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Fixed the bug mdev-12838.
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If the optimizer chose an execution plan where
a semi-join nest were materialized and the
result of materialization was scanned to access
other tables by ref access it could build a key
over columns of the tables from the nest that
were actually inaccessible.
The patch performs a proper check whether a key
that uses columns of the tables from a materialized
semi-join nest can be employed to access outer tables.
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@igorbabaev
igorbabaev committed Jun 7, 2017
1 parent 2cb94aa commit c258ca2
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Showing 6 changed files with 461 additions and 5 deletions.
88 changes: 88 additions & 0 deletions mysql-test/r/subselect_mat.result
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2272,6 +2272,94 @@ pk f1 sq
5 3 5
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1,t2;
#
# mdev-12838: scan of materialized of semi-join subquery in join
#
set @save_optimizer_switch=@@optimizer_switch;
CREATE TABLE t1 (
dispatch_group varchar(32),
assignment_group varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx1 (dispatch_group),
KEY idx2 (assignment_group)
) ENGINE=MyISAM;
CREATE TABLE t2 (
ugroup varchar(32),
user varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx3 (ugroup),
KEY idx4 (user)
) ENGINE=MyISAM;
CREATE TABLE t3 (
type mediumtext,
sys_id char(32),
PRIMARY KEY (sys_id)
) ENGINE=MyISAM;
set optimizer_switch='materialization=off';
explain SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ref idx3,idx4 idx4 35 const 2 Using index condition; Using where; Start temporary
1 PRIMARY t3_i eq_ref PRIMARY PRIMARY 32 test.t2.ugroup 1 Using index condition; Using where
1 PRIMARY t1 ref idx1,idx2 idx1 35 test.t3_i.sys_id 2 Using index condition; Using where; End temporary
1 PRIMARY t3 eq_ref PRIMARY PRIMARY 32 test.t1.assignment_group 1 Using where; Using index
SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
assignment_group
df50316637232000158bbfc8bcbe5d23
e08fad2637232000158bbfc8bcbe5d39
ec70316637232000158bbfc8bcbe5d60
7b10fd2637232000158bbfc8bcbe5d30
ebb4620037332000158bbfc8bcbe5d89
set optimizer_switch='materialization=on';
explain SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2
1 PRIMARY t1 ref idx1,idx2 idx1 35 test.t2.ugroup 2 Using where
1 PRIMARY t3 eq_ref PRIMARY PRIMARY 32 test.t1.assignment_group 1 Using where; Using index
2 MATERIALIZED t2 ref idx3,idx4 idx4 35 const 2 Using index condition; Using where
2 MATERIALIZED t3_i eq_ref PRIMARY PRIMARY 32 test.t2.ugroup 1 Using index condition; Using where
SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
assignment_group
df50316637232000158bbfc8bcbe5d23
e08fad2637232000158bbfc8bcbe5d39
