#
# Test character set narrowing
#

--source include/have_utf8mb4.inc
--source include/have_sequence.inc
--source include/not_embedded.inc

set
  @tmp_csetn_os= @@optimizer_switch,
  optimizer_switch='cset_narrowing=on';

set names utf8mb4;
create table t1 (
  mb3name varchar(32),
  mb3 varchar(32) collate utf8mb3_general_ci,
  key(mb3)
);
insert into t1 select seq, seq from seq_1_to_10000;
insert into t1 values ('mb3-question-mark', '?');
insert into t1 values ('mb3-replacement-char', _utf8mb3 0xEFBFBD);

create table t10 (
  pk int auto_increment primary key,
  mb4name varchar(32),
  mb4 varchar(32) character set utf8mb4 collate utf8mb4_general_ci
);

insert into t10 (mb4name, mb4) values
  ('mb4-question-mark','?'),
  ('mb4-replacement-char', _utf8mb4 0xEFBFBD),
  ('mb4-smiley', _utf8mb4 0xF09F988A),
  ('1', '1');

analyze table t1,t10 persistent for all;
--echo #
--echo # Check that constants are already handled: the following should use
--echo #  ref/range, because constants are converted into utf8mb3.
--echo #
select collation('abc');
explain select * from t1 force index (mb3) where t1.mb3='abc';
explain select * from t1 force index (mb3) where t1.mb3 in ('abc','cde','xyz');
explain select * from t1 force index (mb3) where t1.mb3 between 'abc' and 'acc';
explain select * from t1 force index (mb3) where t1.mb3 <'000';

--echo # If a constant can't be represented in utf8mb3, an error is produced:
--error ER_CANT_AGGREGATE_2COLLATIONS
explain select * from t1 force index (mb3) where t1.mb3='😊';

--echo #
--echo # Check ref access on mb3_field=mb4_field
--echo #
explain format=json
select * from t10,t1 where t10.mb4=t1.mb3;

select * from t10,t1 where t10.mb4=t1.mb3;

select * from t10,t1 use index() where t10.mb4=t1.mb3;

explain format=json
select * from t10,t1 where t10.mb4<=>t1.mb3;

select * from t10,t1 where t10.mb4<=>t1.mb3;

set statement optimizer_switch='cset_narrowing=off', join_cache_level=0 for
explain format=json
select * from t10,t1 where t10.mb4=t1.mb3;

--echo #
--echo # Check ref access on mb3_field=mb4_expr
--echo #
explain format=json
select * from t10,t1 where t1.mb3=concat('',t10.mb4);

select * from t10,t1 where t1.mb3=concat('',t10.mb4);

select * from t10,t1 use index() where t1.mb3=concat('',t10.mb4);

--echo # Check that ref optimizer gets the right constant.
--echo #  We need a const table for that, because key=const is handled by
--echo #  coercing the constant.
--echo #
--echo # So, we take the smiley:
select * from t10 where t10.pk=3;
set optimizer_trace=1;

--echo # And see that we've got the Replacement Character in the ranges:
explain
select * from t10, t1 where t10.mb4=t1.mb3 and t10.pk=3;

select
  json_detailed(json_extract(trace, '$**.range_scan_alternatives')) as JS
from
  information_schema.optimizer_trace;

select * from t10, t1 where t10.mb4=t1.mb3 and t10.pk=3;

--echo #
--echo # Will range optimizer handle t1.mb3>t10.mb4? No...
--echo #

explain format=json
select * from t10, t1 where (t1.mb3=t10.mb4 or t1.mb3='hello') and t10.pk=3;

explain format=json
select * from t10, t1 where t1.mb3>t10.mb4 and t10.pk=3;

--echo # For comparison, it will handle it when collations match:
create table t2 (
  mb4name varchar(32),
  mb4 varchar(32) collate utf8mb4_general_ci,
  key(mb4)
);
insert into t2 select * from t1;
explain format=json
select * from t10, t2 where t2.mb4>t10.mb4 and t10.pk=3;

--echo #
--echo # Check multiple equalities
--echo #

--echo # - ref acccess lookup keys do use equality substitution,
--echo # - concat() arguments don't
explain format=json
select straight_join * from t10,t1 force index(mb3),t2
where
  t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';
select json_detailed(json_extract(trace, '$**.condition_processing')) as JS
from information_schema.optimizer_trace;

select straight_join * from t10,t1 force index(mb3),t2
where
  t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';

--echo # Equality substitution doesn't happen for constants, for both narrowing
--echo #  and non-narrowing comparisons:
explain format=json
select * from t10,t1,t2
where
  t1.mb3=t2.mb4 and t2.mb4=t10.mb4 and t10.mb4='hello' and
  concat(t1.mb3, t2.mb4, t10.mb4)<>'Bebebe';

select json_detailed(json_extract(trace, '$**.condition_processing')) as JS
from information_schema.optimizer_trace;

drop table t2;
drop table t1, t10;

set optimizer_switch=@tmp_csetn_os;