name char(35) NOT NULL default '',
+Country char(3) NOT NULL default '',
+Population int(11) NOT NULL default '0',
+PRIMARY KEY (ID),
+INDEX (Population),
+INDEX (Country)
+);
+CREATE TABLE CountryLanguage (
+Country char(3) NOT NULL default '',
+Language char(30) NOT NULL default '',
+Percentage float(3,1) NOT NULL default '0.0',
+PRIMARY KEY (Country, Language),
+INDEX (Percentage)
+);
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 262144
+set join_cache_level=3;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 3
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (flat, BNLH join); Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join)
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 262144
+set join_cache_level=4;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 4
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (incremental, BNLH join); Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage hash_ALL PRIMARY #hash#PRIMARY 33 world.Country.Code,const 984 Using where; Using join buffer (flat, BNLH join)
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range Name Name 52 NULL # Using index condition; Using where; Rowid-ordered scan
+1 SIMPLE City hash_range Population,Country #hash#Country:Population 3:4 world.Country.Code # Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+CREATE INDEX City_Name ON City(Name);
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range Name Name 52 NULL 17 Using index condition; Using where; Rowid-ordered scan
+1 SIMPLE City hash_index_merge Population,Country,City_Name #hash#Country:Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join)
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+Name Population Name Population
+China 1277558000 Shanghai 9696300
+China 1277558000 Peking 7472000
+China 1277558000 Chongqing 6351600
+China 1277558000 Tianjin 5286800
+China 1277558000 Zaozhuang 380846
+China 1277558000 Zaoyang 162198
+China 1277558000 Zalantun 130031
+Colombia 42321000 Santafé de Bogotá 6260862
+Congo, The Democratic Republic of the 51654000 Kinshasa 5064000
+Chile 15211000 NULL NULL
+Cambodia 11168000 NULL NULL
+Cameroon 15085000 NULL NULL
+Canada 31147000 NULL NULL
+Cuba 11201000 NULL NULL
+Côte d?Ivoire 14786000 NULL NULL
+Czech Republic 10278100 NULL NULL
+DROP INDEX City_Name ON City;
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 262144
+set join_cache_level=5;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 5
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 6
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+set join_cache_level=7;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 7
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+set join_cache_level=8;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 8
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+EXPLAIN
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 Using where
+1 SIMPLE CountryLanguage eq_ref PRIMARY PRIMARY 33 world.Country.Code,const 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+FROM Country LEFT JOIN CountryLanguage ON
+(CountryLanguage.Country=Country.Code AND Language='English')
+WHERE
+Country.Population > 10000000;
+Name IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
+Australia 81.2
+United Kingdom 97.3
+Canada 60.4
+United States 86.2
+Zimbabwe 2.2
+Japan 0.1
+South Africa 8.5
+Malaysia 1.6
+Afghanistan NULL
+Netherlands NULL
+Algeria NULL
+Angola NULL
+Argentina NULL
+Bangladesh NULL
+Belgium NULL
+Brazil NULL
+Burkina Faso NULL
+Chile NULL
+Ecuador NULL
+Egypt NULL
+Spain NULL
+Ethiopia NULL
+Philippines NULL
+Ghana NULL
+Guatemala NULL
+Indonesia NULL
+India NULL
+Iraq NULL
+Iran NULL
+Italy NULL
+Yemen NULL
+Yugoslavia NULL
+Cambodia NULL
+Cameroon NULL
+Kazakstan NULL
+Kenya NULL
+China NULL
+Colombia NULL
+Congo, The Democratic Republic of the NULL
+North Korea NULL
+South Korea NULL
+Greece NULL
+Cuba NULL
+Madagascar NULL
+Malawi NULL
+Mali NULL
+Morocco NULL
+Mexico NULL
+Mozambique NULL
+Myanmar NULL
+Nepal NULL
+Niger NULL
+Nigeria NULL
+Côte d?Ivoire NULL
+Pakistan NULL
+Peru NULL
+Poland NULL
+France NULL
+Romania NULL
+Germany NULL
+Saudi Arabia NULL
+Somalia NULL
+Sri Lanka NULL
+Sudan NULL
+Syria NULL
+Taiwan NULL
+Tanzania NULL
+Thailand NULL
+Czech Republic NULL
+Türkiye NULL
+Uganda NULL
+Ukraine NULL
+Hungary NULL
+Uzbekistan NULL
+Belarus NULL
+Venezuela NULL
+Russian Federation NULL
+Vietnam NULL
+set join_buffer_size=256;
+show variables like 'join_buffer_size';
+Variable_name Value
+join_buffer_size 256
+set join_cache_level=3;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 3
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (flat, BNLH join); Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=4;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 4
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country hash_ALL PRIMARY #hash#PRIMARY 3 world.City.Country 239 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE CountryLanguage hash_ALL|filter PRIMARY,Percentage #hash#PRIMARY|Percentage 3|4 world.City.Country 984 (19%) Using where; Using join buffer (incremental, BNLH join); Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City hash_ALL Population,Country #hash#Country 3 world.Country.Code 4079 Using where; Using join buffer (flat, BNLH join)
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=5;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 5
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=6;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 6
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=7;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 7
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=8;
+show variables like 'join_cache_level';
+Variable_name Value
+join_cache_level 8
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 SIMPLE City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+EXPLAIN
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City ALL Country NULL NULL NULL 4079 Using where
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE CountryLanguage ref|filter PRIMARY,Percentage PRIMARY|Percentage 3|4 world.City.Country 4 (19%) Using index condition(BKA); Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan; Using rowid filter
+SELECT City.Name, Country.Name, CountryLanguage.Language
+FROM City,Country,CountryLanguage
+WHERE City.Country=Country.Code AND
+CountryLanguage.Country=Country.Code AND
+City.Name LIKE 'L%' AND Country.Population > 3000000 AND
+CountryLanguage.Percentage > 50 AND
+LENGTH(Language) < LENGTH(City.Name) - 2;
+Name Name Language
+La Matanza Argentina Spanish
+Lagos de Moreno Mexico Spanish
+Lalitapur Nepal Nepali
+Las Margaritas Mexico Spanish
+Las Palmas de Gran Canaria Spain Spanish
+Lashio (Lasho) Myanmar Burmese
+Lauro de Freitas Brazil Portuguese
+Lengshuijiang China Chinese
+Leninsk-Kuznetski Russian Federation Russian
+Leverkusen Germany German
+Lexington-Fayette United States English
+Liangcheng China Chinese
+Lianyungang China Chinese
+Little Rock United States English
+Liupanshui China Chinese
+Lleida (Lérida) Spain Spanish
+Lomas de Zamora Argentina Spanish
+Long Beach United States English
+Los Angeles Chile Spanish
+Los Angeles United States English
+Los Teques Venezuela Spanish
+Louisville United States English
+Lower Hutt New Zealand English
+Luchou Taiwan Min
+Ludwigshafen am Rhein Germany German
+Lungtan Taiwan Min
+L´Hospitalet de Llobregat Spain Spanish
+Lázaro Cárdenas Mexico Spanish
+EXPLAIN
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY Country range PRIMARY,Name Name 52 NULL 10 Using index condition; Rowid-ordered scan
+1 PRIMARY City ref Population,Country Country 3 world.Country.Code 17 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT Name FROM City
+WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
+City.Population > 100000;
+Name
+Vientiane
+Riga
+Daugavpils
+Maseru
+Beirut
+Tripoli
+Monrovia
+Tripoli
+Bengasi
+Misrata
+Vilnius
+Kaunas
+Klaipeda
+?iauliai
+Panevezys
+set join_cache_level=@save_join_cache_level;
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=1;
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+Name Name
+Alexandria Egypt
+Ankara Türkiye
+Baghdad Iraq
+Bangkok Thailand
+Berlin Germany
+Cairo Egypt
+Calcutta [Kolkata] India
+Chengdu China
+Chennai (Madras) India
+Chongqing China
+Ciudad de México Mexico
+Delhi India
+Dhaka Bangladesh
+Harbin China
+Ho Chi Minh City Vietnam
+Istanbul Türkiye
+Jakarta Indonesia
+Jokohama [Yokohama] Japan
+Kanton [Guangzhou] China
+Karachi Pakistan
+Kinshasa Congo, The Democratic Republic of the
+Lahore Pakistan
+Lima Peru
+London United Kingdom
+Los Angeles United States
+Moscow Russian Federation
+Mumbai (Bombay) India
+New York United States
+Peking China
+Pusan South Korea
+Rangoon (Yangon) Myanmar
+Rio de Janeiro Brazil
+Riyadh Saudi Arabia
+Santafé de Bogotá Colombia
+Santiago de Chile Chile
+Seoul South Korea
+Shanghai China
+Shenyang China
+Singapore Singapore
+St Petersburg Russian Federation
+Sydney Australia
+São Paulo Brazil
+Teheran Iran
+Tianjin China
+Tokyo Japan
+Wuhan China
+set join_cache_level=8;
+set join_buffer_size=384;
+EXPLAIN
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE City range Population,Country Population 4 NULL # Using index condition; Rowid-ordered scan
+1 SIMPLE Country eq_ref PRIMARY PRIMARY 3 world.City.Country # Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND City.Population > 3000000;
+Name Name
+Alexandria Egypt
+Ankara Türkiye
+Baghdad Iraq
+Bangkok Thailand
+Berlin Germany
+Cairo Egypt
+Calcutta [Kolkata] India
+Chengdu China
+Chennai (Madras) India
+Chongqing China
+Ciudad de México Mexico
+Delhi India
+Dhaka Bangladesh
+Harbin China
+Ho Chi Minh City Vietnam
+Istanbul Türkiye
+Jakarta Indonesia
+Jokohama [Yokohama] Japan
+Kanton [Guangzhou] China
+Karachi Pakistan
+Kinshasa Congo, The Democratic Republic of the
+Lahore Pakistan
+Lima Peru
+London United Kingdom
+Los Angeles United States
+Moscow Russian Federation
+Mumbai (Bombay) India
+New York United States
+Peking China
+Pusan South Korea
+Rangoon (Yangon) Myanmar
+Rio de Janeiro Brazil
+Riyadh Saudi Arabia
+Santafé de Bogotá Colombia
+Santiago de Chile Chile
+Seoul South Korea
+Shanghai China
+Shenyang China
+Singapore Singapore
+St Petersburg Russian Federation
+Sydney Australia
+São Paulo Brazil
+Teheran Iran
+Tianjin China
+Tokyo Japan
+Wuhan China
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=6;
+ALTER TABLE Country MODIFY Name varchar(52) NOT NULL default '';
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+ALTER TABLE Country MODIFY Name varchar(300) NOT NULL default '';
+SELECT City.Name, Country.Name FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name
+?iauliai Lithuania
+Beirut Lebanon
+Bengasi Libyan Arab Jamahiriya
+Daugavpils Latvia
+Kaunas Lithuania
+Klaipeda Lithuania
+Maseru Lesotho
+Misrata Libyan Arab Jamahiriya
+Monrovia Liberia
+Panevezys Lithuania
+Riga Latvia
+Tripoli Lebanon
+Tripoli Libyan Arab Jamahiriya
+Vientiane Laos
+Vilnius Lithuania
+ALTER TABLE Country ADD COLUMN PopulationBar text;
+UPDATE Country
+SET PopulationBar=REPEAT('x', CAST(Population/100000 AS unsigned int));
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name PopulationBar
+?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
+Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
+Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+set join_buffer_size=256;
+SELECT City.Name, Country.Name, Country.PopulationBar FROM City,Country
+WHERE City.Country=Country.Code AND
+Country.Name LIKE 'L%' AND City.Population > 100000;
+Name Name PopulationBar
+?iauliai Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Beirut Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Bengasi Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Daugavpils Latvia xxxxxxxxxxxxxxxxxxxxxxxx
+Kaunas Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Klaipeda Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Maseru Lesotho xxxxxxxxxxxxxxxxxxxxxx
+Misrata Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Monrovia Liberia xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Panevezys Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Riga Latvia xxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli Lebanon xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Tripoli Libyan Arab Jamahiriya xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vientiane Laos xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+Vilnius Lithuania xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+set join_cache_level=@save_join_cache_level;
+set join_buffer_size=@save_join_buffer_size;
+#
+# MDEV-17752: Plan changes from hash_index_merge to index_merge with new optimizer defaults
+#
+set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
+set @save_use_stat_tables=@@use_stat_tables;
+set optimizer_use_condition_selectivity=4;
+set use_stat_tables='preferably';
+use world;
+set join_cache_level=4;
+CREATE INDEX City_Name ON City(Name);
+ANALYZE TABLE City, Country;
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND City.Population > 5000000
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range Name Name 302 NULL 15 Using index condition; Using where; Rowid-ordered scan
+1 SIMPLE City hash_range Population,Country #hash#Country:Population 3:4 world.Country.Code 24 Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
+EXPLAIN
+SELECT Country.Name, Country.Population, City.Name, City.Population
+FROM Country LEFT JOIN City
+ON City.Country=Country.Code AND
+(City.Population > 5000000 OR City.Name LIKE 'Za%')
+WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE Country range Name Name 302 NULL 15 Using index condition; Using where; Rowid-ordered scan
+1 SIMPLE City hash_index_merge Population,Country,City_Name #hash#Country:Population,City_Name 3:4,35 world.Country.Code 96 Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join)
+set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
+set @@use_stat_tables=@save_use_stat_tables;
+set @@join_cache_level=@save_join_cache_level;
+DROP DATABASE world;
+use test;
+CREATE TABLE t1(
+affiliatetometaid int NOT NULL default '0',
+uniquekey int NOT NULL default '0',
+metaid int NOT NULL default '0',
+affiliateid int NOT NULL default '0',
+xml text,
+isactive char(1) NOT NULL default 'Y',
+PRIMARY KEY (affiliatetometaid)
+);
+CREATE UNIQUE INDEX t1_uniquekey ON t1(uniquekey);
+CREATE INDEX t1_affiliateid ON t1(affiliateid);
+CREATE INDEX t1_metaid on t1 (metaid);
+INSERT INTO t1 VALUES
+(1616, 1571693233, 1391, 2, NULL, 'Y'), (1943, 1993216749, 1726, 2, NULL, 'Y');
+CREATE TABLE t2(
+metaid int NOT NULL default '0',
+name varchar(80) NOT NULL default '',
+dateadded timestamp NOT NULL ,
+xml text,
+status int default NULL,
+origin int default NULL,
+gid int NOT NULL default '1',
+formattypeid int default NULL,
+PRIMARY KEY (metaid)
+);
+CREATE INDEX t2_status ON t2(status);
+CREATE INDEX t2_gid ON t2(gid);
+CREATE INDEX t2_formattypeid ON t2(formattypeid);
+INSERT INTO t2 VALUES
+(1391, "I Just Died", "2003-10-02 10:07:37", "", 1, NULL, 3, NULL),
+(1726, "Me, Myself & I", "2003-12-05 11:24:36", " ", 1, NULL, 3, NULL);
+CREATE TABLE t3(
+mediaid int NOT NULL ,
+metaid int NOT NULL default '0',
+formatid int NOT NULL default '0',
+status int default NULL,
+path varchar(100) NOT NULL default '',
+datemodified timestamp NOT NULL default now(),
+resourcetype int NOT NULL default '1',
+parameters text,
+signature int default NULL,
+quality int NOT NULL default '255',
+PRIMARY KEY (mediaid)
+);
+CREATE INDEX t3_metaid ON t3(metaid);
+CREATE INDEX t3_formatid ON t3(formatid);
+CREATE INDEX t3_status ON t3(status);
+CREATE INDEX t3_metaidformatid ON t3(metaid,formatid);
+CREATE INDEX t3_signature ON t3(signature);
+CREATE INDEX t3_quality ON t3(quality);
+INSERT INTO t3 VALUES
+(6, 4, 8, 0, "010101_anastacia_spmidi.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255),
+(3343, 3, 8, 1, "010102_4VN4bsPwnxRQUJW5Zp1RhG2IL9vvl_8.mid", "2004-03-16 13:40:00", 1, NULL, NULL, 255);
+insert into t3 (mediaid, formatid) values (1000,1),(1001,2),(1002,3),(1003,1),(1004,2),(1005,3);
+CREATE TABLE t4(
+formatid int NOT NULL ,
+name varchar(60) NOT NULL default '',
+formatclassid int NOT NULL default '0',
+mime varchar(60) default NULL,
+extension varchar(10) default NULL,
+priority int NOT NULL default '0',
+canaddtocapability char(1) NOT NULL default 'Y',
+PRIMARY KEY (formatid)
+);
+CREATE INDEX t4_formatclassid ON t4(formatclassid);
+CREATE INDEX t4_formats_idx ON t4(canaddtocapability);
+INSERT INTO t4 VALUES
+(19, "XHTML", 11, "text/html", "xhtml", 10, 'Y'),
+(54, "AMR (wide band)", 13, "audio/amr-wb", "awb", 0, 'Y');
+CREATE TABLE t5(
+formatclassid int NOT NULL ,
+name varchar(60) NOT NULL default '',
+priority int NOT NULL default '0',
+formattypeid int NOT NULL default '0',
+PRIMARY KEY (formatclassid)
+);
+CREATE INDEX t5_formattypeid on t5(formattypeid);
+INSERT INTO t5 VALUES
+(11, "Info", 0, 4), (13, "Digital Audio", 0, 2);
+CREATE TABLE t6(
+formattypeid int NOT NULL ,
+name varchar(60) NOT NULL default '',
+priority int default NULL,
+PRIMARY KEY (formattypeid)
+);
+INSERT INTO t6 VALUES
+(2, "Ringtones", 0);
+CREATE TABLE t7(
+metaid int NOT NULL default '0',
+artistid int NOT NULL default '0',
+PRIMARY KEY (metaid,artistid)
+);
+INSERT INTO t7 VALUES
+(4, 5), (3, 4);
+CREATE TABLE t8(
+artistid int NOT NULL ,
+name varchar(80) NOT NULL default '',
+PRIMARY KEY (artistid)
+);
+INSERT INTO t8 VALUES
+(5, "Anastacia"), (4, "John Mayer");
+CREATE TABLE t9(
+subgenreid int NOT NULL default '0',
+metaid int NOT NULL default '0',
+PRIMARY KEY (subgenreid,metaid)
+) ;
+CREATE INDEX t9_subgenreid ON t9(subgenreid);
+CREATE INDEX t9_metaid ON t9(metaid);
+INSERT INTO t9 VALUES
+(138, 4), (31, 3);
+CREATE TABLE t10(
+subgenreid int NOT NULL ,
+genreid int NOT NULL default '0',
+name varchar(80) NOT NULL default '',
+PRIMARY KEY (subgenreid)
+) ;
+CREATE INDEX t10_genreid ON t10(genreid);
+INSERT INTO t10 VALUES
+(138, 19, ''), (31, 3, '');
+CREATE TABLE t11(
+genreid int NOT NULL default '0',
+name char(80) NOT NULL default '',
+priority int NOT NULL default '0',
+masterclip char(1) default NULL,
+PRIMARY KEY (genreid)
+) ;
+CREATE INDEX t11_masterclip ON t11( masterclip);
+INSERT INTO t11 VALUES
+(19, "Pop & Dance", 95, 'Y'), (3, "Rock & Alternative", 100, 'Y');
+set join_cache_level=6;
+EXPLAIN
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+t8.name AS artistName, t8.artistid,
+t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+t10.subgenreid, t10.name AS subgenreName,
+t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+t4.priority + t5.priority + t6.priority AS overallPriority,
+t3.path AS path, t3.mediaid,
+t4.formatid, t4.name AS formatName,
+t5.formatclassid, t5.name AS formatclassName,
+t6.formattypeid, t6.name AS formattypeName
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
+t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
+t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
+t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+t1.metaid = t2.metaid AND t1.affiliateid = '2';
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t6 system PRIMARY NULL NULL NULL 1
+1 SIMPLE t5 ref PRIMARY,t5_formattypeid t5_formattypeid 4 const 1
+1 SIMPLE t1 ref t1_affiliateid,t1_metaid t1_affiliateid 4 const 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t7 ref PRIMARY PRIMARY 4 test.t1.metaid 1 Using index
+1 SIMPLE t8 eq_ref PRIMARY PRIMARY 4 test.t7.artistid 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t3 ref t3_metaid,t3_formatid,t3_metaidformatid t3_metaidformatid 4 test.t1.metaid 1 Using index condition; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t4 eq_ref PRIMARY,t4_formatclassid,t4_formats_idx PRIMARY 4 test.t3.formatid 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t9 index PRIMARY,t9_subgenreid,t9_metaid PRIMARY 8 NULL 2 Using where; Using index; Using join buffer (incremental, BNL join)
+1 SIMPLE t10 eq_ref PRIMARY,t10_genreid PRIMARY 4 test.t9.subgenreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t11 eq_ref PRIMARY PRIMARY 4 test.t10.genreid 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT t1.uniquekey, t1.xml AS affiliateXml,
+t8.name AS artistName, t8.artistid,
+t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
+t10.subgenreid, t10.name AS subgenreName,
+t2.name AS metaName, t2.metaid, t2.xml AS metaXml,
+t4.priority + t5.priority + t6.priority AS overallPriority,
+t3.path AS path, t3.mediaid,
+t4.formatid, t4.name AS formatName,
+t5.formatclassid, t5.name AS formatclassName,
+t6.formattypeid, t6.name AS formattypeName
+FROM t1, t2, t3, t4, t5, t6, t7, t8, t9, t10, t11
+WHERE t7.metaid = t2.metaid AND t7.artistid = t8.artistid AND
+t9.metaid = t2.metaid AND t9.subgenreid = t10.subgenreid AND
+t10.genreid = t11.genreid AND t3.metaid = t2.metaid AND
+t3.formatid = t4.formatid AND t4.formatclassid = t5.formatclassid AND
+t4.canaddtocapability = 'Y' AND t5.formattypeid = t6.formattypeid AND
+t6.formattypeid IN (2) AND (t3.formatid IN (31, 8, 76)) AND
+t1.metaid = t2.metaid AND t1.affiliateid = '2';
+uniquekey affiliateXml artistName artistid genreName genreid genrePriority subgenreid subgenreName metaName metaid metaXml overallPriority path mediaid formatid formatName formatclassid formatclassName formattypeid formattypeName
+DROP TABLE t1,t2,t3,t4,t5,t6,t7,t8,t9,t10,t11;
+CREATE TABLE t1 (a1 int, filler1 char(64) default ' ' );
+CREATE TABLE t2 (
+a2 int, b2 int, filler2 char(64) default ' ',
+PRIMARY KEY idx(a2,b2,filler2)
+) ;
+Warnings:
+Warning 1280 Name 'idx' ignored for PRIMARY key.