ec70316637232000158bbfc8bcbe5d60
7b10fd2637232000158bbfc8bcbe5d30
ebb4620037332000158bbfc8bcbe5d89
DROP TABLE t1,t2,t3;
set optimizer_switch=@save_optimizer_switch;
# End of 5.5 tests
set @subselect_mat_test_optimizer_switch_value=null;
set @@optimizer_switch='materialization=on,in_to_exists=off,semijoin=off';
Expand Down
88 changes: 88 additions & 0 deletions mysql-test/r/subselect_sj_mat.result
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2312,4 +2312,92 @@ pk f1 sq
5 3 5
set optimizer_switch= @save_optimizer_switch;
DROP TABLE t1,t2;
#
# mdev-12838: scan of materialized of semi-join subquery in join
#
set @save_optimizer_switch=@@optimizer_switch;
CREATE TABLE t1 (
dispatch_group varchar(32),
assignment_group varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx1 (dispatch_group),
KEY idx2 (assignment_group)
) ENGINE=MyISAM;
CREATE TABLE t2 (
ugroup varchar(32),
user varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx3 (ugroup),
KEY idx4 (user)
) ENGINE=MyISAM;
CREATE TABLE t3 (
type mediumtext,
sys_id char(32),
PRIMARY KEY (sys_id)
) ENGINE=MyISAM;
set optimizer_switch='materialization=off';
explain SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ref idx3,idx4 idx4 35 const 2 Using index condition; Using where; Start temporary
1 PRIMARY t3_i eq_ref PRIMARY PRIMARY 32 test.t2.ugroup 1 Using index condition; Using where
1 PRIMARY t1 ref idx1,idx2 idx1 35 test.t3_i.sys_id 2 Using index condition; Using where; End temporary
1 PRIMARY t3 eq_ref PRIMARY PRIMARY 32 test.t1.assignment_group 1 Using where; Using index
SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
assignment_group
df50316637232000158bbfc8bcbe5d23
e08fad2637232000158bbfc8bcbe5d39
ec70316637232000158bbfc8bcbe5d60
7b10fd2637232000158bbfc8bcbe5d30
ebb4620037332000158bbfc8bcbe5d89
set optimizer_switch='materialization=on';
explain SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <subquery2> ALL distinct_key NULL NULL NULL 2
1 PRIMARY t1 ref idx1,idx2 idx1 35 test.t2.ugroup 2 Using where
1 PRIMARY t3 eq_ref PRIMARY PRIMARY 32 test.t1.assignment_group 1 Using where; Using index
2 MATERIALIZED t2 ref idx3,idx4 idx4 35 const 2 Using index condition; Using where
2 MATERIALIZED t3_i eq_ref PRIMARY PRIMARY 32 test.t2.ugroup 1 Using index condition; Using where
SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');
assignment_group
df50316637232000158bbfc8bcbe5d23
e08fad2637232000158bbfc8bcbe5d39
ec70316637232000158bbfc8bcbe5d60
7b10fd2637232000158bbfc8bcbe5d30
ebb4620037332000158bbfc8bcbe5d89
DROP TABLE t1,t2,t3;
set optimizer_switch=@save_optimizer_switch;
# End of 5.5 tests
207 changes: 207 additions & 0 deletions mysql-test/t/subselect_sj_mat.test
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1944,4 +1944,211 @@ set optimizer_switch= @save_optimizer_switch;

