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This commit is contained in:
Georgi Kodinov 2009-09-08 12:37:09 +03:00
commit 3ec517416b
3 changed files with 64 additions and 6 deletions
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30
mysql-test/r/subselect4.result Normal file
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@ -0,0 +1,30 @@
#
# Bug #46791: Assertion failed:(table->key_read==0),function unknown
# function,file sql_base.cc
#
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,1),(2,2);
CREATE TABLE t3 LIKE t1;
# should have 1 impossible where and 2 dependent subqueries
EXPLAIN
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index NULL a 5 NULL 2 Using index; Using temporary
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL no matching row in const table
# should not crash the next statement
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
1
1
# should not crash: the crash is caused by the previous statement
SELECT 1;
1
1
DROP TABLE t1,t2,t3;
End of 5.0 tests.

32
mysql-test/t/subselect4.test Normal file
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@ -0,0 +1,32 @@
# General purpose bug fix tests go here : subselect.test too large
--echo #
--echo # Bug #46791: Assertion failed:(table->key_read==0),function unknown
--echo # function,file sql_base.cc
--echo #
CREATE TABLE t1 (a INT, b INT, KEY(a));
INSERT INTO t1 VALUES (1,1),(2,2);
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 VALUES (1,1),(2,2);
CREATE TABLE t3 LIKE t1;
--echo # should have 1 impossible where and 2 dependent subqueries
EXPLAIN
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
--echo # should not crash the next statement
SELECT 1 FROM t1
WHERE NOT EXISTS (SELECT 1 FROM t2 WHERE 1 = (SELECT MIN(t2.b) FROM t3))
ORDER BY count(*);
--echo # should not crash: the crash is caused by the previous statement
SELECT 1;
DROP TABLE t1,t2,t3;
--echo End of 5.0 tests.

8
sql/sql_select.cc
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@ -1523,12 +1523,8 @@ JOIN::optimize()
}
}
/*
If this join belongs to an uncacheable subquery save
the original join
*/
if (select_lex->uncacheable && !is_top_level_join() &&
init_save_join_tab())
/* If this join belongs to an uncacheable query save the original join */
if (select_lex->uncacheable && init_save_join_tab())
DBUG_RETURN(-1); /* purecov: inspected */
}