+CREATE TABLE t3 (b3 int, c3 int, INDEX idx(b3));
+INSERT INTO t1(a1) VALUES
+(4), (7), (1), (9), (8), (5), (3), (6), (2);
+INSERT INTO t2(a2,b2) VALUES
+(1,30), (3,40), (2,61), (6,73), (8,92), (9,27), (4,18), (5,84), (7,56),
+(4,14), (6,76), (8,98), (7,55), (1,39), (2,68), (3,45), (9,21), (5,81),
+(5,88), (2,65), (6,74), (9,23), (1,37), (3,44), (4,17), (8,99), (7,51),
+(9,28), (7,52), (1,33), (4,13), (5,87), (3,43), (8,91), (2,62), (6,79),
+(3,49), (8,93), (7,34), (5,82), (6,78), (2,63), (1,32), (9,22), (4,11);
+INSERT INTO t3 VALUES
+(30,302), (92,923), (18,187), (45,459), (30,309),
+(39,393), (68,685), (45,458), (21,210), (81,817),
+(40,405), (61,618), (73,738), (92,929), (27,275),
+(18,188), (84,846), (56,564), (14,144), (76,763),
+(98,982), (55,551), (17,174), (99,998), (51,513),
+(28,282), (52,527), (33,336), (13,138), (87,878),
+(43,431), (91,916), (62,624), (79,797), (49,494),
+(93,933), (34,347), (82,829), (78,780), (63,634),
+(32,329), (22,228), (11,114), (74,749), (23,236);
+set join_cache_level=1;
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where
+1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
+1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+a1<>a2 a1 a2 b2 b3 c3 s1 s2
+0 4 4 13 13 138
+0 4 4 18 18 188
+0 1 1 30 30 309
+0 1 1 32 32 329
+0 9 9 22 22 228
+0 8 8 92 92 929
+0 8 8 99 99 998
+0 5 5 82 82 829
+0 5 5 87 87 878
+0 3 3 45 45 459
+0 3 3 45 45 458
+0 6 6 73 73 738
+0 6 6 74 74 749
+0 2 2 61 61 618
+set join_cache_level=5;
+set join_buffer_size=512;
+EXPLAIN
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 9 Using where
+1 SIMPLE t2 ref PRIMARY PRIMARY 4 test.t1.a1 1 Using index
+1 SIMPLE t3 ref idx idx 5 test.t2.b2 5 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT a1<>a2, a1, a2, b2, b3, c3,
+SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
+FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
+a1<>a2 a1 a2 b2 b3 c3 s1 s2
+0 4 4 18 18 188
+0 4 4 13 13 138
+0 1 1 30 30 309
+0 1 1 32 32 329
+0 9 9 22 22 228
+0 8 8 92 92 929
+0 8 8 99 99 998
+0 5 5 82 82 829
+0 3 3 45 45 459
+0 3 3 45 45 458
+0 5 5 87 87 878
+0 2 2 61 61 618
+0 6 6 73 73 738
+0 6 6 74 74 749
+DROP TABLE t1,t2,t3;
+CREATE TABLE t1 (a int, b int, INDEX idx(b));
+CREATE TABLE t2 (a int, b int, INDEX idx(a));
+INSERT INTO t1 VALUES (5,30), (3,20), (7,40), (2,10), (8,30), (1,10), (4,20);
+INSERT INTO t2 VALUES (7,10), (1,20), (2,20), (8,20), (8,10), (1,20);
+INSERT INTO t2 VALUES (1,10), (4,20), (3,20), (7,20), (7,10), (1,20);
+INSERT INTO t2 VALUES (17,10), (11,20), (12,20), (18,20), (18,10), (11,20);
+INSERT INTO t2 VALUES (11,10), (14,20), (13,20), (17,20), (17,10), (11,20);
+set join_buffer_size=32;
+Warnings:
+Warning 1292 Truncated incorrect join_buffer_size value: '32'
+set join_cache_level=8;
+EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx idx 5 NULL 3 Using index condition; Using where; Rowid-ordered scan
+1 SIMPLE t2 ref idx idx 5 test.t1.a 2 Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
+a b a b
+7 40 7 10
+7 40 7 10
+7 40 7 20
+8 30 8 10
+8 30 8 20
+DROP TABLE t1,t2;
+#
+# Bug #40134: outer join with not exists optimization and join buffer
+#
+set join_cache_level=@save_join_cache_level;
+set join_buffer_size=@save_join_buffer_size;
+CREATE TABLE t1 (a int NOT NULL);
+INSERT INTO t1 VALUES (2), (4), (3), (5), (1);
+CREATE TABLE t2 (a int NOT NULL, b int NOT NULL, INDEX i_a(a));
+INSERT INTO t2 VALUES (4,10), (2,10), (2,30), (2,20), (4,20);
+INSERT INTO t2 VALUES (14,10), (12,10), (15,30), (12,20), (14,20);
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 5
+1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+a a b
+3 NULL NULL
+5 NULL NULL
+1 NULL NULL
+SET join_cache_level=6;
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 5
+1 SIMPLE t2 ref i_a i_a 4 test.t1.a 2 Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
+a a b
+3 NULL NULL
+5 NULL NULL
+1 NULL NULL
+DROP TABLE t1, t2;
+set join_cache_level=@save_join_cache_level;
+set join_buffer_size=@save_join_buffer_size;
+#
+# BUG#40136: Group by is ignored when join buffer is used for an outer join
+#
+create table t1(a int PRIMARY KEY, b int);
+insert into t1 values
+(5, 10), (2, 70), (7, 80), (6, 20), (1, 50), (9, 40), (8, 30), (3, 60);
+create table t2 (p int, a int, INDEX i_a(a));
+insert into t2 values
+(103, 7), (109, 3), (102, 3), (108, 1), (106, 3),
+(107, 7), (105, 1), (101, 3), (100, 7), (110, 1);
+set @save_join_cache_level=@@join_cache_level;
+set join_cache_level=6;
+The following must not show "using join cache":
+explain
+select t1.a, count(t2.p) as count
+from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 8 Using index; Using temporary; Using filesort
+1 SIMPLE t2 ref i_a i_a 5 test.t1.a 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+select t1.a, count(t2.p) as count
+from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
+a count
+1 1
+2 0
+3 2
+5 0
+6 0
+7 2
+8 0
+9 0
+set join_cache_level=@save_join_cache_level;
+drop table t1, t2;
+#
+# BUG#40268: Nested outer join with not null-rejecting where condition
+# over an inner table which is not the last in the nest
+#
+CREATE TABLE t2 (a int, b int, c int);
+CREATE TABLE t3 (a int, b int, c int);
+CREATE TABLE t4 (a int, b int, c int);
+INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
+INSERT INTO t3 VALUES (1,2,0), (2,2,0);
+INSERT INTO t4 VALUES (3,2,0), (4,2,0);
+set join_cache_level=6;
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2 LEFT JOIN (t3, t4) ON t2.b=t4.b
+WHERE t3.a+2<t2.a OR t3.c IS NULL;
+a b a b a b
+4 2 1 2 3 2
+4 2 1 2 4 2
+3 3 NULL NULL NULL NULL
+5 3 NULL NULL NULL NULL
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t2, t3, t4;
+#
+# Bug #40192: outer join with where clause when using BNL
+#
+create table t1 (a int, b int);
+insert into t1 values (2, 20), (3, 30), (1, 10);
+create table t2 (a int, c int);
+insert into t2 values (1, 101), (3, 102), (1, 100);
+set join_cache_level=6;
+select * from t1 left join t2 on t1.a=t2.a;
+a b a c
+1 10 1 101
+3 30 3 102
+1 10 1 100
+2 20 NULL NULL
+explain select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3
+1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t1.a 3 Using where; Using join buffer (flat, BNLH join)
+select * from t1 left join t2 on t1.a=t2.a where t2.c=102 or t2.c is null;
+a b a c
+3 30 3 102
+2 20 NULL NULL
+set join_cache_level=@save_join_cache_level;
+drop table t1, t2;
+#
+# Bug #40317: outer join with with constant on expression equal to FALSE
+#
+create table t1 (a int);
+insert into t1 values (30), (40), (20);
+create table t2 (b int);
+insert into t2 values (200), (100);
+set join_cache_level=6;
+select * from t1 left join t2 on (1=0);
+a b
+30 NULL
+40 NULL
+20 NULL
+explain select * from t1 left join t2 on (1=0) where a=40;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
+select * from t1 left join t2 on (1=0) where a=40;
+a b
+40 NULL
+set join_cache_level=0;
+explain select * from t1 left join t2 on (1=0);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
+set join_cache_level=@save_join_cache_level;
+drop table t1, t2;
+#
+# Bug #41204: small buffer with big rec_per_key for ref access
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (0);
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1 VALUES (20000), (10000);
+CREATE TABLE t2 (pk int AUTO_INCREMENT PRIMARY KEY, b int, c int, INDEX idx(b));
+INSERT INTO t2(b,c) VALUES (10000, 3), (20000, 7), (20000, 1), (10000, 9), (20000, 5);
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+INSERT INTO t2(b,c) SELECT b,c FROM t2;
+ANALYZE TABLE t1,t2;
+set join_cache_level=6;
+set join_buffer_size=1024;
+EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2050 Using where
+1 SIMPLE t2 ref idx idx 5 test.t1.a 640 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
+AVG(c)
+5.0000
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1, t2;
+#
+# Bug #41894: big join buffer of level 7 used to join records
+# with null values in place of varchar strings
+#
+CREATE TABLE t1 (a int NOT NULL AUTO_INCREMENT PRIMARY KEY,
+b varchar(127) DEFAULT NULL);
+INSERT INTO t1(a) VALUES (1);
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+INSERT INTO t1(b) SELECT b FROM t1;
+CREATE TABLE t2 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t2 SELECT * FROM t1;
+CREATE TABLE t3 (a int NOT NULL PRIMARY KEY, b varchar(127) DEFAULT NULL);
+INSERT INTO t3 SELECT * FROM t1;
+set join_cache_level=7;
+set join_buffer_size=1024*1024;
+EXPLAIN
+SELECT COUNT(*) FROM t1,t2,t3
+WHERE t1.a=t2.a AND t2.a=t3.a AND
+t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 16384 Using where
+1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT COUNT(*) FROM t1,t2,t3
+WHERE t1.a=t2.a AND t2.a=t3.a AND
+t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
+COUNT(*)
+16384
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3;
+#
+# Bug #42020: join buffer is used for outer join with fields of
+# several outer tables in join buffer
+#
+CREATE TABLE t1 (
+a bigint NOT NULL,
+PRIMARY KEY (a)
+);
+INSERT INTO t1 VALUES
+(2), (1);
+CREATE TABLE t2 (
+a bigint NOT NULL,
+b bigint NOT NULL,
+PRIMARY KEY (a,b)
+);
+INSERT INTO t2 VALUES
+(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+(1,10), (1, 20), (1,30), (1,40), (1,50);
+CREATE TABLE t3 (
+pk bigint NOT NULL AUTO_INCREMENT,
+a bigint NOT NULL,
+b bigint NOT NULL,
+val bigint DEFAULT '0',
+PRIMARY KEY (pk),
+KEY idx (a,b)
+);
+INSERT INTO t3(a,b) VALUES
+(2,30), (2,40), (2,50), (2,60), (2,70), (2,80),
+(4,30), (4,40), (4,50), (4,60), (4,70), (4,80),
+(5,30), (5,40), (5,50), (5,60), (5,70), (5,80),
+(7,30), (7,40), (7,50), (7,60), (7,70), (7,80);
+set join_cache_level=0;
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
+WHERE t1.a=t2.a;
+a a a b b val
+1 1 NULL 10 NULL NULL
+1 1 NULL 20 NULL NULL
+1 1 NULL 30 NULL NULL
+1 1 NULL 40 NULL NULL
+1 1 NULL 50 NULL NULL
+2 2 2 30 30 0
+2 2 2 40 40 0
+2 2 2 50 50 0
+2 2 2 60 60 0
+2 2 2 70 70 0
+2 2 2 80 80 0
+set join_cache_level=6;
+set join_buffer_size=256;
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
+WHERE t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
+1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
+1 SIMPLE t3 ref idx idx 16 test.t1.a,test.t2.b 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
+WHERE t1.a=t2.a;
+a a a b b val
+1 1 NULL 10 NULL NULL
+1 1 NULL 20 NULL NULL
+1 1 NULL 30 NULL NULL
+1 1 NULL 40 NULL NULL
+1 1 NULL 50 NULL NULL
+2 2 2 30 30 0
+2 2 2 40 40 0
+2 2 2 50 50 0
+2 2 2 60 60 0
+2 2 2 70 70 0
+2 2 2 80 80 0
+DROP INDEX idx ON t3;
+set join_cache_level=2;
+EXPLAIN
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
+WHERE t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index PRIMARY PRIMARY 8 NULL 2 Using index
+1 SIMPLE t2 ref PRIMARY PRIMARY 8 test.t1.a 1 Using index
+1 SIMPLE t3 ALL NULL NULL NULL NULL 24 Using where; Using join buffer (flat, BNL join)
+SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val
+FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b)
+WHERE t1.a=t2.a;
+a a a b b val
+1 1 NULL 10 NULL NULL
+1 1 NULL 20 NULL NULL
+1 1 NULL 30 NULL NULL
+1 1 NULL 40 NULL NULL
+1 1 NULL 50 NULL NULL
+2 2 2 30 30 0
+2 2 2 40 40 0
+2 2 2 50 50 0
+2 2 2 60 60 0
+2 2 2 70 70 0
+2 2 2 80 80 0
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3;
+create table t1(f1 int, f2 int);
+insert into t1 values (1,1),(2,2),(3,3);
+create table t2(f1 int not null, f2 int not null, f3 char(200), key(f1,f2));
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+(2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+(4,4, 'qwerty');
+insert into t2 values (1,1, 'qwerty'),(1,2, 'qwerty'),(1,3, 'qwerty');
+insert into t2 values (2,1, 'qwerty'),(2,2, 'qwerty'),(2,3, 'qwerty'),
+(2,4, 'qwerty'),(2,5, 'qwerty');
+insert into t2 values (3,1, 'qwerty'),(3,4, 'qwerty');
+insert into t2 values (4,1, 'qwerty'),(4,2, 'qwerty'),(4,3, 'qwerty'),
+(4,4, 'qwerty');
+flush status;
+set join_cache_level=5;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1 f2 f3
+1 1 qwerty
+2 2 qwerty
+1 1 qwerty
+2 2 qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
+1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+show status like "Handler_icp%";
+Variable_name Value
+Handler_icp_attempts 20
+Handler_icp_match 4
+set join_cache_level=6;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1 f2 f3
+1 1 qwerty
+2 2 qwerty
+1 1 qwerty
+2 2 qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
+1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+show status like "Handler_icp%";
+Variable_name Value
+Handler_icp_attempts 40
+Handler_icp_match 8
+set join_cache_level=7;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1 f2 f3
+1 1 qwerty
+2 2 qwerty
+1 1 qwerty
+2 2 qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
+1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+show status like "Handler_icp%";
+Variable_name Value
+Handler_icp_attempts 60
+Handler_icp_match 12
+set join_cache_level=8;
+select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
+f1 f2 f3
+1 1 qwerty
+2 2 qwerty
+1 1 qwerty
+2 2 qwerty
+explain select t2.f1, t2.f2, t2.f3 from t1,t2
+where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using where
+1 SIMPLE t2 ref f1 f1 4 test.t1.f1 3 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+show status like "Handler_icp%";
+Variable_name Value
+Handler_icp_attempts 80
+Handler_icp_match 16
+drop table t1,t2;
+set join_cache_level=@save_join_cache_level;
+#
+# Bug #42955: join with GROUP BY/ORDER BY and when BKA is enabled
+#
+create table t1 (d int, id1 int, index idx1 (d, id1));
+insert into t1 values
+(3, 20), (2, 40), (3, 10), (1, 10), (3, 20), (1, 40), (2, 30), (3, 30);
+create table t2 (id1 int, id2 int, index idx2 (id1));
+insert into t2 values
+(20, 100), (30, 400), (20, 400), (30, 200), (10, 300), (10, 200), (40, 100),
+(40, 200), (30, 300), (10, 400), (20, 200), (20, 300);
+insert into t2 values
+(21, 10), (31, 400), (21, 400), (31, 200), (11, 300), (11, 200), (41, 100),
+(41, 200), (31, 300), (11, 400), (21, 200), (21, 300);
+set join_cache_level=6;
+explain
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
+where t1.d=3 group by t1.id1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort
+1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
+where t1.d=3 group by t1.id1;
+id1 sum(t2.id2)
+10 900
+20 2000
+30 900
+explain
+select t1.id1 from t1 join t2 on t1.id1=t2.id1
+where t1.d=3 and t2.id2 > 200 order by t1.id1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ref idx1 idx1 5 const 4 Using where; Using index; Using temporary; Using filesort
+1 SIMPLE t2 ref idx2 idx2 5 test.t1.id1 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+select t1.id1 from t1 join t2 on t1.id1=t2.id1
+where t1.d=3 and t2.id2 > 200 order by t1.id1;
+id1
+10
+10
+20
+20
+20
+20
+30
+30
+set join_cache_level=@save_join_cache_level;
+drop table t1,t2;
+#
+# Bug #44019: star-like multi-join query executed join_cache_level=6
+#
+create table t1 (a int, b int, c int, d int);
