--source include/big_test.inc
--source include/have_sequence.inc
--source include/have_64bit.inc

set @save_rand_seed1=  @@RAND_SEED1;
set @save_rand_seed2=  @@RAND_SEED2;
set @@RAND_SEED1=810763568, @@RAND_SEED2=600681772;

create table t1(a int);
insert into t1 select seq from seq_1_to_10000 order by rand(),seq;
delimiter |;

--echo #
--echo # parameters:
--echo # mean           mean for the column to be considered
--echo # max_val        max_value for the column to be considered
--echo #
--echo # This function generate a sample of a normal distribution
--echo # This function return a point
--echo # of the normal distribution with a given mean.
--echo #

CREATE FUNCTION
generate_normal_distribution_sample(mean DOUBLE, max_val DOUBLE)RETURNS DOUBLE
BEGIN
  DECLARE z DOUBLE DEFAULT 0;
  SET z= (rand() + rand() + rand() + rand() + rand() + rand())/6;
  SET z= 2*(max_val-mean)*z;
  SET z= z + mean - (max_val-mean);
  return z;
END|

--echo #
--echo # parameters:
--echo # len      length of the random string to be generated
--echo #
--echo # This function generates a random string for the length passed
--echo # as an argument with characters in the range of [A,Z]
--echo #

CREATE FUNCTION generate_random_string(len INT) RETURNS varchar(128)
BEGIN
  DECLARE str VARCHAR(256) DEFAULT '';
  DECLARE x INT DEFAULT 0;
  WHILE (len > 0) DO
    SET x =round(rand()*25);
    SET str= CONCAT(str, CHAR(65 + x));
    SET len= len-1;
  END WHILE;
RETURN str;
END|

--echo #
--echo # parameters:
--echo # mean      mean for the column to be considered
--echo # min_val   min_value for the column to be considered
--echo # max_val   max_value for the column to be considered
--echo #
--echo # This function generate a normal distribution sample in the range of
--echo # [min_val, max_val]
--echo #

CREATE FUNCTION
clipped_normal_distribution(mean DOUBLE, min_val DOUBLE, max_val DOUBLE)
RETURNS INT
BEGIN
  DECLARE r DOUBLE DEFAULT 0;
  WHILE 1=1 DO
    set r= generate_normal_distribution_sample(mean, max_val);
    IF (r >= min_val AND r <= max_val) THEN
      RETURN round(r);
    end if;
  END WHILE;
 RETURN 0;
END|

delimiter ;|

create table t2 (id INT NOT NULL, a INT, b int);
insert into t2
select a, clipped_normal_distribution(12, 0, 64),
       clipped_normal_distribution(32, 0, 128)
from t1;

CREATE TABLE t3(
  id INT NOT NULL,
  names VARCHAR(64),
  address VARCHAR(128),
  PRIMARY KEY (id)
);

--echo #
--echo # table t3 stores random strings calculated from the length stored in
--echo # table t2
--echo #

insert into t3
select id, generate_random_string(a), generate_random_string(b) from t2;


let $query= select id DIV 100 as x,
            MD5(group_concat(substring(names,1,3), substring(address,1,3)
                order by id))
            FROM t3
            GROUP BY x;

--echo #
--echo # All records fit in memory
--echo #

set sort_buffer_size=262144*10;
--source include/analyze-format.inc
eval analyze format=json $query;
flush status;
eval $query;
show status like '%sort%';
set sort_buffer_size=default;

--echo #
--echo # Test for merge_many_buff
--echo #

set sort_buffer_size=32768;
--source include/analyze-format.inc
eval analyze format=json $query;
flush status;
eval $query;
show status like '%sort%';
set sort_buffer_size=default;

--echo #
--echo # CASE #1 Packed sort keys with addon fields
--echo #

ALTER TABLE t3 ADD INDEX idx(names, address);

let $file1 = `SELECT CONCAT(@@datadir, "t1.txt")`;
let $file2 = `SELECT CONCAT(@@datadir, "t2.txt")`;

set sort_buffer_size= 2097152;
--source include/analyze-format.inc
eval ANALYZE FORMAT=JSON  SELECT id, names, address FROM t3 ORDER BY names, address;
flush status;
evalp SELECT id, names, address INTO OUTFILE '$file1' FROM t3 ORDER BY names, address;

--echo # Sort_merge_passes should be 0
show status like '%sort%';

evalp SELECT id, names, address INTO OUTFILE '$file2' FROM t3 FORCE INDEX(idx) ORDER BY names, address;

diff_files $file1 $file2;

--remove_file $file1

--echo #
--echo # CASE #2 Packed sort keys and ROW_ID
--echo #

set @save_max_length_for_sort_data=@@max_length_for_sort_data;
set max_length_for_sort_data= 300;

set sort_buffer_size= 1097152;
--source include/analyze-format.inc
eval ANALYZE FORMAT=JSON  SELECT id, names, address FROM t3 ORDER BY names, address;
flush status;
evalp SELECT id, names, address INTO OUTFILE '$file1' FROM t3 ORDER BY names, address;

--echo # Sort_merge_passes should be 0
show status like '%sort%';

diff_files $file1 $file2;

--remove_file $file1
--remove_file $file2

set @@max_length_for_sort_data=@save_max_length_for_sort_data;
set @@sort_buffer_size=default;

set @@RAND_SEED1= @save_rand_seed1;
set @@RAND_SEED2= @save_rand_seed2;

drop function generate_normal_distribution_sample;
drop function generate_random_string;
drop function clipped_normal_distribution;
drop table t1, t2, t3;