DROP TABLE t1,t2;

--echo #
--echo # mdev-12838: scan of materialized of semi-join subquery in join
--echo #

set @save_optimizer_switch=@@optimizer_switch;

CREATE TABLE t1 (
dispatch_group varchar(32),
assignment_group varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx1 (dispatch_group),
KEY idx2 (assignment_group)
) ENGINE=MyISAM;

CREATE TABLE t2 (
ugroup varchar(32),
user varchar(32),
sys_id char(32),
PRIMARY KEY (sys_id),
KEY idx3 (ugroup),
KEY idx4 (user)
) ENGINE=MyISAM;

CREATE TABLE t3 (
type mediumtext,
sys_id char(32),
PRIMARY KEY (sys_id)
) ENGINE=MyISAM;

--disable_query_log

INSERT INTO t1 VALUES
('e5d9f63237232000158bbfc8bcbe5dbf','f304ae0037332000158bbfc8bcbe5d4f',
'5398c0e037003000158bbfc8bcbe5dbb'),
('69d9f63237232000158bbfc8bcbe5dcb','7172ea0037332000158bbfc8bcbe5db6',
'5c188ca037003000158bbfc8bcbe5dbc'),
('577ed708d773020058c92cf65e61037a','699708d4d773020058c92cf65e61037c',
'623a8cd4d773020058c92cf65e6103ea'),
('96fb652637232000158bbfc8bcbe5db4','df50316637232000158bbfc8bcbe5d23',
'6835bd6637232000158bbfc8bcbe5d21'),
('e1d9f63237232000158bbfc8bcbe5db8','96346e0037332000158bbfc8bcbe5daa',
'697880e037003000158bbfc8bcbe5dcd'),
('25d9f63237232000158bbfc8bcbe5dbe','f304ae0037332000158bbfc8bcbe5d4f',
'6a9804e037003000158bbfc8bcbe5d09'),
('96fb652637232000158bbfc8bcbe5db4','e08fad2637232000158bbfc8bcbe5d39',
'6d25f96637232000158bbfc8bcbe5d79'),
('e9d9f63237232000158bbfc8bcbe5dc6','7172ea0037332000158bbfc8bcbe5db6',
'702880e037003000158bbfc8bcbe5d94'),
('a5d9f63237232000158bbfc8bcbe5dca','f304ae0037332000158bbfc8bcbe5d4f',
'7188c0e037003000158bbfc8bcbe5d75'),
('65d9f63237232000158bbfc8bcbe5dc4','f304ae0037332000158bbfc8bcbe5d4f',
'778880e037003000158bbfc8bcbe5d9e'),
('a1d9f63237232000158bbfc8bcbe5dc3','7172ea0037332000158bbfc8bcbe5db6',
'7d0840e037003000158bbfc8bcbe5dde'),
('21d9f63237232000158bbfc8bcbe5db7','96346e0037332000158bbfc8bcbe5daa',
'7f6880e037003000158bbfc8bcbe5da7'),
('96fb652637232000158bbfc8bcbe5db4','ec70316637232000158bbfc8bcbe5d60',
'8025f96637232000158bbfc8bcbe5dd0'),
('3dd9f63237232000158bbfc8bcbe5dcc','7172ea0037332000158bbfc8bcbe5db6',
'823880e037003000158bbfc8bcbe5ded'),
('96fb652637232000158bbfc8bcbe5db4','7b10fd2637232000158bbfc8bcbe5d30',
'9a353d6637232000158bbfc8bcbe5dee'),
('75d9f63237232000158bbfc8bcbe5dd0','ebb4620037332000158bbfc8bcbe5d89',
'a558c0e037003000158bbfc8bcbe5d36'),
('6dd9f63237232000158bbfc8bcbe5db5','96346e0037332000158bbfc8bcbe5daa',
'bc78cca037003000158bbfc8bcbe5d74'),
('add9f63237232000158bbfc8bcbe5dc7','7172ea0037332000158bbfc8bcbe5db6',
'c53804a037003000158bbfc8bcbe5db8'),
('fdd9f63237232000158bbfc8bcbe5dcd','7864ae0037332000158bbfc8bcbe5db8',
'cfe740e037003000158bbfc8bcbe5de8'),
('96fb652637232000158bbfc8bcbe5db4','3120fd2637232000158bbfc8bcbe5d42',
'e2257d6637232000158bbfc8bcbe5ded'),
('3c3725e237232000158bbfc8bcbe5da1','96346e0037332000158bbfc8bcbe5daa',
'ee78c0e037003000158bbfc8bcbe5db5'),
('a9d9f63237232000158bbfc8bcbe5dc0','7172ea0037332000158bbfc8bcbe5db6',
'f00888a037003000158bbfc8bcbe5dd3'),
('29d9f63237232000158bbfc8bcbe5db9','7172ea0037332000158bbfc8bcbe5db6',
'fa0880e037003000158bbfc8bcbe5d70'),
('b1d9f63237232000158bbfc8bcbe5dcf','ebb4620037332000158bbfc8bcbe5d89',
'fa48c0e037003000158bbfc8bcbe5d28');