+create table t2 (b int, e varchar(16), index idx(b));
+create table t3 (d int, f varchar(16), index idx(d));
+create table t4 (c int, g varchar(16), index idx(c));
+insert into t1 values
+(5, 50, 500, 5000), (3, 30, 300, 3000), (9, 90, 900, 9000),
+(2, 20, 200, 2000), (4, 40, 400, 4000), (8, 80, 800, 800),
+(7, 70, 700, 7000);
+insert into t2 values
+(30, 'bbb'), (10, 'b'), (70, 'bbbbbbb'), (60, 'bbbbbb'),
+(31, 'bbb'), (11, 'b'), (71, 'bbbbbbb'), (61, 'bbbbbb'),
+(32, 'bbb'), (12, 'b'), (72, 'bbbbbbb'), (62, 'bbbbbb');
+insert into t2 values
+(130, 'bbb'), (110, 'b'), (170, 'bbbbbbb'), (160, 'bbbbbb'),
+(131, 'bbb'), (111, 'b'), (171, 'bbbbbbb'), (161, 'bbbbbb'),
+(132, 'bbb'), (112, 'b'), (172, 'bbbbbbb'), (162, 'bbbbbb');
+insert into t3 values
+(4000, 'dddd'), (3000, 'ddd'), (1000, 'd'), (8000, 'dddddddd'),
+(4001, 'dddd'), (3001, 'ddd'), (1001, 'd'), (8001, 'dddddddd'),
+(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
+insert into t3 values
+(14000, 'dddd'), (13000, 'ddd'), (11000, 'd'), (18000, 'dddddddd'),
+(14001, 'dddd'), (13001, 'ddd'), (11001, 'd'), (18001, 'dddddddd'),
+(4002, 'dddd'), (3002, 'ddd'), (1002, 'd'), (8002, 'dddddddd');
+insert into t4 values
+(200, 'cc'), (600, 'cccccc'), (300, 'ccc'), (500, 'ccccc'),
+(201, 'cc'), (601, 'cccccc'), (301, 'ccc'), (501, 'ccccc'),
+(202, 'cc'), (602, 'cccccc'), (302, 'ccc'), (502, 'ccccc');
+insert into t4 values
+(1200, 'cc'), (1600, 'cccccc'), (1300, 'ccc'), (1500, 'ccccc'),
+(1201, 'cc'), (1601, 'cccccc'), (1301, 'ccc'), (1501, 'ccccc'),
+(1202, 'cc'), (1602, 'cccccc'), (1302, 'ccc'), (1502, 'ccccc');
+analyze table t2,t3,t4;
+set join_cache_level=1;
+explain
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
+1 SIMPLE t2 ref idx idx 5 test.t1.b 1
+1 SIMPLE t4 ref idx idx 5 test.t1.c 1
+1 SIMPLE t3 ref idx idx 5 test.t1.d 1
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+a b c d e f g
+3 30 300 3000 bbb ddd ccc
+set join_cache_level=6;
+explain
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
+1 SIMPLE t2 ref idx idx 5 test.t1.b 1 Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t4 ref idx idx 5 test.t1.c 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t3 ref idx idx 5 test.t1.d 1 Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
+where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
+a b c d e f g
+3 30 300 3000 bbb ddd ccc
+set join_cache_level=@save_join_cache_level;
+drop table t1,t2,t3,t4;
+#
+# Bug #44250: Corruption of linked join buffers when using BKA
+#
+CREATE TABLE t1 (
+id1 bigint(20) DEFAULT NULL,
+id2 bigint(20) DEFAULT NULL,
+id3 bigint(20) DEFAULT NULL,
+num1 bigint(20) DEFAULT NULL,
+num2 int(11) DEFAULT NULL,
+num3 bigint(20) DEFAULT NULL
+);
+CREATE TABLE t2 (
+id3 bigint(20) NOT NULL DEFAULT '0',
+id4 bigint(20) DEFAULT NULL,
+enum1 enum('Enabled','Disabled','Paused') DEFAULT NULL,
+PRIMARY KEY (id3)
+);
+CREATE TABLE t3 (
+id4 bigint(20) NOT NULL DEFAULT '0',
+text1 text,
+PRIMARY KEY (id4)
+);
+CREATE TABLE t4 (
+id2 bigint(20) NOT NULL DEFAULT '0',
+dummy int(11) DEFAULT '0',
+PRIMARY KEY (id2)
+);
+CREATE TABLE t5 (
+id1 bigint(20) NOT NULL DEFAULT '0',
+id2 bigint(20) NOT NULL DEFAULT '0',
+enum2 enum('Active','Deleted','Paused') DEFAULT NULL,
+PRIMARY KEY (id1,id2)
+);
+set join_cache_level=8;
+set join_buffer_size=2048;
+EXPLAIN
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
+WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
+t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 349 Using where
+1 SIMPLE t2 eq_ref PRIMARY PRIMARY 8 test.t1.id3 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 8 test.t2.id4 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE t4 eq_ref PRIMARY PRIMARY 8 test.t1.id2 1 Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
+1 SIMPLE t5 eq_ref PRIMARY PRIMARY 16 test.t1.id1,test.t1.id2 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
+SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
+FROM t1 JOIN t2 JOIN t3 JOIN t4 JOIN t5
+WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and t4.id2=t1.id2 AND
+t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
+id1 num3 text1 id4 id3 dummy
+228172702 14 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
+228172702 134 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
+228172702 15 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
+228172702 3 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 2567095402 2667134182 0
+228808822 61 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 60 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 13 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 6 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 18 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 17 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 50 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 826928662 935693782 0
+228808822 89 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 19 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 9 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 84 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 14 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 10 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 26 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 4 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 3 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 28 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+228808822 62 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC 2381969632 2482416112 0
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4,t5;
+#
+# Bug#45267: Incomplete check caused wrong result.
+#
+CREATE TABLE t1 (
+`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+CREATE TABLE t3 (
+`pk` int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY
+);
+INSERT INTO t3 VALUES
+(1),(2),(3),(4),(5),(6),(7),(8),(9),(10),(11),(12),(13),(14),(15),
+(16),(17),(18),(19),(20);
+CREATE TABLE t2 (
+`pk` int(11) NOT NULL AUTO_INCREMENT,
+`int_nokey` int(11) NOT NULL,
+`time_key` time NOT NULL,
+PRIMARY KEY (`pk`),
+KEY `time_key` (`time_key`)
+);
+INSERT INTO t2 VALUES (10,9,'22:36:46'),(11,0,'08:46:46');
+SELECT DISTINCT t1.`pk`
+FROM t1 RIGHT JOIN t2 STRAIGHT_JOIN t3 ON t2.`int_nokey` ON t2.`time_key`
+GROUP BY 1;
+pk
+NULL
+DROP TABLE IF EXISTS t1, t2, t3;
+#
+# Bug #46328: Use of aggregate function without GROUP BY clause
+# returns many rows (vs. one )
+#
+CREATE TABLE t1 (
+int_key int(11) NOT NULL,
+KEY int_key (int_key)
+);
+INSERT INTO t1 VALUES
+(0),(2),(2),(2),(3),(4),(5),(5),(6),(6),(8),(8),(9),(9);
+CREATE TABLE t2 (
+int_key int(11) NOT NULL,
+KEY int_key (int_key)
+);
+INSERT INTO t2 VALUES (2),(3);
+
+# The query shall return 1 record with a max value 9 and one of the
+# int_key values inserted above (undefined which one). A changed
+# execution plan may change the value in the second column
+SELECT MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2
+ORDER BY t1.int_key;
+MAX(t1.int_key) int_key
+9 0
+
+explain
+SELECT MAX(t1.int_key), t1.int_key
+FROM t1 STRAIGHT_JOIN t2
+ORDER BY t1.int_key;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL int_key 4 NULL 14 Using index
+1 SIMPLE t2 index NULL int_key 4 NULL 2 Using index; Using join buffer (flat, BNL join)
+
+DROP TABLE t1,t2;
+SET join_cache_level=@save_join_cache_level;
+#
+# Regression test for
+# Bug#46733 - NULL value not returned for aggregate on empty result
+# set w/ semijoin on
+#
+CREATE TABLE t1 (
+i int(11) NOT NULL,
+v varchar(1) DEFAULT NULL,
+PRIMARY KEY (i)
+);
+INSERT INTO t1 VALUES (10,'a'),(11,'b'),(12,'c'),(13,'d');
+CREATE TABLE t2 (
+i int(11) NOT NULL,
+v varchar(1) DEFAULT NULL,
+PRIMARY KEY (i)
+);
+INSERT INTO t2 VALUES (1,'x'),(2,'y');
+
+SELECT MAX(t1.i)
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+MAX(t1.i)
+NULL
+Warnings:
+Warning 1292 Truncated incorrect DECIMAL value: 'x'
+Warning 1292 Truncated incorrect DECIMAL value: 'y'
+
+EXPLAIN
+SELECT MAX(t1.i)
+FROM t1 JOIN t2 ON t2.v
+ORDER BY t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 4 Using index; Using join buffer (flat, BNL join)
+
+DROP TABLE t1,t2;
+#
+# Bug #45092: join buffer contains two blob columns one of which is
+# used in the key employed to access the joined table
+#
+CREATE TABLE t1 (c1 int, c2 int, key (c2));
+INSERT INTO t1 VALUES (1,1);
+INSERT INTO t1 VALUES (2,2);
+CREATE TABLE t2 (c1 text, c2 text);
+INSERT INTO t2 VALUES('tt', 'uu');
+INSERT INTO t2 VALUES('zzzz', 'xxxxxxxxx');
+ANALYZE TABLE t1,t2;
+set join_cache_level=6;
+SELECT t1.*, t2.*, LENGTH(t2.c1), LENGTH(t2.c2) FROM t1,t2
+WHERE t1.c2=LENGTH(t2.c2) and t1.c1=LENGTH(t2.c1);
+c1 c2 c1 c2 LENGTH(t2.c1) LENGTH(t2.c2)
+2 2 tt uu 2 2
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #51092: linked join buffer is used for a 3-way cross join query
+# that selects only records of the first table
+#
+create table t1 (a int, b int);
+insert into t1 values (1,1),(2,2);
+create table t2 (a int, b int);
+insert into t2 values (1,1),(2,2);
+create table t3 (a int, b int);
+insert into t3 values (1,1),(2,2);
+set join_cache_level=1;
+explain select t1.* from t1,t2,t3;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
+select t1.* from t1,t2,t3;
+a b
+1 1
+2 2
+1 1
+2 2
+1 1
+2 2
+1 1
+2 2
+set join_cache_level=2;
+explain select t1.* from t1,t2,t3;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using join buffer (incremental, BNL join)
+select t1.* from t1,t2,t3;
+a b
+1 1
+2 2
+1 1
+2 2
+1 1
+2 2
+1 1
+2 2
+set join_cache_level=@save_join_cache_level;
+drop table t1,t2,t3;
+#
+# Bug #52394: using join buffer for 3 table join with ref access
+# LP #623209: and no references to the columns of the middle table
+#
+set join_cache_level=6;
+CREATE TABLE t1 (a int(11), b varchar(1));
+INSERT INTO t1 VALUES (6,'r'),(27,'o');
+CREATE TABLE t2(a int);
+INSERT INTO t2 VALUES(1),(2),(3),(4),(5);
+CREATE TABLE t3 (a int(11) primary key, b varchar(1));
+INSERT INTO t3 VALUES
+(14,'d'),(15,'z'),(16,'e'),(17,'h'),(18,'b'),(19,'s'),(20,'e'),
+(21,'j'),(22,'e'),(23,'f'),(24,'v'),(25,'x'),(26,'m'),(27,'o');
+EXPLAIN
+SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.a 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using join buffer (incremental, BNL join)
+SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
+a
+27
+27
+27
+27
+27
+DROP TABLE t1,t2,t3;
+set join_cache_level=@save_join_cache_level;
+#
+# Bug #51084: Batched key access crashes for SELECT with
+# derived table and LEFT JOIN
+#
+CREATE TABLE t1 (
+carrier int,
+id int PRIMARY KEY
+);
+INSERT INTO t1 VALUES (1,11),(1,12),(2,13);
+CREATE TABLE t2 (
+scan_date int,
+package_id int
+);
+INSERT INTO t2 VALUES (2008,21),(2008,22);
+CREATE TABLE t3 (
+carrier int PRIMARY KEY,
+id int
+);
+INSERT INTO t3 VALUES (1,31);
+CREATE TABLE t4 (
+carrier_id int,
+INDEX carrier_id(carrier_id)
+);
+INSERT INTO t4 VALUES (31),(32);
+SET join_cache_level=8;
+SELECT COUNT(*)
+FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
+ON t3.carrier = t1.carrier;
+COUNT(*)
+6
+EXPLAIN
+SELECT COUNT(*)
+FROM (t2 JOIN t1) LEFT JOIN (t3 JOIN t4 ON t3.id = t4.carrier_id)
+ON t3.carrier = t1.carrier;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2
+1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using join buffer (flat, BNL join)
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t1.carrier 1 Using where
+1 SIMPLE t4 ref carrier_id carrier_id 5 test.t3.id 2 Using index
+SET join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug #52636: allowing JOINs on NULL values w/ join_cache_level = 5-8
+#
+CREATE TABLE t1 (b int);
+INSERT INTO t1 VALUES (NULL),(3);
+CREATE TABLE t2 (a int, b int, KEY (b));
+INSERT INTO t2 VALUES
+(100,NULL),(150,200),(50,150),(250,350),(180,210),(100,150),
+(101,NULL),(151,200),(51,150),(251,350),(181,210),(101,150);
+set join_cache_level = 5;
+explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+a
+NULL
+NULL
+set join_cache_level = 8;
+explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+a
+NULL
+NULL
+delete from t1;
+INSERT INTO t1 VALUES (NULL),(NULL);
+set join_cache_level = 5;
+explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ref b b 5 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+a
+NULL
+NULL
+DROP TABLE t1,t2;
+CREATE TABLE t1 (b varchar(100));
+INSERT INTO t1 VALUES (NULL),("some varchar");
+CREATE TABLE t2 (a int, b varchar(100), KEY (b));
+INSERT INTO t2 VALUES (100,NULL),(150,"varchar"),(200,NULL),(250,"long long varchar");
+INSERT INTO t2 VALUES (100,NULL),(150,"long varchar"),(200,"varchar"),(250,"long long long varchar");
+set join_cache_level = 5;
+explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ref b b 103 test.t1.b 2 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+a
+NULL
+NULL
+set join_cache_level = 8;
+explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ref b b 103 test.t1.b 2 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b = t1.b;
+a
+NULL
+NULL
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #54359: Extra rows with join_cache_level=7,8 and two joins
+# and multi-column index"
+#
+CREATE TABLE t1 (
+pk int NOT NULL,
+a int DEFAULT NULL,
+b varchar(16) DEFAULT NULL,
+c varchar(16) DEFAULT NULL,
+INDEX idx (b,a))
+;
+INSERT INTO t1 VALUES (4,9,'k','k');
+INSERT INTO t1 VALUES (12,5,'k','k');
+set join_cache_level = 8;
+EXPLAIN
+SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
+WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE s ref idx idx 19 test.t.c 1 Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
+SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
+WHERE s.pk AND s.a >= t.pk AND s.b = t.c;
+a
+9
+9
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1;
+#
+# Bug #54235: Extra rows with join_cache_level=6,8 and two LEFT JOINs
+#
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (a int);
+CREATE TABLE t3 (a int);
+CREATE TABLE t4 (a int);
+INSERT INTO t1 VALUES (null), (2), (null), (1);
+set join_cache_level = 6;
+EXPLAIN
+SELECT t1.a
+FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
+WHERE t1.a OR t3.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 4
+1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
+SELECT t1.a
+FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
+WHERE t1.a OR t3.a;
+a
+2
+1
+EXPLAIN
+SELECT t1.a
+FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
+WHERE t1.a OR t4.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 4
+1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
+SELECT t1.a
+FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
+WHERE t1.a OR t4.a;
+a
+2
+1
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug #663840: Memory overwrite causing crash with hash join
+#
+SET SESSION join_cache_level=3;
+SET SESSION join_buffer_size=100;
+Warnings:
+Warning 1292 Truncated incorrect join_buffer_size value: '100'
+CREATE TABLE t3 (
+i int NOT NULL,
+j int NOT NULL,
+d date NOT NULL,
+t time NOT NULL,
+v varchar(1) NOT NULL,
+u varchar(1) NOT NULL,
+INDEX idx (v)
+) COLLATE=latin1_bin;
+INSERT INTO t3 VALUES
