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Commit 5412e82c authored by unknown's avatar unknown
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Fixed LP BUG#747278 

The problem was that when we have single row subquery with no rows
Item_cache(es) which represent result row was not null and being
requested via element_index() returned random value.

The fix is setting all Item_cache(es) in NULL before executing the
query (reset() method) which guaranty NULL value of whole query
or its elements requested in any way if no rows was found.

set_null() method was added to Item_cache to guaranty correct NULL
value in case of reseting the cache.
parent 17b4e4a1
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Showing with 491 additions and 1 deletion
mysql-test/r/subselect.result
View file @ 5412e82c
......@@ -5734,4 +5734,85 @@ SELECT 't'
b a b
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
#
# LP BUG#747278 incorrect values of the NULL (no rows) single
# row subquery requested via element_index() interface
#
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
set @@session.optimizer_switch=@old_optimizer_switch;
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
select (null, null) = (null, null);
(null, null) = (null, null)
NULL
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
(SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0)
NULL
drop tables t1,t2,t3;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
mysql-test/r/subselect_no_mat.result
View file @ 5412e82c
......@@ -5733,6 +5733,87 @@ SELECT 't'
b a b
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
#
# LP BUG#747278 incorrect values of the NULL (no rows) single
# row subquery requested via element_index() interface
#
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
set @@session.optimizer_switch=@old_optimizer_switch;
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
select (null, null) = (null, null);
(null, null) = (null, null)
NULL
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
(SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0)
NULL
drop tables t1,t2,t3;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set optimizer_switch=default;
select @@optimizer_switch like '%materialization=on%';
......
mysql-test/r/subselect_no_opts.result
View file @ 5412e82c
......@@ -5729,5 +5729,86 @@ SELECT 't'
b a b
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
#
# LP BUG#747278 incorrect values of the NULL (no rows) single
# row subquery requested via element_index() interface
#
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
set @@session.optimizer_switch=@old_optimizer_switch;
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
select (null, null) = (null, null);
(null, null) = (null, null)
NULL
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
(SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0)
NULL
drop tables t1,t2,t3;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set @optimizer_switch_for_subselect_test=null;
mysql-test/r/subselect_no_scache.result
View file @ 5412e82c
......@@ -5738,6 +5738,87 @@ SELECT 't'
b a b
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
#
# LP BUG#747278 incorrect values of the NULL (no rows) single
# row subquery requested via element_index() interface
#
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
set @@session.optimizer_switch=@old_optimizer_switch;
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
select (null, null) = (null, null);
(null, null) = (null, null)
NULL
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
(SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0)
NULL
drop tables t1,t2,t3;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set optimizer_switch=default;
select @@optimizer_switch like '%subquery_cache=on%';
......
mysql-test/r/subselect_no_semijoin.result
View file @ 5412e82c
......@@ -5729,5 +5729,86 @@ SELECT 't'
b a b
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
#
# LP BUG#747278 incorrect values of the NULL (no rows) single
# row subquery requested via element_index() interface
#
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
set @@session.optimizer_switch=@old_optimizer_switch;
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1)
NULL
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
(SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
(SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
NULL
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
(SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1)
NULL
select (null, null) = (null, null);
(null, null) = (null, null)
NULL
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
(SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0)
NULL
drop tables t1,t2,t3;
# return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
set @optimizer_switch_for_subselect_test=null;
mysql-test/t/subselect.test
View file @ 5412e82c
......@@ -4840,4 +4840,49 @@ WHERE t2.b IN (
set @@join_cache_level= @save_join_cache_level;
drop table t1,t2;
--echo #
--echo # LP BUG#747278 incorrect values of the NULL (no rows) single
--echo # row subquery requested via element_index() interface
--echo #
CREATE TABLE t1 (f1a int, f1b int) ;
INSERT IGNORE INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 ( f2 int);
INSERT IGNORE INTO t2 VALUES (3),(4);
CREATE TABLE t3 (f3a int default 1, f3b int default 2);
INSERT INTO t3 VALUES (1,1),(2,2);
# check different IN with switches where the bug was found
set @old_optimizer_switch = @@session.optimizer_switch;
set @@optimizer_switch='materialization=on,partial_match_rowid_merge=on,partial_match_table_scan=off,subquery_cache=off,semijoin=off';
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
set @@session.optimizer_switch=@old_optimizer_switch;
# check different IN with default switches
SELECT (SELECT f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) NOT IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) NOT IN (SELECT f1a, f1b FROM t1);
SELECT (SELECT f3a FROM t3 where f3a > 3) IN (SELECT f1a FROM t1) FROM t2;
SELECT (SELECT f3a,f3a FROM t3 where f3a > 3) IN (SELECT f1a,f1a FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1) FROM t2;
SELECT (SELECT f3a, f3b FROM t3 where f3a > 3) IN (SELECT f1a, f1b FROM t1);
# other row operation with NULL single row subquery also should work
select (null, null) = (null, null);
SELECT (SELECT f3a, f3a FROM t3 where f3a > 3) = (0, 0);
drop tables t1,t2,t3;
--echo # return optimizer switch changed in the beginning of this test
set optimizer_switch=@subselect_tmp;
sql/item.cc
View file @ 5412e82c
......@@ -8201,6 +8201,20 @@ void Item_cache::print(String *str, enum_query_type query_type)
str->append(')');
}
/**
Assign to this cache NULL value if it is possible
*/
void Item_cache::set_null()
{
if (maybe_null)
{
null_value= TRUE;
value_cached= TRUE;
}
}
bool Item_cache_int::cache_value()
{
if (!example)
......@@ -8671,6 +8685,20 @@ void Item_cache_row::bring_value()
}
/**
Assign to this cache NULL value if it is possible
*/
void Item_cache_row::set_null()
{
Item_cache::set_null();
if (!values)
return;
for (uint i= 0; i < item_count; i++)
values[i]->set_null();
};
Item_type_holder::Item_type_holder(THD *thd, Item *item)
:Item(thd, item), enum_set_typelib(0), fld_type(get_real_type(item))
{
......
sql/item.h
View file @ 5412e82c
......@@ -3651,6 +3651,7 @@ class Item_cache: public Item_basic_constant
return false;
return example->is_expensive_processor(arg);
}
virtual void set_null();
};
......@@ -3825,6 +3826,7 @@ class Item_cache_row: public Item_cache
DBUG_VOID_RETURN;
}
bool cache_value();
virtual void set_null();
};
......
sql/item_subselect.cc
View file @ 5412e82c
......@@ -893,7 +893,10 @@ void Item_singlerow_subselect::reset()
{
Item_subselect::reset();
if (value)
value->null_value= TRUE;
{
for(uint i= 0; i < engine->cols(); i++)
row[i]->set_null();
}
}
......@@ -1004,6 +1007,11 @@ void Item_singlerow_subselect::fix_length_and_dec()
*/
if (engine->no_tables())
maybe_null= engine->may_be_null();
else
{
for (uint i= 0; i < max_columns; i++)
row[i]->maybe_null= TRUE;
}
}
......
sql/sql_view.cc
View file @ 5412e82c
......@@ -1691,6 +1691,8 @@ frm_type_enum mysql_frm_type(THD *thd, char *path, enum legacy_db_type *dbt)
*dbt= DB_TYPE_UNKNOWN;
if ((file= my_open(path, O_RDONLY | O_SHARE, MYF(0))) < 0)
DBUG_RETURN(FRMTYPE_ERROR);
error= my_read(file, (uchar*) header, sizeof(header), MYF(MY_NABP));
......
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