INSERT INTO t2 VALUES
('17801ac21b13200050fdfbcd2c0713e8','8e826bf03710200044e0bfc8bcbe5d86',
'14c19a061b13200050fdfbcd2c07134b'),
('577ed708d773020058c92cf65e61037a','931644d4d773020058c92cf65e61034c',
'339888d4d773020058c92cf65e6103aa'),
('df50316637232000158bbfc8bcbe5d23','92826bf03710200044e0bfc8bcbe5da9',
'3682f56637232000158bbfc8bcbe5d44'),
('b4f342b237232000158bbfc8bcbe5def','86826bf03710200044e0bfc8bcbe5d70',
'38e4c2b237232000158bbfc8bcbe5dea'),
('7b10fd2637232000158bbfc8bcbe5d30','8a826bf03710200044e0bfc8bcbe5d72',
'4442b56637232000158bbfc8bcbe5d43'),
('3120fd2637232000158bbfc8bcbe5d42','82826bf03710200044e0bfc8bcbe5d89',
'49d2396637232000158bbfc8bcbe5d12'),
('96fb652637232000158bbfc8bcbe5db4','86826bf03710200044e0bfc8bcbe5d79',
'4e3ca52637232000158bbfc8bcbe5d3e'),
('17801ac21b13200050fdfbcd2c0713e8','824fd523bf4320007a6d257b3f073963',
'58c19a061b13200050fdfbcd2c07134e'),
('699708d4d773020058c92cf65e61037c','901784d4d773020058c92cf65e6103da',
'5bc708d4d773020058c92cf65e6103d5'),
('75d9f63237232000158bbfc8bcbe5dd0','86826bf03710200044e0bfc8bcbe5d79',
'6b52cb7237232000158bbfc8bcbe5ded'),
('f253da061b13200050fdfbcd2c0713ab','8e826bf03710200044e0bfc8bcbe5d86',
'81045e061b13200050fdfbcd2c071373'),
('7b10fd2637232000158bbfc8bcbe5d30','8e826bf03710200044e0bfc8bcbe5d74',
'8c42b56637232000158bbfc8bcbe5d3f'),
('e5d9f63237232000158bbfc8bcbe5dbf','7a826bf03710200044e0bfc8bcbe5df5',
'a7acfe3237232000158bbfc8bcbe5d78'),
('8a5055c9c61122780043563ef53438e3','9ee1b13dc6112271007f9d0efdb69cd0',
'a9aff553c6112276015a8006174bee21'),
('8a4dde73c6112278017a6a4baf547aa7','9ee1b13dc6112271007f9d0efdb69cd0',
'a9b2f526c61122760003ae07349d294f'),
('aaccc971c0a8001500fe1ff4302de101','9ee1b13dc6112271007f9d0efdb69cd0',
'aacceed3c0a80015009069bba51c4e21'),
('65d9f63237232000158bbfc8bcbe5dc4','8d56406a0a0a0a6b004070b354aada28',
'ac1bfa3237232000158bbfc8bcbe5dc3'),
('b85d44954a3623120004689b2d5dd60a','97000fcc0a0a0a6e0104ca999f619e5b',
'b77bc032cbb00200d71cb9c0c24c9c45'),
('220f8e71c61122840197e57c33464f70','8d56406a0a0a0a6b004070b354aada28',
'b9b74f080a0a0b343ba75b95bdb27056'),
('e08fad2637232000158bbfc8bcbe5d39','82826bf03710200044e0bfc8bcbe5d80',
'be02756637232000158bbfc8bcbe5d8b'),
('ebb4620037332000158bbfc8bcbe5d89','7682abf03710200044e0bfc8bcbe5d25',
'c0122f4437732000158bbfc8bcbe5d7d'),
('96fb652637232000158bbfc8bcbe5db4','7a82abf03710200044e0bfc8bcbe5d27',
'c23ca52637232000158bbfc8bcbe5d3b'),
('22122b37c611228400f9ff91c857581d','9ee1b13dc6112271007f9d0efdb69cd0',
'd23bbf5dac14641866947512bde59dc5'),
('db53a9290a0a0a650091abebccf833c6','9ee1b13dc6112271007f9d0efdb69cd0',
'db54a0f60a0a0a65002c54dcb72b4f41'),
('e08fad2637232000158bbfc8bcbe5d39','8e826bf03710200044e0bfc8bcbe5d86',
'f602756637232000158bbfc8bcbe5d88'),
('699708d4d773020058c92cf65e61037c','8d59d601d7b3020058c92cf65e6103c2',
'f718a241d7b3020058c92cf65e610332'),
('df50316637232000158bbfc8bcbe5d23','9e826bf03710200044e0bfc8bcbe5da6',
'fe82f56637232000158bbfc8bcbe5d4e'),
('f972d6061b13200050fdfbcd2c0713e5','780395f0df031100a9e78b6c3df2631f',
'ff4395f0df031100a9e78b6c3df2637e');