+(3,8,'2008-12-04','00:00:00','v','v'), (3,8,'2009-03-28','00:00:00','f','f'),
+(3,5,'1900-01-01','00:55:47','v','v'), (2,8,'2009-10-02','00:00:00','s','s'),
+(1,8,'1900-01-01','20:51:59','a','a'), (0,6,'2008-06-04','09:47:27','p','p'),
+(8,7,'2009-01-13','21:58:29','z','z'), (5,2,'1900-01-01','22:45:53','a','a'),
+(9,5,'2008-01-28','14:06:48','h','h'), (5,7,'2004-09-18','22:17:16','h','h'),
+(4,2,'2006-10-14','14:59:37','v','v'), (2,9,'1900-01-01','23:37:40','v','v'),
+(33,142,'2000-11-28','14:14:01','b','b'), (5,3,'2008-04-04','02:54:19','y','y'),
+(1,0,'2002-07-13','06:34:26','v','v'), (9,3,'2003-01-03','18:07:38','m','m'),
+(1,5,'2006-04-02','13:55:23','z','z'), (3,9,'2006-10-19','20:32:28','n','n'),
+(8,1,'2005-06-08','11:57:44','d','d'), (231,107,'2006-12-26','03:10:35','a','a');
+INSERT INTO t3 VALUES
+(103,108,'2008-12-04','00:00:00','a','v'), (103,108,'2009-03-28','00:00:00','b','f'),
+(103,105,'1900-01-01','00:55:47','c','v'), (102,108,'2009-10-02','00:00:00','d','s'),
+(100,108,'1900-01-01','20:51:59','e','a'), (100,106,'2008-06-04','09:47:27','f','p'),
+(108,107,'2009-01-13','21:58:29','g','z'), (105,102,'1900-01-01','22:45:53','h','a'),
+(109,105,'2008-01-28','14:06:48','i','h'), (105,107,'2004-09-18','22:17:16','j','h'),
+(104,102,'2006-10-14','14:59:37','k','v'), (102,109,'1900-01-01','23:37:40','l','v'),
+(1033,1142,'2000-11-28','14:14:01','m','b'), (105,103,'2008-04-04','02:54:19','n','y'),
+(100,100,'2002-07-13','06:34:26','o','v'), (109,103,'2003-01-03','18:07:38','p','m'),
+(100,105,'2006-04-02','13:55:23','q','z'), (103,109,'2006-10-19','20:32:28','s','n'),
+(108,100,'2005-06-08','11:57:44','t','d'), (1231,1107,'2006-12-26','03:10:35','v','a');
+CREATE TABLE t1 SELECT * FROM t3;
+DELETE FROM t1 WHERE i > 8;
+CREATE TABLE t2 SELECT * FROM t3;
+DELETE FROM t2 WHERE j > 10;
+EXPLAIN
+SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3
+WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 16
+1 SIMPLE t2 ALL NULL NULL NULL NULL 18 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 hash_ALL idx #hash#idx 3 test.t2.u 40 Using where; Using join buffer (flat, BNLH join)
+SELECT t1.i, t1.d, t1.v, t2.i, t2.d, t2.t, t2.v FROM t1,t2,t3
+WHERE t3.u <='a' AND t2.j < 5 AND t3.v = t2.u;
+i d v i d t v
+0 2008-06-04 p 1 2002-07-13 06:34:26 v
+0 2008-06-04 p 4 2006-10-14 14:59:37 v
+0 2008-06-04 p 5 1900-01-01 22:45:53 a
+0 2008-06-04 p 5 1900-01-01 22:45:53 a
+0 2008-06-04 p 5 1900-01-01 22:45:53 a
+1 1900-01-01 a 1 2002-07-13 06:34:26 v
+1 1900-01-01 a 4 2006-10-14 14:59:37 v
+1 1900-01-01 a 5 1900-01-01 22:45:53 a
+1 1900-01-01 a 5 1900-01-01 22:45:53 a
+1 1900-01-01 a 5 1900-01-01 22:45:53 a
+1 2002-07-13 v 1 2002-07-13 06:34:26 v
+1 2002-07-13 v 4 2006-10-14 14:59:37 v
+1 2002-07-13 v 5 1900-01-01 22:45:53 a
+1 2002-07-13 v 5 1900-01-01 22:45:53 a
+1 2002-07-13 v 5 1900-01-01 22:45:53 a
+1 2006-04-02 z 1 2002-07-13 06:34:26 v
+1 2006-04-02 z 4 2006-10-14 14:59:37 v
+1 2006-04-02 z 5 1900-01-01 22:45:53 a
+1 2006-04-02 z 5 1900-01-01 22:45:53 a
+1 2006-04-02 z 5 1900-01-01 22:45:53 a
+2 1900-01-01 v 1 2002-07-13 06:34:26 v
+2 1900-01-01 v 4 2006-10-14 14:59:37 v
+2 1900-01-01 v 5 1900-01-01 22:45:53 a
+2 1900-01-01 v 5 1900-01-01 22:45:53 a
+2 1900-01-01 v 5 1900-01-01 22:45:53 a
+2 2009-10-02 s 1 2002-07-13 06:34:26 v
+2 2009-10-02 s 4 2006-10-14 14:59:37 v
+2 2009-10-02 s 5 1900-01-01 22:45:53 a
+2 2009-10-02 s 5 1900-01-01 22:45:53 a
+2 2009-10-02 s 5 1900-01-01 22:45:53 a
+3 1900-01-01 v 1 2002-07-13 06:34:26 v
+3 1900-01-01 v 4 2006-10-14 14:59:37 v
+3 1900-01-01 v 5 1900-01-01 22:45:53 a
+3 1900-01-01 v 5 1900-01-01 22:45:53 a
+3 1900-01-01 v 5 1900-01-01 22:45:53 a
+3 2006-10-19 n 1 2002-07-13 06:34:26 v
+3 2006-10-19 n 4 2006-10-14 14:59:37 v
+3 2006-10-19 n 5 1900-01-01 22:45:53 a
+3 2006-10-19 n 5 1900-01-01 22:45:53 a
+3 2006-10-19 n 5 1900-01-01 22:45:53 a
+3 2008-12-04 v 1 2002-07-13 06:34:26 v
+3 2008-12-04 v 4 2006-10-14 14:59:37 v
+3 2008-12-04 v 5 1900-01-01 22:45:53 a
+3 2008-12-04 v 5 1900-01-01 22:45:53 a
+3 2008-12-04 v 5 1900-01-01 22:45:53 a
+3 2009-03-28 f 1 2002-07-13 06:34:26 v
+3 2009-03-28 f 4 2006-10-14 14:59:37 v
+3 2009-03-28 f 5 1900-01-01 22:45:53 a
+3 2009-03-28 f 5 1900-01-01 22:45:53 a
+3 2009-03-28 f 5 1900-01-01 22:45:53 a
+4 2006-10-14 v 1 2002-07-13 06:34:26 v
+4 2006-10-14 v 4 2006-10-14 14:59:37 v
+4 2006-10-14 v 5 1900-01-01 22:45:53 a
+4 2006-10-14 v 5 1900-01-01 22:45:53 a
+4 2006-10-14 v 5 1900-01-01 22:45:53 a
+5 1900-01-01 a 1 2002-07-13 06:34:26 v
+5 1900-01-01 a 4 2006-10-14 14:59:37 v
+5 1900-01-01 a 5 1900-01-01 22:45:53 a
+5 1900-01-01 a 5 1900-01-01 22:45:53 a
+5 1900-01-01 a 5 1900-01-01 22:45:53 a
+5 2004-09-18 h 1 2002-07-13 06:34:26 v
+5 2004-09-18 h 4 2006-10-14 14:59:37 v
+5 2004-09-18 h 5 1900-01-01 22:45:53 a
+5 2004-09-18 h 5 1900-01-01 22:45:53 a
+5 2004-09-18 h 5 1900-01-01 22:45:53 a
+5 2008-04-04 y 1 2002-07-13 06:34:26 v
+5 2008-04-04 y 4 2006-10-14 14:59:37 v
+5 2008-04-04 y 5 1900-01-01 22:45:53 a
+5 2008-04-04 y 5 1900-01-01 22:45:53 a
+5 2008-04-04 y 5 1900-01-01 22:45:53 a
+8 2005-06-08 d 1 2002-07-13 06:34:26 v
+8 2005-06-08 d 4 2006-10-14 14:59:37 v
+8 2005-06-08 d 5 1900-01-01 22:45:53 a
+8 2005-06-08 d 5 1900-01-01 22:45:53 a
+8 2005-06-08 d 5 1900-01-01 22:45:53 a
+8 2009-01-13 z 1 2002-07-13 06:34:26 v
+8 2009-01-13 z 4 2006-10-14 14:59:37 v
+8 2009-01-13 z 5 1900-01-01 22:45:53 a
+8 2009-01-13 z 5 1900-01-01 22:45:53 a
+8 2009-01-13 z 5 1900-01-01 22:45:53 a
+DROP TABLE t1,t2,t3;
+SET SESSION join_cache_level=@save_join_cache_level;
+SET SESSION join_buffer_size=@save_join_buffer_size;
+#
+# Bug #664508: 'Simple' GROUP BY + ORDER BY
+# when join buffers are used
+#
+CREATE TABLE t1 (
+pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
+PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2 (v,i)
+) COLLATE latin1_bin;
+INSERT INTO t1 VALUES
+(10,8,'v'), (11,8,'f'), (13,8,'s'), (14,8,'a'),
+(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'),
+(25,3,'m'), (26,5,'a'), (27,9,'n'), (28,1,'d'), (29,107,'a');
+INSERT INTO t1 VALUES
+(110,8,'x'), (111,8,'y'), (112,5,'v'), (113,8,'z'), (114,8,'i'),
+(115,6,'j'), (116,7,'t'), (117,2,'b'), (118,5,'j'), (119,7,'w'),
+(125,3,'q'), (126,5,'o'), (127,9,'n'), (128,1,'e'), (129,107,'c');
+INSERT INTO t1 VALUES
+(210,8,'b'), (211,8,'c'), (212,5,'d'), (213,8,'e'), (214,8,'g'),
+(215,6,'f'), (216,7,'h'), (217,2,'i'), (218,5,'j'), (219,7,'k'),
+(225,3,'l'), (226,5,'m'), (227,9,'n'), (228,1,'o'), (229,107,'p');
+CREATE TABLE t2 (
+pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
+PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i)
+) COLLATE latin1_bin;
+INSERT INTO t2 VALUES
+(10,8,'v'), (11,8,'f'), (12,5,'v'), (13,8,'s'), (14,8,'a'),
+(15,6,'p'), (16,7,'z'), (17,2,'a'), (18,5,'h'), (19,7,'h'),
+(20,2,'v'), (21,9,'v'), (22,142,'b'), (23,3,'y'), (24,0,'v'),
+(25,3,'m'), (26,5,'b'), (27,9,'n'), (28,1,'d'), (29,107,'a');
+CREATE TABLE t3 (
+pk int NOT NULL, i int NOT NULL, v varchar(1) NOT NULL,
+PRIMARY KEY (pk), INDEX idx1(i), INDEX idx2(v,i)
+) COLLATE latin1_bin;
+INSERT INTO t3 VALUES
+(1,9,'x'), (2,5,'g'), (3,1,'o'), (4,0,'g'), (5,1,'v'),
+(6,190,'m'), (7,6,'x'), (8,3,'c'), (9,4,'z'), (10,3,'i'),
+(11,186,'x'), (12,1,'g'), (13,8,'q'), (14,226,'m'), (15,133,'p'),
+(16,6,'e'), (17,3,'t'), (18,8,'j'), (19,5,'h'), (20,7,'w');
+SET SESSION join_cache_level=1;
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where
+1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where
+1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+SET SESSION join_cache_level=6;
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 eq_ref PRIMARY,idx2 PRIMARY 4 test.t2.i 1 Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
+1 SIMPLE t1 ref idx2 idx2 3 test.t3.v 5 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+SET SESSION join_cache_level=4;
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join)
+SELECT t2.v FROM t1, t2, t3
+WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+EXPLAIN
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 index idx1 idx2 7 NULL 20 Using index; Using temporary; Using filesort
+1 SIMPLE t3 hash_ALL PRIMARY,idx2 #hash#PRIMARY 4 test.t2.i 20 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE t1 hash_ALL idx2 #hash#idx2 3 test.t3.v 44 Using where; Using join buffer (incremental, BNLH join)
+SELECT t2.v FROM t1, t2, t3
+WHERE t2.v <> t3.v AND t3.pk = t2.i AND t1.v = t3.v AND t1.pk*2<100
+GROUP BY t2.v ORDER BY t1.pk,t2.v;
+v
+b
+h
+n
+v
+p
+DROP TABLE t1,t2,t3;
+SET SESSION join_cache_level=@save_join_cache_level;
+#
+# Bug #668290: hash join with non-binary collations
+#
+CREATE TABLE t1 (
+i int DEFAULT NULL,
+cl varchar(10) CHARACTER SET latin1 DEFAULT NULL,
+cu varchar(10) CHARACTER SET utf8 DEFAULT NULL,
+INDEX cl (cl),
+INDEX cu (cu)
+);
+INSERT INTO t1 VALUES
+(650903552,'cmxffkpsel','z'), (535298048,'tvtjrcmxff','y'),
+(1626865664,'when','for'), (39649280,'rcvljitvtj','ercvljitvt'),
+(792068096,'ttercvljit','jttercvlji');
+INSERT INTO t1 SELECT * FROM t1;
+CREATE TABLE t2 (
+cu varchar(10) CHARACTER SET utf8 DEFAULT NULL,
+i int DEFAULT NULL,
+cl varchar(10) CHARACTER SET latin1 DEFAULT NULL,
+INDEX cu (cu),
+INDEX cl (cl)
+);
+INSERT INTO t2 VALUES
+('g',7,'like'), ('fujttercvl',6,'y'),
+('s',2,'e'), ('didn\'t',0,'v'),
+ ('gvdrodpedk',8,'chogvdrodp'), ('jichogvdro',7,'will');
+EXPLAIN
+SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 6
+1 SIMPLE t1 ref cu cu 33 func 2 Using where; Using index
+SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
+i
+6
+6
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 6
+1 SIMPLE t1 hash_index cu #hash#cu:cu 33:33 func 10 Using where; Using index; Using join buffer (flat, BNLH join)
+SELECT t2.i FROM t1,t2 WHERE t1.cu = t2.cl ;
+i
+6
+6
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #669382: hash join using a ref with constant key parts
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES
+(9), (11), (7), (8), (4), (1), (12), (3), (5);
+INSERT INTO t1 SELECT * FROM t1;
+INSERT INTO t1 SELECT * FROM t1;
+CREATE TABLE t2 (a int, b int, c int, INDEX idx (a,b));
+INSERT INTO t2 VALUES
+(8, 80, 800), (1, 10, 100), (1, 11, 101), (3, 30, 300),
+(1, 12, 102), (8, 81, 801), (7, 70, 700), (12, 120, 1200),
+(8, 82, 802), (1, 13, 103), (1, 14, 104), (3, 31, 301),
+(1, 15, 105), (8, 83, 803), (7, 71, 701);
+SET SESSION join_cache_level = 4;
+SET SESSION join_buffer_size = 256;
+EXPLAIN
+SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL idx NULL NULL NULL 15 Using where
+1 SIMPLE t1 hash_ALL NULL #hash#$hj 5 test.t2.a 36 Using where; Using join buffer (flat, BNLH join)
+SELECT t1.a, t2.c FROM t1,t2 WHERE t1.a=t2.a AND t2.b=99;
+a c
+SET SESSION join_cache_level=@save_join_cache_level;
+SET SESSION join_buffer_size=@save_join_buffer_size;
+DROP TABLE t1,t2;
+#
+# Bug #671901: hash join using a ref to a varchar field
+#
+CREATE TABLE t1 (
+v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
+i int DEFAULT NULL
+);
+INSERT INTO t1 VALUES
+('k',8), ('abcdefjh',-575340544), ('f',77), ('because', 2), ('f',-517472256),
+('abcdefjhj',5), ('z',7);
+CREATE TABLE t2 (
+v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
+i int DEFAULT NULL,
+INDEX idx (v)
+);
+INSERT INTO t2 VALUES
+('did',5), ('was',-1631322112), ('are',3), ('abcdefjhjk',3),
+('abcdefjhjk',4), ('tell',-824573952), ('t',0),('v',-1711013888),
+('abcdefjhjk',1015414784), ('or',4), ('now',0), ('abcdefjhjk',-32702464),
+('abcdefjhjk',4), ('time',1078394880), ('f',4), ('m',-1845559296),
+('ff', 5), ('abcdefjhjk',-1074397184);
+INSERT INTO t2 VALUES
+('dig',5), ('were',-1631322112), ('is',3), ('abcdefjhjl',3),
+('abcdefjh',4), ('told',-824573952), ('tt',0),('vv',-1711013888),
+('abcdefjhjj',1015414784), ('and',4), ('here',0), ('abcdefjhjm',-32702464),
+('abcdefjhji',4), ('space',1078394880), ('fs',4), ('mn',-1845559296),
+('fq', 5), ('abcdefjhjp',-1074397184);
+EXPLAIN
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
+1 SIMPLE t2 ref idx idx 13 test.t1.v 3
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
+v i
+abcdefjh 4
+f 4
+f 4
+EXPLAIN
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7
+1 SIMPLE t2 ref idx idx 13 func 3 Using index condition
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
+v i
+f 5
+f 5
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7 Using where
+1 SIMPLE t2 hash_ALL idx #hash#idx 13 test.t1.v 36 Using join buffer (flat, BNLH join)
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = t1.v;
+v i
+f 4
+f 4
+abcdefjh 4
+EXPLAIN
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 7
+1 SIMPLE t2 hash_ALL idx #hash#idx 13 func 36 Using where; Using join buffer (flat, BNLH join)
+SELECT t1.v,t2.i FROM t1,t2 WHERE t2.v = concat(t1.v, t1.v);
+v i
+f 5
+f 5
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+# Bug #672497: 3 way join with tiny incremental join buffer with
+# and a ref access from the first table
+#
+CREATE TABLE t1 (
+pk int PRIMARY KEY,
+v varchar(10) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
+INDEX idx (v)
+);
+INSERT INTO t1 VALUES
+(1,'abcdefjhjk'), (2,'i'),(3,'abcdefjhjk'), (4,'well'), (5,'abcdefjhjk'),
+(6,'abcdefjhjk'), (7,'that');
+CREATE TABLE t2 (
+pk int PRIMARY KEY,
+i int DEFAULT NULL,
+v varchar(1000) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
+INDEX idx (v)
+);
+INSERT INTO t2 VALUES
+(1,6,'yes'), (2,NULL,'will'), (3,NULL,'o'), (4,NULL,'k'), (5,NULL,'she'),
+(6,-1450835968,'abcdefjhjkl'), (7,-975831040,'abcdefjhjkl'), (8,NULL,'z'),
+(10,-343932928,'t'),
+(11,6,'yes'), (12,NULL,'will'), (13,NULL,'o'), (14,NULL,'k'), (15,NULL,'she'),
+(16,-1450835968,'abcdefjhjkl'), (17,-975831040,'abcdefjhjkl'), (18,NULL,'z'),
+(19,-343932928,'t');
+INSERT INTO t2 VALUES
+(101,6,'yes'), (102,NULL,'will'), (103,NULL,'o'), (104,NULL,'k'), (105,NULL,'she'),
+(106,-1450835968,'abcdefjhjkl'), (107,-975831040,'abcdefjhjkl'), (108,NULL,'z'),
+(100,-343932928,'t'),
+(111,6,'yes'), (112,NULL,'will'), (113,NULL,'o'), (114,NULL,'k'), (115,NULL,'she'),
+(116,-1450835968,'abcdefjhjkl'), (117,-975831040,'abcdefjhjkl'), (118,NULL,'z'),
+(119,-343932928,'t');
+CREATE TABLE t3 (
+pk int NOT NULL PRIMARY KEY,
+i int,
+v varchar(1024) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+INDEX idx (v(333))
+);
+INSERT INTO t3 VALUES
+(1,7,'abcdefjhjkl'),(2,6,'y'), (3,NULL,'to'),(4,7,'n'),(5,7,'look'), (6,NULL,'all'),
+(7,1443168256,'c'), (8,1427046400,'right'),
+(11,7,'abcdefjhjkl'), (12,6,'y'), (13,NULL,'to'), (14,7,'n'), (15,7,'look'),
+(16,NULL,'all'), (17,1443168256,'c'), (18,1427046400,'right'),
+(21,7,'abcdefjhjkl'), (22,6,'y'), (23,NULL,'to'), (24,7,'n'), (25,7,'look'),
+(26,NULL,'all'), (27,1443168256,'c'), (28,1427046400,'right'),
+(31,7,'abcdefjhjkl'), (32,6,'y'), (33,NULL,'to'), (34,7,'n'), (35,7,'look'),
+(36,NULL,'all'), (37,1443168256,'c'), (38,1427046400,'right');
+INSERT INTO t3 VALUES
+(101,7,'abcdefjhjkl'),(102,6,'y'), (103,NULL,'to'),(104,7,'n'),(105,7,'look'),
+(106,NULL,'all'), (107,1443168256,'c'), (108,1427046400,'right'),
