~drizzle-trunk/drizzle/development

#
# Hash semi-join regression tests
# (WL#1110: Subquery optimization: materialization)
#

--disable_warnings
drop table if exists t1, t2, t3, t1i, t2i, t3i;
--enable_warnings

create table t1 (a1 char(8), a2 char(8));
create temporary table t2 (b1 char(8), b2 char(8)) ENGINE=MyISAM;
create table t3 (c1 char(8), c2 char(8));

insert into t1 values ('1 - 00', '2 - 00');
insert into t1 values ('1 - 01', '2 - 01');
insert into t1 values ('1 - 02', '2 - 02');

insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 01', '2 - 01');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 02', '2 - 02');
insert into t2 values ('1 - 03', '2 - 03');

insert into t3 values ('1 - 01', '2 - 01');
insert into t3 values ('1 - 02', '2 - 02');
insert into t3 values ('1 - 03', '2 - 03');
insert into t3 values ('1 - 04', '2 - 04');

# Indexed columns
create temporary table t1i (a1 char(8), a2 char(8)) ENGINE=MyISAM;
create table t2i (b1 char(8), b2 char(8));
create temporary table t3i (c1 char(8), c2 char(8)) ENGINE=MyISAM;
create index it1i1 on t1i (a1);
create index it1i2 on t1i (a2);
create index it1i3 on t1i (a1, a2);

create index it2i1 on t2i (b1);
create index it2i2 on t2i (b2);
create index it2i3 on t2i (b1, b2);

create index it3i1 on t3i (c1);
create index it3i2 on t3i (c2);
create index it3i3 on t3i (c1, c2);

insert into t1i select * from t1;
insert into t2i select * from t2;
insert into t3i select * from t3;

--echo /********************************************************************
--echo  * Simple tests.
--echo  ********************************************************************/
--echo # non-indexed nullable fields
--replace_column 9 #
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0');
select * from t1 where a1 in (select b1 from t2 where b1 > '0');

--replace_column 9 #
explain extended
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);
select * from t1 where a1 in (select b1 from t2 where b1 > '0' group by b1);

--replace_column 9 #
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 where b1 > '0' group by b1, b2);

--replace_column 9 #
explain extended
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);
select * from t1 where (a1, a2) in (select b1, min(b2) from t2 where b1 > '0' group by b1);

# indexed columns
--replace_column 9 #
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0');
select * from t1i where a1 in (select b1 from t2i where b1 > '0');

--replace_column 9 #
explain extended
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);
select * from t1i where a1 in (select b1 from t2i where b1 > '0' group by b1);

--replace_column 9 #
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0');

--replace_column 9 #
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i where b1 > '0' group by b1, b2);

--replace_column 9 #
explain extended
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);
select * from t1i where (a1, a2) in (select b1, min(b2) from t2i where b1 > '0' group by b1);

# materialize the result of ORDER BY
# non-indexed fields
--replace_column 9 #
explain extended
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
select * from t1 where (a1, a2) in (select b1, b2 from t2 order by b1, b2);
# indexed fields
--replace_column 9 #
explain extended
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);
select * from t1i where (a1, a2) in (select b1, b2 from t2i order by b1, b2);

# nested subqueries, views
--replace_column 9 #
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2 where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));

--replace_column 9 #
explain extended
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3i
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3i
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));

--replace_column 9 #
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 where c2 LIKE '%02') or
                         b2 in (select c2 from t3 where c2 LIKE '%03')) and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 where c2 LIKE '%02') or
                         b2 in (select c2 from t3 where c2 LIKE '%03')) and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));

# as above with correlated innermost subquery
--replace_column 9 #
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 t3a where c1 = a1) or
                         b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
      (a1, a2) in (select c1, c2 from t3 t3c
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 t3a where c1 = a1) or
                         b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
      (a1, a2) in (select c1, c2 from t3 t3c
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));


# multiple levels of nesting subqueries, unions
--replace_column 9 #
explain extended
(select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 where c2 LIKE '%02') or
                         b2 in (select c2 from t3 where c2 LIKE '%03')
                   group by b1, b2) and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3i
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));

(select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 where c2 LIKE '%02') or
                         b2 in (select c2 from t3 where c2 LIKE '%03')
                   group by b1, b2) and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')))
UNION
(select * from t1i
where (a1, a2) in (select b1, b2 from t2i where b1 >  '0') and
      (a1, a2) in (select c1, c2 from t3i
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')));


# UNION of subqueries as a subquery (thus it is not computed via materialization)
--replace_column 9 #
explain extended
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
select * from t1
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
      (a1, a2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0'));
# as above, with a join conditon between the outer references
--replace_column 9 #
explain extended
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
      (c1, c2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
       a1 = c1;
select * from t1, t3
where (a1, a2) in (select * from t1 where a1 > '0' UNION select * from t2 where b1 < '9') and
      (c1, c2) in (select c1, c2 from t3
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0')) and
       a1 = c1;