INSERT INTO t3 VALUES
('87245e061b13200050fdfbcd2c0713cc','7172ea0037332000158bbfc8bcbe5db6'),
('74af88c6c611227d0066386e74dc853d','74ad1ff3c611227d01d25feac2af603f'),
('59e22fb137032000158bbfc8bcbe5d52','75d9f63237232000158bbfc8bcbe5dd0'),
('98906fb137032000158bbfc8bcbe5d65','781da52637232000158bbfc8bcbe5db8'),
('87245e061b13200050fdfbcd2c0713cc','7864ae0037332000158bbfc8bcbe5db8'),
('87245e061b13200050fdfbcd2c0713cc','7b10fd2637232000158bbfc8bcbe5d30'),
('59e22fb137032000158bbfc8bcbe5d52','81a880e037003000158bbfc8bcbe5df8'),
('74af88c6c611227d0066386e74dc853d','8a4cb6d4c61122780043b1642efcd52b'),
('1cb8ab9bff500200158bffffffffff62','8a4dde73c6112278017a6a4baf547aa7'),
('1cb8ab9bff500200158bffffffffff62','8a5055c9c61122780043563ef53438e3'),
('87245e061b13200050fdfbcd2c0713cc','96346e0037332000158bbfc8bcbe5daa'),
('59e22fb137032000158bbfc8bcbe5d52','96fb652637232000158bbfc8bcbe5db4'),
('59e22fb137032000158bbfc8bcbe5d52','a1d9f63237232000158bbfc8bcbe5dc3'),
('59e22fb137032000158bbfc8bcbe5d52','a5d9f63237232000158bbfc8bcbe5dca'),
('1cb8ab9bff500200158bffffffffff62','a715cd759f2002002920bde8132e7018'),
('59e22fb137032000158bbfc8bcbe5d52','a9d9f63237232000158bbfc8bcbe5dc0'),
('74af88c6c611227d0066386e74dc853d','aacb62e2c0a80015007f67f752c2b12c'),
('74af88c6c611227d0066386e74dc853d','aaccc971c0a8001500fe1ff4302de101'),
('59e22fb137032000158bbfc8bcbe5d52','add9f63237232000158bbfc8bcbe5dbb'),
('59e22fb137032000158bbfc8bcbe5d52','add9f63237232000158bbfc8bcbe5dc7'),
('59e22fb137032000158bbfc8bcbe5d52','b1d9f63237232000158bbfc8bcbe5dcf'),
('1cb8ab9bff500200158bffffffffff62','b85d44954a3623120004689b2d5dd60a'),
('1cb8ab9bff500200158bffffffffff62','b97e89b94a36231201676b73322a0311'),
('1cb8ab9bff500200158bffffffffff62','cfcbad03d711110050f5edcb9e61038f'),
('1cb8ab9bff500200158bffffffffff62','d625dccec0a8016700a222a0f7900d06'),
('1cb8ab9bff500200158bffffffffff62','db53580b0a0a0a6501aa37c294a2ba6b'),
('1cb8ab9bff500200158bffffffffff62','db53a9290a0a0a650091abebccf833c6'),
('1cb8ab9bff500200158bffffffffff62','dc0db135c332010016194ffe5bba8f23'),
('87245e061b13200050fdfbcd2c0713cc','df50316637232000158bbfc8bcbe5d23'),
('87245e061b13200050fdfbcd2c0713cc','e08fad2637232000158bbfc8bcbe5d39'),
('59e22fb137032000158bbfc8bcbe5d52','e1d9f63237232000158bbfc8bcbe5db8'),
('59e22fb137032000158bbfc8bcbe5d52','e5d9f63237232000158bbfc8bcbe5db4'),
('59e22fb137032000158bbfc8bcbe5d52','e5d9f63237232000158bbfc8bcbe5dbf'),
('59e22fb137032000158bbfc8bcbe5d52','e9d9f63237232000158bbfc8bcbe5dba'),
('59e22fb137032000158bbfc8bcbe5d52','e9d9f63237232000158bbfc8bcbe5dc6'),
('87245e061b13200050fdfbcd2c0713cc','ebb4620037332000158bbfc8bcbe5d89'),
('87245e061b13200050fdfbcd2c0713cc','ec70316637232000158bbfc8bcbe5d60'),
('87245e061b13200050fdfbcd2c0713cc','f253da061b13200050fdfbcd2c0713ab'),
('87245e061b13200050fdfbcd2c0713cc','f304ae0037332000158bbfc8bcbe5d4f'),
('98906fb137032000158bbfc8bcbe5d65','f972d6061b13200050fdfbcd2c0713e5'),
('59e22fb137032000158bbfc8bcbe5d52','fdd9f63237232000158bbfc8bcbe5dcd');

--enable_query_log

let $q=
SELECT t1.assignment_group
FROM t1, t3
WHERE t1.assignment_group = t3.sys_id AND
t1.dispatch_group IN
(SELECT t2.ugroup
FROM t2, t3 t3_i
WHERE t2.ugroup = t3_i.sys_id AND
t3_i.type LIKE '59e22fb137032000158bbfc8bcbe5d52' AND
t2.user = '86826bf03710200044e0bfc8bcbe5d79');

set optimizer_switch='materialization=off';
eval explain $q;
eval $q;

set optimizer_switch='materialization=on';
eval explain $q;
eval $q;

DROP TABLE t1,t2,t3;
set optimizer_switch=@save_optimizer_switch;

--echo # End of 5.5 tests
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