+(111,7,'abcdefjhjkl'), (112,6,'y'), (113,NULL,'to'), (114,7,'n'), (115,7,'look'),
+(116,NULL,'all'), (117,1443168256,'c'), (118,1427046400,'right'),
+(121,7,'abcdefjhjkl'), (122,6,'y'), (123,NULL,'to'), (124,7,'n'), (125,7,'look'),
+(126,NULL,'all'), (127,1443168256,'c'), (128,1427046400,'right'),
+(131,7,'abcdefjhjkl'), (132,6,'y'), (133,NULL,'to'), (134,7,'n'), (135,7,'look'),
+(136,NULL,'all'), (137,1443168256,'c'), (138,1427046400,'right');
+SET SESSION join_buffer_size = 256;
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT t3.i FROM t1,t2,t3
+WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index idx idx 13 NULL 7 Using where; Using index
+1 SIMPLE t2 hash_ALL idx #hash#idx 1003 test.t1.v 36 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE t3 hash_ALL idx #hash#idx 1002 func 64 Using where; Using join buffer (incremental, BNLH join)
+SELECT t3.i FROM t1,t2,t3
+WHERE t1.v = t2.v AND t3.v = t1.v AND t2.i <> 0;
+i
+SET SESSION join_cache_level=@save_join_cache_level;
+SET SESSION join_buffer_size=@save_join_buffer_size;
+DROP TABLE t1,t2,t3;
+#
+# Bug #672551: hash join over a long varchar field
+#
+CREATE TABLE t1 (
+pk int PRIMARY KEY,
+a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL,
+INDEX idx (a)
+);
+INSERT INTO t1 VALUES (2, 'aa'), (5, 'ccccccc'), (3, 'bb');
+CREATE TABLE t2(
+pk int PRIMARY KEY,
+a varchar(512) CHARSET latin1 COLLATE latin1_bin DEFAULT NULL,
+INDEX idx (a)
+);
+INSERT INTO t2 VALUES
+(10, 'a'), (20, 'c'), (30, 'aa'), (4, 'bb'),
+(11, 'a'), (21, 'c'), (31, 'aa'), (41, 'cc'),
+(12, 'a'), (22, 'c'), (32, 'bb'), (42, 'aa');
+INSERT INTO t2 VALUES
+(110, 'a'), (120, 'c'), (130, 'aa'), (14, 'bb'),
+(111, 'a'), (121, 'c'), (131, 'aa'), (141, 'cc'),
+(112, 'a'), (122, 'c'), (132, 'bb'), (142, 'aa');
+SELECT * FROM t1,t2 WHERE t2.a=t1.a;
+pk a pk a
+2 aa 30 aa
+2 aa 31 aa
+2 aa 42 aa
+2 aa 130 aa
+2 aa 131 aa
+2 aa 142 aa
+3 bb 4 bb
+3 bb 32 bb
+3 bb 14 bb
+3 bb 132 bb
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE t2.a=t1.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL idx NULL NULL NULL 3 Using where
+1 SIMPLE t2 hash_ALL idx #hash#idx 515 test.t1.a 24 Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE t2.a=t1.a;
+pk a pk a
+2 aa 30 aa
+3 bb 4 bb
+2 aa 31 aa
+3 bb 32 bb
+2 aa 42 aa
+2 aa 130 aa
+3 bb 14 bb
+2 aa 131 aa
+3 bb 132 bb
+2 aa 142 aa
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #674431: nested outer join when join_cache_level is set to 7
+#
+CREATE TABLE t1 (a int, b varchar(32)) ;
+INSERT INTO t1 VALUES (5,'h'), (NULL,'j');
+CREATE TABLE t2 (a int, b varchar(32), c int) ;
+INSERT INTO t2 VALUES (5,'h',100), (NULL,'j',200);
+CREATE TABLE t3 (a int, b varchar(32), INDEX idx(b));
+INSERT INTO t3 VALUES (77,'h'), (88,'g');
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 7;
+SELECT t3.a
+FROM t1 LEFT JOIN
+(t2 LEFT OUTER JOIN t3 ON t2.b = t3.b) ON t2.a = t1.b
+WHERE t3.a BETWEEN 3 AND 11 OR t1.a <= t2.c;
+a
+Warnings:
+Warning 1292 Truncated incorrect INTEGER value: 'h'
+Warning 1292 Truncated incorrect INTEGER value: 'j'
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3;
+#
+# Bug #52540: nested outer join when join_cache_level is set to 3
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (2);
+CREATE TABLE t2 (a varchar(10));
+INSERT INTO t2 VALUES ('f'),('x');
+CREATE TABLE t3 (pk int(11) PRIMARY KEY);
+INSERT INTO t3 VALUES (2);
+CREATE TABLE t4 (a varchar(10));
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 3;
+SELECT *
+FROM t2 LEFT JOIN
+((t1 JOIN t3 ON t1.a = t3.pk) LEFT JOIN t4 ON 1) ON 1;
+a a pk a
+f 2 2 NULL
+x 2 2 NULL
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug #674423: outer join with ON expression over only outer tables
+#
+CREATE TABLE t1 (a int) ;
+INSERT INTO t1 VALUES ('9');
+CREATE TABLE t2 (pk int, a int) ;
+INSERT INTO t2 VALUES ('9',NULL), ('1',NULL);
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 0;
+EXPLAIN
+SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2
+1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where
+SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <>0 OR t2.pk < 9;
+pk a a
+1 NULL NULL
+SET SESSION join_cache_level = 1;
+EXPLAIN
+SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2
+1 SIMPLE t1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+SELECT * FROM t2 LEFT JOIN t1 ON t2.a <> 0 WHERE t1.a <> 0 OR t2.pk < 9;
+pk a a
+1 NULL NULL
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #675095: nested outer join using join buffer
+#
+CREATE TABLE t1 (pk int, a1 int) ;
+INSERT IGNORE INTO t1 VALUES (2,NULL), (8,0);
+CREATE TABLE t2 (pk int, a2 int, c2 int, d2 int) ;
+INSERT IGNORE INTO t2 VALUES (9,0,0,2), (1,0,0,7);
+CREATE TABLE t3 (pk int, a3 int, c3 int, d3 int) ;
+INSERT IGNORE INTO t3 VALUES (9,0,0,2), (1,0,0,7);
+CREATE TABLE t4 (pk int, a4 int, INDEX idx(a4)) ;
+INSERT IGNORE INTO t4 VALUES (2,NULL), (8,0);
+INSERT IGNORE INTO t4 VALUES (12,10), (18,20);
+INSERT IGNORE INTO t4 VALUES (22,11), (28,21);
+INSERT IGNORE INTO t4 VALUES (32,12), (38,22);
+CREATE TABLE t5 (pk int, a5 int) ;
+INSERT IGNORE INTO t5 VALUES (2,0), (8,0);
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 0;
+EXPLAIN EXTENDED
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
+1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
+1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where
+1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where
+Warnings:
+Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
+8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
+SET SESSION join_cache_level = 2;
+EXPLAIN EXTENDED
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where
+1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
+8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
+SET SESSION join_cache_level = 1;
+EXPLAIN EXTENDED
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using where
+1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where
+1 SIMPLE t4 ref idx idx 5 test.t1.a1 2 100.00 Using where
+1 SIMPLE t5 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
+Warnings:
+Note 1003 select `test`.`t1`.`pk` AS `pk`,`test`.`t1`.`a1` AS `a1`,`test`.`t2`.`pk` AS `pk`,`test`.`t2`.`a2` AS `a2`,`test`.`t2`.`c2` AS `c2`,`test`.`t2`.`d2` AS `d2`,`test`.`t3`.`pk` AS `pk`,`test`.`t3`.`a3` AS `a3`,`test`.`t3`.`c3` AS `c3`,`test`.`t3`.`d3` AS `d3`,`test`.`t4`.`pk` AS `pk`,`test`.`t4`.`a4` AS `a4`,`test`.`t5`.`pk` AS `pk`,`test`.`t5`.`a5` AS `a5` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t2`.`d2` = `test`.`t1`.`pk` and `test`.`t3`.`a3` = `test`.`t2`.`c2`) left join `test`.`t4` on(`test`.`t4`.`a4` = `test`.`t1`.`a1` and `test`.`t1`.`a1` is not null) left join `test`.`t5` on(`test`.`t5`.`a5` = `test`.`t3`.`a3`) where 1
+SELECT *
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.c2 = t3.a3) ON t1.pk = t2.d2)
+LEFT JOIN t4 ON t1.a1 = t4.a4) LEFT JOIN t5 ON t3.a3 = t5.a5;
+pk a1 pk a2 c2 d2 pk a3 c3 d3 pk a4 pk a5
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 2 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 2 0
+2 NULL 9 0 0 2 9 0 0 2 NULL NULL 8 0
+2 NULL 9 0 0 2 1 0 0 7 NULL NULL 8 0
+8 0 NULL NULL NULL NULL NULL NULL NULL NULL 8 0 NULL NULL
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4,t5;
+#
+# Bug #675516: nested outer join with 3 tables in the nest
+# using BNL + BNLH
+#
+CREATE TABLE t1 (a1 int, b1 int, c1 int) ;
+INSERT INTO t1 VALUES (7,8,0), (6,4,0);
+CREATE TABLE t2 (a2 int) ;
+INSERT INTO t2 VALUES (5);
+CREATE TABLE t3 (a3 int, b3 int, c3 int, PRIMARY KEY (b3)) ;
+INSERT INTO t3 VALUES (2,5,0);
+CREATE TABLE t4 (a4 int, b4 int, c4 int) ;
+INSERT INTO t4 VALUES (7,8,0);
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT * FROM
+t1 LEFT JOIN
+((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
+WHERE t3.a3 IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t3 hash_ALL PRIMARY #hash#$hj 5 test.t1.c1 1 Using where; Using join buffer (flat, BNLH join)
+1 SIMPLE t2 hash_ALL NULL #hash#$hj 5 test.t3.b3 1 Using where; Using join buffer (incremental, BNLH join)
+1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+SELECT * FROM
+t1 LEFT JOIN
+((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
+WHERE t3.a3 IS NULL;
+a1 b1 c1 a2 a3 b3 c3 a4 b4 c4
+SET SESSION join_cache_level = 0;
+EXPLAIN
+SELECT * FROM
+t1 LEFT JOIN
+((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
+WHERE t3.a3 IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
+1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
+SELECT * FROM
+t1 LEFT JOIN
+((t2 JOIN t3 ON t2.a2 = t3.b3) JOIN t4 ON t4.b4 <> 0) ON t1.c1 = t3.c3
+WHERE t3.a3 IS NULL;
+a1 b1 c1 a2 a3 b3 c3 a4 b4 c4
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug #660963: nested outer join with join_cache_level set to 5
+#
+CREATE TABLE t1 (a1 int) ;
+INSERT INTO t1 VALUES (0),(0);
+CREATE TABLE t2 (a2 int, b2 int, PRIMARY KEY (a2)) ;
+INSERT INTO t2 VALUES (2,1);
+CREATE TABLE t3 (a3 int, b3 int, PRIMARY KEY (a3)) ;
+INSERT INTO t3 VALUES (2,1);
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 6;
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
+a1 a2 b2 a3 b3
+0 2 1 2 1
+0 2 1 2 1
+SET SESSION join_cache_level = 5;
+EXPLAIN
+SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 hash_ALL PRIMARY #hash#PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BNLH join)
+SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
+a1 a2 b2 a3 b3
+0 2 1 2 1
+0 2 1 2 1
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3;
+#
+# Bug #675922: incremental buffer for BKA with access from previous
+# buffers from non-nullable columns whose values may be null
+#
+CREATE TABLE t1 (a1 varchar(32)) ;
+INSERT INTO t1 VALUES ('s'),('k');
+CREATE TABLE t2 (a2 int PRIMARY KEY, b2 varchar(32)) ;
+INSERT INTO t2 VALUES (7,'s');
+CREATE TABLE t3 (a3 int PRIMARY KEY, b3 varchar(32)) ;
+INSERT INTO t3 VALUES (7,'s');
+CREATE TABLE t4 (a4 int) ;
+INSERT INTO t4 VALUES (9);
+CREATE TABLE t5(a5 int PRIMARY KEY, b5 int) ;
+INSERT INTO t5 VALUES (7,0);
+SET SESSION optimizer_switch = 'outer_join_with_cache=on';
+SET SESSION join_cache_level = 0;
+EXPLAIN
+SELECT t4.a4, t5.b5
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
+LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
+1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
+1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
+SELECT t4.a4, t5.b5
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
+LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
+a4 b5
+9 0
+9 NULL
+SET SESSION join_cache_level = 6;
+EXPLAIN
+SELECT t4.a4, t5.b5
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
+LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
+1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT t4.a4, t5.b5
+FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
+LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
+a4 b5
+9 0
+9 NULL
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2,t3,t4,t5;
+#
+# Bug #670380: hash join for non-binary collation
+#
+CREATE TABLE t1 (pk int PRIMARY KEY, a varchar(32));
+CREATE TABLE t2 (pk int PRIMARY KEY, a varchar(32), INDEX idx(a));
+INSERT INTO t1 VALUES
+(10,'AAA'), (20,'BBBB'), (30,'Cc'), (40,'DD'), (50,'ee');
+INSERT INTO t2 VALUES
+(1,'Bbbb'), (2,'BBB'), (3,'bbbb'), (4,'AaA'), (5,'CC'),
+(6,'cC'), (7,'CCC'), (8,'AAA'), (9,'bBbB'), (10,'aaaa'),
+(11,'a'), (12,'dd'), (13,'EE'), (14,'ee'), (15,'D'),
+(101,'Bbbb'), (102,'BBB'), (103,'bbbb'), (104,'AaA'), (105,'CC'),
+(106,'cC'), (107,'CCC'), (108,'AAA'), (109,'bBbB'), (110,'aaaa'),
+(111,'a'), (112,'dd'), (113,'EE'), (114,'ee'), (115,'D');
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where
+1 SIMPLE t2 hash_ALL idx #hash#idx 35 test.t1.a 30 Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE t1.a=t2.a;
+pk a pk a
+20 BBBB 1 Bbbb
+20 BBBB 3 bbbb
+10 AAA 4 AaA
+30 Cc 5 CC
+30 Cc 6 cC
+10 AAA 8 AAA
+20 BBBB 9 bBbB
+40 DD 12 dd
+50 ee 13 EE
+50 ee 14 ee
+20 BBBB 101 Bbbb
+20 BBBB 103 bbbb
+10 AAA 104 AaA
+30 Cc 105 CC
+30 Cc 106 cC
+10 AAA 108 AAA
+20 BBBB 109 bBbB
+40 DD 112 dd
+50 ee 113 EE
+50 ee 114 ee
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #694092: incorrect detection of index only pushdown conditions
+#
+CREATE TABLE t1 (
+f1 varchar(10), f3 int(11), PRIMARY KEY (f3)
+);
+INSERT INTO t1 VALUES ('y',1),('or',5);
+CREATE TABLE t2 (
+f3 int(11), f2 varchar(1024), f4 varchar(10), PRIMARY KEY (f3)
+);
+INSERT INTO t2 VALUES (6,'RPOYT','y'),(10,'JINQE','m');
+SET SESSION join_cache_level = 1;
+SET SESSION optimizer_switch = 'index_condition_pushdown=off';
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan
+1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
+SELECT * FROM t1,t2
+WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
+f1 f3 f3 f2 f4
+SET SESSION optimizer_switch = 'index_condition_pushdown=on';
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Rowid-ordered scan
+1 SIMPLE t2 range PRIMARY PRIMARY 4 NULL 2 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
+SELECT * FROM t1,t2
+WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
+f1 f3 f3 f2 f4
+SET SESSION join_cache_level=@save_join_cache_level;
+SET SESSION optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2;
+CREATE TABLE t1 (f1 int, f2 varchar(10), KEY (f1), KEY (f2)) ;
+INSERT INTO t1 VALUES
+(4,'e'), (891879424,'l'), (-243400704,'ectlyqupbk'), (1851981824,'of'),
+(-1495203840,'you'), (4,'no'), (-1436942336,'c'), (891420672,'DQQYO'),
+(608698368,'qergldqmec'), (1,'x');
+CREATE TABLE t2 (f3 varchar(64), KEY (f3));
+INSERT INTO t2 VALUES
+('d'), ('UALLN'), ('d'), ('z'), ('r'), ('YVAKV'), ('d'), ('TNGZK'), ('e'),
+('xucupaxdyythsgiw'), ('why'), ('ttugkxucupaxdyyt'), ('l'), ('LHTKN'),
+('d'), ('o'), ('v'), ('KGLCJ'), ('your');
+SET SESSION optimizer_switch='index_merge_sort_intersection=off';
+SET SESSION optimizer_switch = 'index_condition_pushdown=off';
+EXPLAIN SELECT * FROM t1,t2
+WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0, 100) ORDER BY t1.f2 LIMIT 1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range f1,f2 f2 13 NULL 10 Using where
+1 SIMPLE t2 ref f3 f3 67 test.t1.f2 2 Using where; Using index
+SELECT * FROM t1,t2
+WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
+f1 f2 f3
+SET SESSION optimizer_switch=@local_optimizer_switch;
+SET SESSION optimizer_switch = 'index_condition_pushdown=on';
+EXPLAIN SELECT * FROM t1,t2
+WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range f1,f2 f2 13 NULL 10 Using where
+1 SIMPLE t2 ref f3 f3 67 test.t1.f2 2 Using where; Using index
+SELECT * FROM t1,t2
+WHERE t2.f3 = t1.f2 AND t1.f1 IN (9, 0 ,100) ORDER BY t1.f2 LIMIT 1;
+f1 f2 f3
+SET SESSION optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2;
+#
+# Bug #694443: hash join using IS NULL the an equi-join condition
+#
+CREATE TABLE t1 (a int PRIMARY KEY);
+INSERT INTO t1 VALUES
+(7), (4), (9), (1), (3), (8), (2);
+CREATE TABLE t2 (a int, b int, INDEX idx (a));
+INSERT INTO t2 VALUES
+(NULL,10), (4,80), (7,70), (6,11), (7,90), (NULL,40),
+(4,77), (4,50), (NULL,41), (7,99), (7,88), (8,12),