--echo /*********************************************************************
--echo * Negative tests, where materialization should not be applied.
--echo **********************************************************************/
--echo # UNION in a subquery
--replace_column 9 #
explain extended
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');
select * from t3
where c1 in (select a1 from t1 where a1 > '0' UNION select b1 from t2 where b1 < '9');

# correlation
--replace_column 9 #
explain extended
select * from t1
where (a1, a2) in (select b1, b2 from t2
                   where b2 in (select c2 from t3 t3a where c1 = a1) or
                         b2 in (select c2 from t3 t3b where c2 LIKE '%03')) and
      (a1, a2) in (select c1, c2 from t3 t3c
                   where (c1, c2) in (select b1, b2 from t2i where b2 > '0' or b2 = a2));

DROP TABLE t1i, t2i, t3i;

# subquery has no tables
--replace_column 9 #
explain extended
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');
select * from t1 where (a1, a2) in (select '1 - 01', '2 - 01');


/******************************************************************************
* Subqueries in other uncovered clauses.
******************************************************************************/

/* SELECT clause */
select ((a1,a2) IN (select * from t2 where b2 > '0')) IS NULL from t1;

/* GROUP BY clause */
create temporary table columns (col int key) ENGINE=MyISAM;
insert into columns values (1), (2);

--replace_column 9 #
explain extended
select * from t1 group by (select col from columns limit 1);
select * from t1 group by (select col from columns limit 1);

--replace_column 9 #
explain extended
select * from t1 group by (a1 in (select col from columns));
select * from t1 group by (a1 in (select col from columns));

--echo /* ORDER BY clause */
--replace_column 9 #
explain extended
select * from t1 order by (select col from columns limit 1);
select * from t1 order by (select col from columns limit 1);

DROP TABLE columns;

/******************************************************************************
* Column types/sizes that affect materialization.
******************************************************************************/

/*
  Test that BLOBs are not materialized (except when arguments of some functions).
*/
# force materialization to be always considered
set @prefix_len = 6;

# BLOB == 16 (small blobs that could be stored in MEMORY tables)
set @blob_len = 16;
set @suffix_len = @blob_len - @prefix_len;

create temporary table t1_16 (a1 blob, a2 blob) ENGINE=MyISAM;
create temporary table t2_16 (b1 blob, b2 blob) ENGINE=MyISAM;
create temporary table t3_16 (c1 blob, c2 blob) ENGINE=MyISAM;

insert into t1_16 values
 (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_16 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_16 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));

insert into t2_16 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_16 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_16 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));

insert into t3_16 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_16 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_16 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_16 values
 (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));

# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_16
where a1 in (select b1 from t2_16 where b1 > '0');

# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_16
where (a1,a2) in (select b1, b2 from t2_16 where b1 > '0');

# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_16
where a1 in (select substring(b1,1,16) from t2_16 where b1 > '0');

# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);

select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);

set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)

explain extended select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);

select left(a1,7), left(a2,7)
from t1_16
where a1 in (select group_concat(b1) from t2_16 group by b2);

# BLOB column at the second (intermediate) level of nesting
explain extended
select * from t1
where concat(a1,'x') IN
      (select left(a1,8) from t1_16
       where (a1, a2) IN
             (select t2_16.b1, t2_16.b2 from t2_16, t2
              where t2.b2 = substring(t2_16.b2,1,6) and
                    t2.b1 IN (select c1 from t3 where c2 > '0')));


drop table t1_16, t2_16, t3_16;


# BLOB == 512 (CONVERT_IF_BIGGER_TO_BLOB == 512)
set @blob_len = 512;
set @suffix_len = @blob_len - @prefix_len;

create temporary table t1_512 (a1 blob, a2 blob) ENGINE=MyISAM;
create temporary table t2_512 (b1 blob, b2 blob) ENGINE=MyISAM;
create temporary table t3_512 (c1 blob, c2 blob) ENGINE=MyISAM;

insert into t1_512 values
 (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_512 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_512 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));

insert into t2_512 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_512 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_512 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));

insert into t3_512 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_512 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_512 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_512 values
 (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));

# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_512
where a1 in (select b1 from t2_512 where b1 > '0');

# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_512
where (a1,a2) in (select b1, b2 from t2_512 where b1 > '0');

# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_512
where a1 in (select substring(b1,1,512) from t2_512 where b1 > '0');

# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);

select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);

set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 512)

explain extended select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);

select left(a1,7), left(a2,7)
from t1_512
where a1 in (select group_concat(b1) from t2_512 group by b2);

drop table t1_512, t2_512, t3_512;


# BLOB == 1024 (group_concat_max_len == 1024)
set @blob_len = 1024;
set @suffix_len = @blob_len - @prefix_len;

create temporary table t1_1024 (a1 blob, a2 blob) ENGINE=MyISAM;
create temporary table t2_1024 (b1 blob, b2 blob) ENGINE=MyISAM;
create temporary table t3_1024 (c1 blob, c2 blob) ENGINE=MyISAM;

insert into t1_1024 values
 (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1024 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1024 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));

insert into t2_1024 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1024 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1024 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));

insert into t3_1024 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1024 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1024 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1024 values
 (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));

# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select b1 from t2_1024 where b1 > '0');

# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1024
where (a1,a2) in (select b1, b2 from t2_1024 where b1 > '0');

# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select substring(b1,1,1024) from t2_1024 where b1 > '0');

# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);

select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);

set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1024)

explain extended select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);

select left(a1,7), left(a2,7)
from t1_1024
where a1 in (select group_concat(b1) from t2_1024 group by b2);

drop table t1_1024, t2_1024, t3_1024;


# BLOB == 1025
set @blob_len = 1025;
set @suffix_len = @blob_len - @prefix_len;

create temporary table t1_1025 (a1 blob, a2 blob) ENGINE=MyISAM;
create temporary table t2_1025 (b1 blob, b2 blob) ENGINE=MyISAM;
create temporary table t3_1025 (c1 blob, c2 blob) ENGINE=MyISAM;

insert into t1_1025 values
 (concat('1 - 00', repeat('x', @suffix_len)), concat('2 - 00', repeat('x', @suffix_len)));
insert into t1_1025 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t1_1025 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));

insert into t2_1025 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t2_1025 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t2_1025 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));

insert into t3_1025 values
 (concat('1 - 01', repeat('x', @suffix_len)), concat('2 - 01', repeat('x', @suffix_len)));
insert into t3_1025 values
 (concat('1 - 02', repeat('x', @suffix_len)), concat('2 - 02', repeat('x', @suffix_len)));
insert into t3_1025 values
 (concat('1 - 03', repeat('x', @suffix_len)), concat('2 - 03', repeat('x', @suffix_len)));
insert into t3_1025 values
 (concat('1 - 04', repeat('x', @suffix_len)), concat('2 - 04', repeat('x', @suffix_len)));

# single value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select b1 from t2_1025 where b1 > '0');

# row value transformer
explain extended select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1025
where (a1,a2) in (select b1, b2 from t2_1025 where b1 > '0');

# string function with a blob argument, the return type may be != blob
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');

select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select substring(b1,1,1025) from t2_1025 where b1 > '0');

# group_concat with a blob argument - depends on
# the variable group_concat_max_len, and
# convert_blob_length == max_len*collation->mbmaxlen > CONVERT_IF_BIGGER_TO_BLOB
explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);

select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);

set @@group_concat_max_len = 256; # anything < (CONVERT_IF_BIGGER_TO_BLOB = 1025)

explain extended select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);

select left(a1,7), left(a2,7)
from t1_1025
where a1 in (select group_concat(b1) from t2_1025 group by b2);

drop table t1_1025, t2_1025, t3_1025;
drop table t1, t2, t3;

/******************************************************************************
* Test the cache of the left operand of IN.
******************************************************************************/
# Test that default values of Cached_item are not used for comparison
create temporary table t1 (s1 int) ENGINE=MyISAM;
create temporary table t2 (s2 int) ENGINE=MyISAM;
insert into t1 values (5),(1),(0);
insert into t2 values (0), (1);
select s2 from t2 where s2 in (select s1 from t1);
drop table t1, t2;

create temporary table t1 (a int not null, b int not null) ENGINE=MyISAM;
create temporary table t2 (c int not null, d int not null) ENGINE=MyISAM;
create temporary table t3 (e int not null) ENGINE=MyISAM;

# the first outer row has no matching inner row
insert into t1 values (1,10);
insert into t1 values (1,20);
insert into t1 values (2,10);
insert into t1 values (2,20);
insert into t1 values (2,30);
insert into t1 values (3,20);
insert into t1 values (4,40);

insert into t2 values (2,10);
insert into t2 values (2,20);
insert into t2 values (2,40);
insert into t2 values (3,20);
insert into t2 values (4,10);
insert into t2 values (5,10);

insert into t3 values (10);
insert into t3 values (10);
insert into t3 values (20);
insert into t3 values (30);

explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);

create index it1a on t1(a);

explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);

# the first outer row has a matching inner row
insert into t2 values (1,10);

explain extended
select a from t1 where a in (select c from t2 where d >= 20);
select a from t1 where a in (select c from t2 where d >= 20);

# cacheing for IN predicates inside a having clause - here the cached
# items are changed to point to temporary tables.
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);

# create an index that can be used for the outer query GROUP BY 
create index iab on t1(a, b);
explain extended
select a from t1 group by a having a in (select c from t2 where d >= 20);
select a from t1 group by a having a in (select c from t2 where d >= 20);

explain extended
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
select a from t1 group by a
having a in (select c from t2 where d >= some(select e from t3 where max(b)=e));
explain extended
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));
select a from t1
where a in (select c from t2 where d >= some(select e from t3 where b=e));

drop table t1, t2, t3;