+(1,21), (4,90), (7,91), (8,22), (6,92), (NULL,42),
+(2,78), (2,51), (1,43), (5,97), (5,89);
+SET SESSION join_cache_level = 1;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Using index
+1 SIMPLE t2 ref idx idx 5 const 4 Using index condition
+SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
+a a b
+1 NULL 10
+1 NULL 40
+1 NULL 41
+1 NULL 42
+2 NULL 10
+2 NULL 40
+2 NULL 41
+2 NULL 42
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where; Using index
+1 SIMPLE t2 hash_range idx #hash#idx:idx 5:5 const 4 Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
+a a b
+1 NULL 10
+2 NULL 10
+1 NULL 40
+2 NULL 40
+1 NULL 41
+2 NULL 41
+1 NULL 42
+2 NULL 42
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #697557: hash join on a varchar field
+#
+CREATE TABLE t1 ( f1 varchar(10) , f2 int(11) , KEY (f1));
+INSERT INTO t1 VALUES ('r',1), ('m',2);
+CREATE TABLE t2 ( f1 varchar(10) , f2 int(11) , KEY (f1));
+INSERT INTO t2 VALUES
+('hgtofubn',1), ('GDOXZ',91), ('n',2), ('fggxgalh',88),
+('hgtofu',1), ('GDO',101), ('n',3), ('fggxga',55),
+('hgtofu',3), ('GDO',33), ('nn',3), ('fggxgarrr',77),
+('jgtofu',3), ('JDO',33), ('mn',3), ('jggxgarrr',77),
+('igtofu',3), ('IDO',33), ('ln',3), ('iggxgarrr',77);
+SET SESSION join_cache_level=3;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL f1 NULL NULL NULL 2 Using where
+1 SIMPLE t2 hash_ALL f1 #hash#f1 13 test.t1.f1 20 Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE t2.f1 = t1.f1;
+f1 f2 f1 f2
+SET SESSION join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# Bug #707827: hash join on varchar column with NULLs
+#
+CREATE TABLE t1 (v varchar(1));
+INSERT INTO t1 VALUES ('o'), ('u');
+CREATE TABLE t2 (a int, v varchar(1), INDEX idx (v)) ;
+INSERT INTO t2 VALUES
+(8,NULL), (10,'b'), (5,'k'), (4,NULL),
+(1,NULL), (11,'u'), (7,NULL), (2,'d'),
+(18,'u'), (11,'b'), (15,'k'), (12,'d'),
+(18,'x'), (11,'y'), (15,'l'), (12,'e');
+SET SESSION join_buffer_size = 256;
+SET SESSION join_cache_level = 4;
+EXPLAIN
+SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t2 hash_ALL idx #hash#idx 4 test.t1.v 16 Using join buffer (flat, BNLH join)
+SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
+a
+11
+18
+SET SESSION join_cache_level = 1;
+EXPLAIN
+SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t2 ref idx idx 4 test.t1.v 2
+SELECT a FROM t1,t2 WHERE t2.v = t1.v ;
+a
+11
+18
+SET SESSION join_cache_level=@save_join_cache_level;
+SET SESSION join_buffer_size=@save_join_buffer_size;
+DROP TABLE t1,t2;
+#
+# Bug #802860: crash on join cache + derived + duplicate_weedout
+#
+SET SESSION optimizer_switch=
+'semijoin=on,materialization=off,firstmatch=off,loosescan=off,derived_with_keys=on';
+CREATE TABLE t1 (a int) ;
+INSERT IGNORE INTO t1 VALUES (0), (1), (0);
+CREATE TABLE t2 (a int) ;
+INSERT IGNORE INTO t2 VALUES (0), (3), (0), (2);
+SET SESSION join_cache_level = 0;
+EXPLAIN
+SELECT * FROM (SELECT DISTINCT * FROM t1) t
+WHERE t.a IN (SELECT t2.a FROM t2);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary
+1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 1 End temporary
+2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary
+SELECT * FROM (SELECT DISTINCT * FROM t1) t
+WHERE t.a IN (SELECT t2.a FROM t2);
+a
+0
+SET SESSION join_cache_level = 1;
+EXPLAIN
+SELECT * FROM (SELECT DISTINCT * FROM t1) t
+WHERE t.a IN (SELECT t2.a FROM t2);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t2 ALL NULL NULL NULL NULL 4 Using where; Start temporary
+1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 1 End temporary
+2 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary
+SELECT * FROM (SELECT DISTINCT * FROM t1) t
+WHERE t.a IN (SELECT t2.a FROM t2);
+a
+0
+DROP TABLE t1, t2;
+SET SESSION join_cache_level=@save_join_cache_level;
+#
+# Bug #887479: join_cache_level=3 + semijoin=on
+#
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (3914,17), (3710,5), (3888,20);
+CREATE TABLE t2 (c int, KEY (c));
+INSERT INTO t2 VALUES (27), (17), (33), (20), (3), (7), (18), (2);
+SET @tmp_optimizer_switch=@@optimizer_switch;
+SET SESSION optimizer_switch='semijoin=on';
+SET SESSION optimizer_switch='semijoin_with_cache=on';
+SET SESSION join_cache_level=1;
+EXPLAIN
+SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
+1 PRIMARY t2 ref c c 5 test.t1.b 2 Using index; Start temporary; End temporary
+SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
+a b
+3914 17
+3888 20
+SET SESSION join_cache_level=3;
+EXPLAIN
+SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 3 Using where
+1 PRIMARY t2 hash_index c #hash#c:c 5:5 test.t1.b 8 Using index; Start temporary; End temporary; Using join buffer (flat, BNLH join)
+SELECT * FROM t1 WHERE (t1.b) IN (SELECT c FROM t2);
+a b
+3914 17
+3888 20
+SET SESSION join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@tmp_optimizer_switch;
+DROP TABLE t1,t2;
+#
+# Bug #899777: join_cache_level=4 + semijoin=on
+#
+CREATE TABLE t1 (a int, b int, c int, UNIQUE INDEX idx (a));
+INSERT INTO t1 VALUES (1,8,6), (2,2,8);
+CREATE TABLE t2 (a int, b int, c int, UNIQUE INDEX idx (a));
+INSERT INTO t2 VALUES (1,8,6), (2,2,8);
+CREATE TABLE t3 (a int, b int, c int, UNIQUE INDEX idx (a));
+INSERT INTO t3 VALUES (1,8,6), (2,2,8);
+CREATE TABLE t4 (a int, b int, c int, UNIQUE INDEX idx (a));
+INSERT INTO t4 VALUES (1,8,6), (2,2,8);
+SET @tmp_optimizer_switch=@@optimizer_switch;
+SET SESSION optimizer_switch='semijoin=on';
+SET SESSION optimizer_switch='semijoin_with_cache=on';
+SET SESSION join_cache_level=1;
+EXPLAIN
+SELECT t1.* FROM t1,t2
+WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
+AND t1.a = 1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 const idx idx 5 const 1
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2
+1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; Using join buffer (flat, BNL join)
+1 PRIMARY t4 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join)
+SELECT t1.* FROM t1,t2
+WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
+AND t1.a = 1;
+a b c
+1 8 6
+SET SESSION join_cache_level=4;
+EXPLAIN
+SELECT t1.* FROM t1,t2
+WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
+AND t1.a = 1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 const idx idx 5 const 1
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where
+1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; Using join buffer (flat, BNLH join)
+1 PRIMARY t4 hash_ALL NULL #hash#$hj 10 const,test.t2.b 2 Using where; End temporary; Using join buffer (incremental, BNLH join)
+SELECT t1.* FROM t1,t2
+WHERE (t1.b,t2.b) IN (SELECT t3.b,t4.b FROM t3,t4 WHERE t4.c=t3.b)
+AND t1.a = 1;
+a b c
+1 8 6
+SET SESSION join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug #899509: an attempt to use hash join with join_cache_level=0
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (8), (7);
+CREATE TABLE t2 (a int);
+INSERT INTO t2 VALUES (8), (7);
+CREATE TABLE t3 (a int);
+INSERT INTO t3 VALUES (8), (7);
+set @@optimizer_switch='semijoin_with_cache=off';
+set @@optimizer_switch='outer_join_with_cache=off';
+set @@optimizer_switch='derived_merge=off,derived_with_keys=off';
+SET join_cache_level=0;
+EXPLAIN
+SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4
+1 PRIMARY <subquery3> eq_ref distinct_key distinct_key 4 func 1
+3 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
+2 DERIVED t1 ALL NULL NULL NULL NULL 2
+2 DERIVED t2 ALL NULL NULL NULL NULL 2
+SELECT * FROM (SELECT t1.* FROM t1, t2) t WHERE t.a IN (SELECT * FROM t3);
+a
+8
+8
+7
+7
+SELECT * FROM ( SELECT ta.* FROM t1 AS ta, t1 ) tb WHERE a IN ( SELECT * FROM t1 );
+a
+8
+8
+7
+7
+SET SESSION join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3;
+#
+# Bug #900469: semijoin + BNLH + ORDER BY
+#
+CREATE TABLE t1 (a int, b int);
+INSERT INTO t1 VALUES (8,10);
+CREATE TABLE t2 (c int, d int);
+INSERT INTO t2 VALUES (8,10);
+INSERT INTO t2 VALUES (9,11);
+CREATE TABLE t3 (c int, d int);
+INSERT INTO t3 VALUES (8,10);
+INSERT INTO t3 VALUES (9,11);
+set @@optimizer_switch='semijoin_with_cache=on';
+set @@optimizer_switch='firstmatch=off';
+SET join_cache_level=1;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2
+1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNL join)
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
+a b c d
+8 10 8 10
+8 10 9 11
+SET join_cache_level=3;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2
+1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c);
+a b c d
+8 10 8 10
+8 10 9 11
+SET join_cache_level=3;
+EXPLAIN
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2
+1 PRIMARY t3 hash_ALL NULL #hash#$hj 5 const 2 Using where; Start temporary; End temporary; Using join buffer (flat, BNLH join)
+SELECT * FROM t1,t2 WHERE b IN (SELECT d FROM t3 WHERE c <= t2.c) ORDER BY a,d;
+a b c d
+8 10 8 10
+8 10 9 11
+SET SESSION join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3;
+#
+# Bug #901478: semijoin + ORDER BY + join_cache_level=4|6
+#
+CREATE TABLE t1 (a char(1));
+INSERT INTO t1 VALUES ('x');
+CREATE TABLE t2 (a int, b int, c int, KEY(a), KEY(b), KEY(c));
+INSERT INTO t2 VALUES
+(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4);
+CREATE TABLE t3 (a CHAR(1));
+INSERT INTO t3 VALUES ('x');
+CREATE TABLE t4 (a int, b int, c int, KEY(b), KEY(c));
+INSERT INTO t4 VALUES
+(9,1,0), (7,2,8), (2,3,5), (4,2,9), (8,3,8), (3,4,1), (5,5,4);
+INSERT INTO t4 VALUES
+(19,11,10), (17,12,18), (12,13,15), (14,12,19),
+(18,13,18), (13,14,11), (15,15,14);
+SET @@optimizer_switch='semijoin=on';
+SET @@optimizer_switch='firstmatch=off';
+SET @@optimizer_switch='mrr=off';
+SET @@optimizer_switch='semijoin_with_cache=off';
+set join_cache_level=1;
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1
+1 PRIMARY t3 system NULL NULL NULL NULL 1
+1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where; Using filesort
+1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+a a b c
+x 4 2 9
+x 5 5 4
+set join_cache_level=4;
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 PRIMARY t3 system NULL NULL NULL NULL 1
+1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where
+1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+a a b c
+x 4 2 9
+x 5 5 4
+SET @@optimizer_switch='semijoin_with_cache=on';
+set join_cache_level=6;
+EXPLAIN
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 system NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 PRIMARY t3 system NULL NULL NULL NULL 1
+1 PRIMARY t2 range a,c a 5 NULL 2 Using index condition; Using where
+1 PRIMARY t4 ref c c 5 test.t2.c 2 Using where; Start temporary; End temporary
+SELECT * FROM t1,t2
+WHERE t2.c IN (SELECT c FROM t3,t4 WHERE t4.a < 10) AND
+t2.a BETWEEN 4 and 5
+ORDER BY t2.b;
+a a b c
+x 4 2 9
+x 5 5 4
+set join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3,t4;
+#
+# Bug#53305 Duplicate weedout + join buffer (join cache --level=7,8)
+#
+create table t1 (uid int, fid int, index(uid));
+insert into t1 values
+(1,1), (1,2), (1,3), (1,4),
+(2,5), (2,6), (2,7), (2,8),
+(3,1), (3,2), (3,9);
+create table t2 (uid int primary key, name varchar(128), index(name));
+insert into t2 values
+(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"),
+(6, "F"), (7, "G"), (8, "H"), (9, "I");
+create table t3 (uid int, fid int, index(uid));
+insert into t3 values
+(1,1), (1,2), (1,3),(1,4),
+(2,5), (2,6), (2,7), (2,8),
+(3,1), (3,2), (3,9);
+set @@optimizer_switch='semijoin=on';
+set @@optimizer_switch='materialization=off';
+set @@optimizer_switch='loosescan=off,firstmatch=off';
+set @@optimizer_switch='mrr_sort_keys=off';
+set join_cache_level=7;
+create table t4 (uid int primary key, name varchar(128), index(name));
+insert into t4 values
+(1, "A"), (2, "B"), (3, "C"), (4, "D"), (5, "E"),
+(6, "F"), (7, "G"), (8, "H"), (9, "I");
+explain select name from t2, t1
+where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid)
+and t2.uid=t1.fid;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t3 ref uid uid 5 const 4 Using where; Start temporary
+1 PRIMARY t4 eq_ref PRIMARY PRIMARY 4 test.t3.fid 1 Using index
+1 PRIMARY t1 ALL uid NULL NULL NULL 11 Using where; End temporary; Using join buffer (flat, BNL join)
+1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t1.fid 1 Using join buffer (flat, BKAH join); Rowid-ordered scan
+select name from t2, t1
+where t1.uid in (select t4.uid from t4, t3 where t3.uid=1 and t4.uid=t3.fid)
+and t2.uid=t1.fid;
+name
+A
+A
+B
+B
+C
+D
+E
+F
+G
+H
+I
+set join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+drop table t1,t2,t3,t4;
+#
+# Bug#50358 - semijoin execution of subquery with outerjoin
+# emplying join buffer
+#
+CREATE TABLE t1 (i int);
+CREATE TABLE t2 (i int);
+CREATE TABLE t3 (i int);
+INSERT INTO t1 VALUES (1), (2);
+INSERT INTO t2 VALUES (6);
+INSERT INTO t3 VALUES (1), (2);
+set @@optimizer_switch='semijoin=on';
+set @@optimizer_switch='materialization=on';
+set join_cache_level=0;
+EXPLAIN
+SELECT * FROM t1 WHERE t1.i IN
+(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2
+1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
+2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
+2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where
+SELECT * FROM t1 WHERE t1.i IN
+(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
+i
+1
+2
+set join_cache_level=2;
+EXPLAIN
+SELECT * FROM t1 WHERE t1.i IN
+(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2
+1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
+2 MATERIALIZED t3 ALL NULL NULL NULL NULL 2
+2 MATERIALIZED t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+SELECT * FROM t1 WHERE t1.i IN
+(SELECT t3.i FROM t3 LEFT JOIN t2 ON t2.i=t3.i);
+i
+1
+2
+set join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3;
+#
+# Bug #12546542: missing row with semijoin=off + join cache
+# (LP bug #922971)
+#
+CREATE TABLE t1 (a varchar(1024));
+INSERT INTO t1 VALUES ('v'), ('we');
+CREATE TABLE t2 (
+a varchar(1024) CHARACTER SET utf8 DEFAULT NULL, b int, c int
+);
+INSERT INTO t2 VALUES ('we',4,NULL), ('v',1305673728,6);
+CREATE TABLE t3 (b int, c int);
+INSERT INTO t3 VALUES (4,4);
+set @@optimizer_switch='semijoin=off';
+set @@optimizer_switch='materialization=off';
+set join_cache_level=0;
+EXPLAIN
+SELECT * FROM t1
+WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
+WHERE t2.c < 10 OR t3.c > 1);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
+2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
+2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where
+SELECT * FROM t1
+WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
+WHERE t2.c < 10 OR t3.c > 1);
+a
+v
+we
+set join_cache_level=2;
+EXPLAIN
+SELECT * FROM t1
+WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
+WHERE t2.c < 10 OR t3.c > 1);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
+2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
+2 DEPENDENT SUBQUERY t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+SELECT * FROM t1
+WHERE a IN (SELECT t2.a FROM t2 LEFT JOIN t3 ON t2.b = t3.b
+WHERE t2.c < 10 OR t3.c > 1);
+a
+v
+we
+set join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3;
+#
+# lp:925985 LEFT JOIN with optimize_join_buffer_size=off +
+# join_buffer_size > join_buffer_space_limit
+#
+CREATE TABLE t1 (a int);
+INSERT INTO t1 VALUES (5), (3);
+CREATE TABLE t2 (a int, b int);
+INSERT INTO t2 VALUES
+(3,30), (1,10), (7,70), (2,20),
+(3,31), (1,11), (7,71), (2,21),
+(3,32), (1,12), (7,72), (2,22);
+CREATE TABLE t3 (b int, c int);
+INSERT INTO t3 VALUES (32, 302), (42,400), (30,300);
+set @@optimizer_switch='optimize_join_buffer_size=off';
+set @@optimizer_switch='outer_join_with_cache=on';
+set join_buffer_space_limit=4096;
+set join_buffer_size=4096*2;
+set join_cache_level=2;
+EXPLAIN
+SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 12 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (incremental, BNL join)
+SELECT * FROM t1, t2 LEFT JOIN t3 ON t2.b=t3.b WHERE t1.a=t2.a;
+a a b b c
+3 3 32 32 302
+3 3 30 30 300
+3 3 31 NULL NULL
+set join_buffer_space_limit=@save_join_buffer_space_limit;
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t2,t3;
+#
+# Bug #1058071: LEFT JOIN using blobs
+# (MDEV-564) when join buffer size is small
+#
+CREATE TABLE t1 (
+col269 decimal(31,10) unsigned DEFAULT NULL,
+col280 geometry DEFAULT NULL,
+col281 tinyint(1) DEFAULT NULL,
+col282 time NOT NULL,
+col284 datetime DEFAULT NULL,
+col286 date DEFAULT NULL,
+col287 datetime DEFAULT NULL,
+col288 decimal(30,29) DEFAULT NULL,
+col291 time DEFAULT NULL,
+col292 time DEFAULT NULL
+) ENGINE=Aria;
+INSERT INTO t1 VALUES
+(0.0,PointFromText('POINT(9 0)'),0,'11:24:05','2013-04-14 21:30:28',NULL,'2011-12-20 06:00:34',9.9,'13:04:39',NULL),
+(0.0,NULL,127,'05:43:12','2012-09-05 06:15:27','2027-01-01','2011-10-29 10:48:29',0.0,'06:24:05','11:33:37'),
+(0.0,NULL,127,'12:54:41','2013-01-12 11:32:58','2011-11-03','2013-01-03 02:00:34',00,'11:54:15','20:19:15'),
+(0.0,PointFromText('POINT(9 0)'),0,'19:48:07','2012-07-16 15:45:25','2012-03-25','2013-09-07 17:21:52',0.5,'17:36:54','21:24:19'),
+(0.0,PointFromText('POINT(9 0)'),0,'03:43:48','2012-09-28 00:00:00','2012-06-26','2011-11-16 05:01:09',00,'01:25:42','19:30:06'),
+(0.0,LineStringFromText('LINESTRING(0 0,9 9,0 0,9 0,0 0)'),127,'11:33:21','2012-03-31 10:29:22','2012-10-10','2012-04-21 19:21:06',NULL,'05:13:22','09:48:34'),
+(NULL,PointFromText('POINT(9 0)'),127,'00:00:00','0000-00-00','2012-04-04 21:26:12','2013-03-04',0.0,'12:54:30',NULL),
+(NULL,PointFromText('POINT(9 0)'),1,'00:00:00','2013-05-01 22:37:49','2013-06-26','2012-09-22 17:31:03',0.0,'08:09:57','11:15:36');
+Warnings:
+Note 1265 Data truncated for column 'col286' at row 7
+CREATE TABLE t2 (b int) ENGINE=Aria;
+INSERT INTO t2 VALUES (NULL);
+CREATE TABLE t3 (c int) ENGINE=Aria;
+INSERT INTO t3 VALUES (NULL);
+set @@optimizer_switch = 'outer_join_with_cache=on,join_cache_incremental=on';
+set join_buffer_size=128;
+EXPLAIN
+SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1
+GROUP BY elt(t1.col282,1,t1.col280);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 8 Using temporary; Using filesort
+1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+SELECT 1 AS c FROM t1 NATURAL LEFT JOIN t2 LEFT OUTER JOIN t3 ON 1
+GROUP BY elt(t1.col282,1,t1.col280);
+c
+1
+DROP table t1,t2,t3;
+set join_buffer_size=@save_join_buffer_size;
+set @@optimizer_switch=@org_optimizer_switch,@local_optimizer_switch= @org_optimizer_switch;
+#
+# MDEV-5293: outer join, join buffering, and order by - invalid query plan
+#
+create table t0 (a int primary key) engine=myisam;
+insert into t0 values (1);
+create table t1(a int) engine=myisam;
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+alter table t1 add b int;
+create table t2 like t1;
+insert into t2 select * from t1;
+#The following must use "Using temporary; Using filesort" and not just "Using filesort":
+explain select * from t0,t1 left join t2 on t1.b=t2.b order by t0.a, t1.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t0 system NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 SIMPLE t1 ALL NULL NULL NULL NULL 10
+1 SIMPLE t2 ALL NULL NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
+drop table t0,t1,t2;
+# MDEV-6292: huge performance degradation for a sequence
+# of LEFT JOIN operations when using join buffer
+#
+CREATE TABLE t1 (
+id int(11) NOT NULL AUTO_INCREMENT,
+col1 varchar(255) NOT NULL DEFAULT '',
+PRIMARY KEY (id)
+) ENGINE=INNODB;
+CREATE TABLE t2 (
+id int(11) NOT NULL AUTO_INCREMENT,
+parent_id smallint(3) NOT NULL DEFAULT '0',
+col2 varchar(25) NOT NULL DEFAULT '',
+PRIMARY KEY (id)
+) ENGINE=INNODB;
+set join_buffer_size=8192;
+set join_cache_level=0;
+set @init_time:=now();
+SELECT t.*
+FROM
+t1 t
+LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
+ LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
+ LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
+ LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
+ LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
+ LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
+ LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
+ LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
+ LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
+ LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
+ LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
+ LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
+ LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
+ LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
+ LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
+ LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
+ LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
+ LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
+ LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
+ LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
+ LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
+ LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
+ LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
+ LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
+ LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
+ LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
+ LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
+ORDER BY
+col1;
+id col1
+select timestampdiff(second, @init_time, now()) <= 5;
+timestampdiff(second, @init_time, now()) <= 5
+1
+set join_cache_level=2;
+set @init_time:=now();
+SELECT t.*
+FROM
+t1 t
+LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
+ LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
+ LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
+ LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
+ LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
+ LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
+ LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
+ LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
+ LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
+ LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
+ LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
+ LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
+ LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
+ LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
+ LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
+ LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
+ LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
+ LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
+ LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
+ LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
+ LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
+ LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
+ LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
+ LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
+ LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
+ LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
+ LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
+ORDER BY
+col1;
+id col1
+select timestampdiff(second, @init_time, now()) <= 5;
+timestampdiff(second, @init_time, now()) <= 5
+1
+EXPLAIN
+SELECT t.*
+FROM
+t1 t
+LEFT JOIN t2 c1 ON c1.parent_id = t.id AND c1.col2 = "val"
+ LEFT JOIN t2 c2 ON c2.parent_id = t.id AND c2.col2 = "val"
+ LEFT JOIN t2 c3 ON c3.parent_id = t.id AND c3.col2 = "val"
+ LEFT JOIN t2 c4 ON c4.parent_id = t.id AND c4.col2 = "val"
+ LEFT JOIN t2 c5 ON c5.parent_id = t.id AND c5.col2 = "val"
+ LEFT JOIN t2 c6 ON c6.parent_id = t.id AND c6.col2 = "val"
+ LEFT JOIN t2 c7 ON c7.parent_id = t.id AND c7.col2 = "val"
+ LEFT JOIN t2 c8 ON c8.parent_id = t.id AND c8.col2 = "val"
+ LEFT JOIN t2 c9 ON c9.parent_id = t.id AND c9.col2 = "val"
+ LEFT JOIN t2 c10 ON c10.parent_id = t.id AND c10.col2 = "val"
+ LEFT JOIN t2 c11 ON c11.parent_id = t.id AND c11.col2 = "val"
+ LEFT JOIN t2 c12 ON c12.parent_id = t.id AND c12.col2 = "val"
+ LEFT JOIN t2 c13 ON c13.parent_id = t.id AND c13.col2 = "val"
+ LEFT JOIN t2 c14 ON c14.parent_id = t.id AND c14.col2 = "val"
+ LEFT JOIN t2 c15 ON c15.parent_id = t.id AND c15.col2 = "val"
+ LEFT JOIN t2 c16 ON c16.parent_id = t.id AND c16.col2 = "val"
+ LEFT JOIN t2 c17 ON c17.parent_id = t.id AND c17.col2 = "val"
+ LEFT JOIN t2 c18 ON c18.parent_id = t.id AND c18.col2 = "val"
+ LEFT JOIN t2 c19 ON c19.parent_id = t.id AND c19.col2 = "val"
+ LEFT JOIN t2 c20 ON c20.parent_id = t.id AND c20.col2 = "val"
+ LEFT JOIN t2 c21 ON c21.parent_id = t.id AND c21.col2 = "val"
+ LEFT JOIN t2 c22 ON c22.parent_id = t.id AND c22.col2 = "val"
+ LEFT JOIN t2 c23 ON c23.parent_id = t.id AND c23.col2 = "val"
+ LEFT JOIN t2 c24 ON c24.parent_id = t.id AND c24.col2 = "val"
+ LEFT JOIN t2 c25 ON c25.parent_id = t.id AND c25.col2 = "val"
+ LEFT JOIN t2 c26 ON c26.parent_id = t.id AND c26.col2 = "val"
+ LEFT JOIN t2 c27 ON c27.parent_id = t.id AND c27.col2 = "val"
+ORDER BY
+col1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t ALL NULL NULL NULL NULL 1 Using temporary; Using filesort
+1 SIMPLE c1 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE c2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c3 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c5 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c6 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c7 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c8 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c9 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c10 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c11 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c12 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c13 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c14 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c15 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c16 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c17 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c18 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c19 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c20 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c21 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c22 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c23 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c24 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c25 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c26 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+1 SIMPLE c27 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
+set join_buffer_size=@save_join_buffer_size;
+set join_cache_level=@save_join_cache_level;
+DROP TABLE t1,t2;
+#
+# MDEV-14960: BNLH used for materialized semi-join
+#
+CREATE TABLE t1 (i1 int);
+CREATE TABLE t2 (e1 int);
+CREATE TABLE t4 (e1 int);
+CREATE TABLE t5 (e1 int);
+INSERT INTO t1 VALUES
+(1),(2),(3),(4),(5),(6),(7),(8);
+INSERT INTO t1 SELECT i1+8 FROM t1;
+INSERT INTO t1 SELECT i1+16 FROM t1;
+INSERT INTO t1 SELECT i1+32 FROM t1;
+INSERT INTO t1 SELECT i1+64 FROM t1;
+INSERT INTO t2 SELECT * FROM t1;
+INSERT INTO t4 SELECT * FROM t1;
+INSERT INTO t5 SELECT * FROM t1;
+SET join_cache_level = 6;
+SET join_buffer_size=4096;
+SET join_buffer_space_limit=4096;
+set @@optimizer_switch = 'join_cache_hashed=on,optimize_join_buffer_size=on';
+EXPLAIN SELECT * FROM t1
+WHERE
+i1 < 10 AND
+i1 IN
+(SELECT i1 FROM
+(SELECT (t4.e1) i1 FROM t4
+LEFT JOIN t5 ON t4.e1 = t5.e1
+LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 128 Using where
+1 PRIMARY <subquery2> eq_ref distinct_key distinct_key 4 func 1
+2 MATERIALIZED t4 ALL NULL NULL NULL NULL 128
+2 MATERIALIZED t5 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; Using join buffer (flat, BNLH join)
+2 MATERIALIZED t2 hash_ALL NULL #hash#$hj 5 test.t4.e1 128 Using where; Using join buffer (incremental, BNLH join)
+SELECT * FROM t1
+WHERE
+i1 < 10 AND
+i1 IN
+(SELECT i1 FROM
+(SELECT (t4.e1) i1 FROM t4
+LEFT JOIN t5 ON t4.e1 = t5.e1
+LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a);
+i1
+1
+2
+3
+4
+5
+6
+7
+8
+9
+set join_cache_level=@save_join_cache_level;
+SET join_buffer_size=@save_join_buffer_size;
+SET join_buffer_space_limit=@save_join_buffer_space_limit;
+set @@optimizer_switch=@local_optimizer_switch;
+DROP TABLE t1,t4,t5,t2;
+#
+# MDEV-16603: BNLH for query with materialized semi-join
+#
+set join_cache_level=4;
+CREATE TABLE t1 ( i1 int, v1 varchar(1)) ENGINE=InnoDB;
+INSERT INTO t1 VALUES (7,'x');
+CREATE TABLE t2 (i1 int, v1 varchar(1), KEY v1 (v1,i1)) ENGINE=InnoDB;
+INSERT INTO t2 VALUES
+(NULL,'x'),(1,'x'),(3,'x'),(5,'x'),(8,'x'),(48,'x'),
+(228,'x'),(3,'y'),(1,'z'),(9,'z');
+ANALYZE TABLE t1,t2;
+Table Op Msg_type Msg_text
+test.t1 analyze status Engine-independent statistics collected
+test.t1 analyze status OK
+test.t2 analyze status Engine-independent statistics collected
+test.t2 analyze status OK
+CREATE TABLE temp
+SELECT t1.i1 AS f1, t1.v1 AS f2 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1));
+SELECT * FROM temp
+WHERE (f1,f2) IN (SELECT t1.i1, t1.v1 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1)));
+f1 f2
+7 x
+7 x
+7 x
+7 x
+7 x
+7 x
+7 x
+EXPLAIN EXTENDED SELECT * FROM temp
+WHERE (f1,f2) IN (SELECT t1.i1, t1.v1 FROM (t2 JOIN t1 ON (t1.v1 = t2.v1)));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 1 100.00
+1 PRIMARY temp hash_ALL NULL #hash#$hj 9 test.t1.i1,test.t1.v1 7 100.00 Using where; Using join buffer (flat, BNLH join)
+2 MATERIALIZED t1 ALL NULL NULL NULL NULL 1 100.00 Using where
+2 MATERIALIZED t2 hash_index v1 #hash#v1:v1 4:9 test.t1.v1 10 33.33 Using index; Using join buffer (flat, BNLH join)
+Warnings:
+Note 1003 select `test`.`temp`.`f1` AS `f1`,`test`.`temp`.`f2` AS `f2` from `test`.`temp` semi join (`test`.`t2` join `test`.`t1`) where `test`.`temp`.`f1` = `test`.`t1`.`i1` and `test`.`t2`.`v1` = `test`.`t1`.`v1` and `test`.`temp`.`f2` = `test`.`t1`.`v1`
+DROP TABLE t1,t2,temp;
+set join_cache_level=@save_join_cache_level;
+#
+# MDEV-5123 Remove duplicated conditions pushed both to join_tab->select_cond and join_tab->cache_select->cond for blocked joins.
+#
+set expensive_subquery_limit=0;
+create table t1 (c1 int);
+create table t2 (c2 int);
+create table t3 (c3 int);
+insert into t1 values (1), (2);
+insert into t2 values (1), (2);
+insert into t3 values (2);
+set @counter=0;
+explain
+select count(*) from t1 straight_join t2
+where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1);
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
+2 UNCACHEABLE SUBQUERY t3 system NULL NULL NULL NULL 1
+select count(*) from t1 straight_join t2
+where c1 = c2-0 and c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1);
+count(*)
+2
+select @counter;
+@counter
+2
+explain
+select count(*) from t1 straight_join t2
+where c1 = c2-0 and
+c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and
+c2 / 2 = 1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY t1 ALL NULL NULL NULL NULL 2
+1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
+2 UNCACHEABLE SUBQUERY t3 system NULL NULL NULL NULL 1
+set @counter=0;
+select count(*) from t1 straight_join t2
+where c1 = c2-0 and
+c2 <= (select max(c3) from t3 where c3 = 2 and @counter:=@counter+1) and
+c2 / 2 = 1;
+count(*)
+1
+select @counter;
+@counter
+2
+drop table t1,t2,t3;
+set expensive_subquery_limit=@save_expensive_subquery_limit;
+#
+# MDEV-6071: EXPLAIN chooses to use join buffer while execution turns it down
+#
+create table t1 (a int);
+insert into t1 values
+(7), (9), (1), (4), (2), (3), (5), (8), (11), (6), (10);
+explain select count(*) from t1, t1 t2 where t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 11
+1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
+set join_buffer_space_limit=1024*8;
+explain select count(*) from t1, t1 t2 where t1.a=t2.a;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 11
+1 SIMPLE t2 ALL NULL NULL NULL NULL 11 Using where; Using join buffer (flat, BNL join)
+set join_buffer_space_limit=@save_join_buffer_space_limit;
+drop table t1;
+#
+# MDEV-6687: Assertion `0' failed in Protocol::end_statement on query
+#
+SET join_cache_level = 3;
+# The following should have
+# - table order PROFILING,user,
+# - table db accessed with hash_ALL:
+explain
+SELECT * FROM INFORMATION_SCHEMA.PROFILING, mysql.db WHERE Select_priv = PAGE_FAULTS_MINOR;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
+set join_cache_level=@save_join_cache_level;
+create table t1 (c1 date not null, key (c1)) engine=innodb;
+insert t1 values ('2017-12-27');
+create table t2 (pk int, f1 int, f2 int);
+insert t2 values (4,1,1), (6,1,1);
+set join_buffer_size = 222222208;
+select f2 from t2,t1 where f2 = 0;
+f2
+drop table t1, t2;
+set join_buffer_size=@save_join_buffer_size;
+#
+# MDEV-21104: BNLH used for multi-join query with embedded outer join
+# and possible 'not exists' optimization
+#
+set join_cache_level=4;
+CREATE TABLE t1 (a int) ENGINE=MyISAM;
+INSERT INTO t1 VALUES (1),(2);
+CREATE TABLE t2 (b int, c int) ENGINE=MyISAM;
+INSERT INTO t2 VALUES (1,2),(2,4);
+CREATE TABLE t3 (d int, KEY(d)) ENGINE=MyISAM;
+INSERT INTO t3 VALUES (1),(2);
+CREATE TABLE t4 (e int primary key) ENGINE=MyISAM;
+INSERT INTO t4 VALUES (1),(2);
+ANALYZE TABLE t1,t2,t3,t4;
+Table Op Msg_type Msg_text
+test.t1 analyze status Engine-independent statistics collected
+test.t1 analyze status OK
+test.t2 analyze status Engine-independent statistics collected
+test.t2 analyze status OK
+test.t3 analyze status Engine-independent statistics collected
+test.t3 analyze status OK
+test.t4 analyze status Engine-independent statistics collected
+test.t4 analyze status OK
+SELECT * FROM t2 LEFT JOIN t3 ON c = d;
+b c d
+1 2 2
+2 4 NULL
+SELECT * FROM (t2 LEFT JOIN t3 ON c = d ) JOIN t4;
+b c d e
+1 2 2 1
+2 4 NULL 1
+1 2 2 2
+2 4 NULL 2
+EXPLAIN SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 hash_index d #hash#d:d 5:5 test.t2.c 2 Using where; Using index; Using join buffer (incremental, BNLH join)
+1 SIMPLE t4 hash_index PRIMARY #hash#PRIMARY:PRIMARY 4:4 test.t2.b 2 Using index; Using join buffer (incremental, BNLH join)
+SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e;
+a b c d e
+1 1 2 2 1
+2 1 2 2 1
+1 2 4 NULL 2
+2 2 4 NULL 2
+EXPLAIN SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e
+WHERE e IS NULL;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 hash_index d #hash#d:d 5:5 test.t2.c 2 Using where; Using index; Using join buffer (incremental, BNLH join)
+1 SIMPLE t4 hash_index PRIMARY #hash#PRIMARY:PRIMARY 4:4 test.t2.b 2 Using where; Using index; Not exists; Using join buffer (incremental, BNLH join)
+SELECT * FROM t1 LEFT JOIN ( ( t2 LEFT JOIN t3 ON c = d ) JOIN t4 ) ON b = e
+WHERE e IS NULL;
+a b c d e
+DROP TABLE t1,t2,t3,t4;
+set join_cache_level=@save_join_cache_level;
+#
+# MDEV-24767: forced BNLH used for equi-join supported by compound index
+#
+create table t1 (a int, b int, c int ) engine=myisam ;
+create table t2 (a int, b int, c int, primary key (c,a,b)) engine=myisam ;
+insert into t1 values (3,4,2), (5,6,4);
+insert into t2 values (3,4,2), (5,6,4);
+select t1.a, t1.b, t1.c from t1,t2
+where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
+a b c
+3 4 2
+5 6 4
+explain select t1.a, t1.b, t1.c from t1,t2
+where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t2 eq_ref PRIMARY PRIMARY 12 test.t1.c,test.t1.a,test.t1.b 1 Using index
+set join_cache_level=3;
+select t1.a, t1.b, t1.c from t1,t2
+where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
+a b c
+3 4 2
+5 6 4
+explain select t1.a, t1.b, t1.c from t1,t2
+where t2.a = t1.a and t2.b = t1.b and t2.c=t1.c;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t2 hash_index PRIMARY #hash#PRIMARY:PRIMARY 12:12 test.t1.c,test.t1.a,test.t1.b 2 Using index; Using join buffer (flat, BNLH join)
+drop table t1,t2;
+set join_cache_level=@save_join_cache_level;
+#
+# MDEV-21243: Join buffer: condition is checked in wrong place for range access
+#
+create table t1(a int primary key);
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t2 (a int);
+insert into t2 select A.a + 10*B.a from t1 A, t1 B;
+create table t3 (
+kp1 int,
+kp2 int,
+col1 int,
+col2 int,
+key (kp1, kp2)
+);
+insert into t3
+select
+A.a,
+B.a,
+A.a + 100*B.a,
+A.a + 100*B.a
+from
+t2 A, t2 B;
+analyze table t3;
+Table Op Msg_type Msg_text
+test.t3 analyze status Engine-independent statistics collected
+test.t3 analyze status Table is already up to date
+# The following must have "B.col1 + 1 < 33333" attached to table B
+# and not to the block-nl-join node:
+explain format=json
+select *
+from t1 a, t3 b
+where
+b.kp1=a.a and
+b.kp1 <= 10 and
+b.kp2 <= 10 and
+b.col1 +1 < 33333;
+EXPLAIN
+{
+ "query_block": {
+ "select_id": 1,
+ "nested_loop": [
+ {
+ "table": {
+ "table_name": "a",
+ "access_type": "range",
+ "possible_keys": ["PRIMARY"],
+ "key": "PRIMARY",
+ "key_length": "4",
+ "used_key_parts": ["a"],
+ "rows": 10,
+ "filtered": 100,
+ "attached_condition": "a.a <= 10",
+ "using_index": true
+ }
+ },
+ {
+ "block-nl-join": {
+ "table": {
+ "table_name": "b",
+ "access_type": "range",
+ "possible_keys": ["kp1"],
+ "key": "kp1",
+ "key_length": "10",
+ "used_key_parts": ["kp1", "kp2"],
+ "rows": 836,
+ "filtered": 76,
+ "index_condition": "b.kp2 <= 10",
+ "attached_condition": "b.kp2 <= 10 and b.col1 + 1 < 33333"
+ },
+ "buffer_type": "flat",
+ "buffer_size": "54",
+ "join_type": "BNL",
+ "attached_condition": "b.kp1 = a.a"
+ }
+ }
+ ]
+ }
+}
+drop table t1,t2,t3;
+# End of 10.3 tests
+set @@optimizer_switch=@save_optimizer_switch;
+set global innodb_stats_persistent= @innodb_stats_persistent_save;
+set global innodb_stats_persistent_sample_pages=
+@innodb_stats_persistent_sample_pages_save;
+#
+# MDEV-31226 Server crash or assertion failure with row size close to
+# join_buffer_size
+#
+set @org_optimizer_switch=@@optimizer_switch;
+set @org_join_buffer_size=@@join_buffer_size;
+CREATE TABLE t (f VARCHAR(16384)) ENGINE=MyISAM CHARACTER SET utf8;
+INSERT INTO t VALUES (REPEAT('a',16384)),(REPEAT('b',16384));
+SET OPTIMIZER_SWITCH = 'optimize_join_buffer_size=off';
+SET JOIN_BUFFER_SIZE = 16384;
+explain SELECT length(concat(t1.f,t2.f)) FROM t t1, t t2;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2
+1 SIMPLE t2 ALL NULL NULL NULL NULL 2
+SELECT length(concat(t1.f,t2.f)) FROM t t1, t t2;
+length(concat(t1.f,t2.f))
+32768
+32768
+32768
+32768
+DROP TABLE t;
+set @@optimizer_switch=@org_optimizer_switch;
+set @@join_buffer_size=@org_join_buffer_size;
+#
+# MDEV-31348 Assertion `last_key_entry >= end_pos' failed in
+# virtual bool JOIN_CACHE_HASHED::put_record()
+#
+SET JOIN_buffer_size=1;
+Warnings:
+Warning 1292 Truncated incorrect join_buffer_size value: '1'
+SET SESSION JOIN_cache_level=4;
+SET SESSION optimizer_switch='optimize_JOIN_buffer_size=OFF';
+SELECT * FROM information_schema.statistics JOIN information_schema.COLUMNS USING (table_name,column_name);
+ERROR HY001: Could not create a join buffer. Please check and adjust the value of the variables 'JOIN_BUFFER_SIZE (128)' and 'JOIN_BUFFER_SPACE_LIMIT (2097152)'
+SET JOIN_buffer_size=16384;
+SELECT * FROM information_schema.statistics JOIN information_schema.COLUMNS USING (table_name,column_name);
+#
+# MDEV-32351: Join buffer used for outer join with ON condition
+# depending only on outer tables
+#
+CREATE TABLE t1 (b int NOT NULL, PRIMARY KEY (b)) ENGINE=MYISAM;
+INSERT INTO t1 select seq from seq_1_to_10000;
+CREATE TABLE t2 (b int NOT NULL, d varchar(255), KEY (b)) ENGINE=MYISAM ;
+INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
+CREATE TABLE t3 (c int NOT NULL, PRIMARY KEY (c)) ENGINE=MYISAM ;
+INSERT INTO t3 select seq from seq_1_to_3000;
+CREATE TABLE t4 (c int NOT NULL, PRIMARY KEY (c)) ENGINE=MYISAM;
+INSERT INTO t4 select seq from seq_1_to_3000;
+ANALYZE TABLE t1,t2,t3,t4;
+Table Op Msg_type Msg_text
+test.t1 analyze status Engine-independent statistics collected
+test.t1 analyze status OK
+test.t2 analyze status Engine-independent statistics collected
+test.t2 analyze status OK
+test.t3 analyze status Engine-independent statistics collected
+test.t3 analyze status OK
+test.t4 analyze status Engine-independent statistics collected
+test.t4 analyze status OK
+set join_cache_level=0;
+EXPLAIN SELECT COUNT(*)
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 10000 Using index
+1 SIMPLE t2 ref b b 4 test.t1.b 1
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
+1 SIMPLE t4 index NULL PRIMARY 4 NULL 3000 Using where; Using index
+SELECT COUNT(*)
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+COUNT(*)
+12999
+set join_cache_level=default;
+EXPLAIN SELECT COUNT(*)
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 10000 Using index
+1 SIMPLE t2 ref b b 4 test.t1.b 1
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
+1 SIMPLE t4 index NULL PRIMARY 4 NULL 3000 Using where; Using index; Using join buffer (flat, BNL join)
+SELECT COUNT(*)
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+COUNT(*)
+12999
+DROP TABLE t1,t2,t3,t4;
+CREATE TABLE t1 (b int NOT NULL, PRIMARY KEY (b));
+INSERT INTO t1 select seq from seq_1_to_10;
+CREATE TABLE t2 (b int NOT NULL, d varchar(255), KEY (b)) ;
+INSERT INTO t2 VALUES (1,1),(2,2),(3,3);
+CREATE TABLE t3 (c int NOT NULL, PRIMARY KEY (c)) ;
+INSERT INTO t3 select seq from seq_1_to_3;
+CREATE TABLE t4 (c int NOT NULL, PRIMARY KEY (c)) ;
+INSERT INTO t4 select seq from seq_1_to_3;
+set join_cache_level=0;
+EXPLAIN SELECT *
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 10 Using index
+1 SIMPLE t2 ALL b NULL NULL NULL 3 Using where
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
+1 SIMPLE t4 index NULL PRIMARY 4 NULL 3 Using where; Using index
+SELECT *
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+b b d c c
+1 1 1 1 1
+1 1 1 1 2
+1 1 1 1 3
+2 2 2 2 NULL
+3 3 3 3 NULL
+4 NULL NULL NULL NULL
+5 NULL NULL NULL NULL
+6 NULL NULL NULL NULL
+7 NULL NULL NULL NULL
+8 NULL NULL NULL NULL
+9 NULL NULL NULL NULL
+10 NULL NULL NULL NULL
+set join_cache_level=default;
+EXPLAIN SELECT *
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index NULL PRIMARY 4 NULL 10 Using index
+1 SIMPLE t2 ALL b NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
+1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.d 1 Using where; Using index
+1 SIMPLE t4 index NULL PRIMARY 4 NULL 3 Using where; Using index; Using join buffer (flat, BNL join)
+SELECT *
+FROM t1
+LEFT JOIN t2 ON t1.b = t2.b
+LEFT JOIN t3 ON t2.d = t3.c
+LEFT JOIN t4 ON t3.c=1;
+b b d c c
+1 1 1 1 1
+1 1 1 1 2
+1 1 1 1 3
+2 2 2 2 NULL
+3 3 3 3 NULL
+4 NULL NULL NULL NULL
+5 NULL NULL NULL NULL
+6 NULL NULL NULL NULL
+7 NULL NULL NULL NULL
+8 NULL NULL NULL NULL
+9 NULL NULL NULL NULL
+10 NULL NULL NULL NULL
+DROP TABLE t1,t2,t3,t4;
+#
+# End of 10.4 tests
+#