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BUG#723822: Crash in get_constant_key_infix with EXISTS ( SELECT .. DISTINCT )

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- Make get_constant_key_infix() take into account that there may be SEL_TREEs with
  type=SEL_ARG::MAYBE_KEY, which it cannot process, because they are not real ranges
  but rather indications that we might have been able to construct a range if we had
  values for some other tables' fields. 
  (check_quick_select() already has such check)
This commit is contained in:
Sergey Petrunya 2011-02-25 21:43:57 +03:00
parent 22e1ee5f5f
commit 0f265b8251
3 changed files with 41 additions and 1 deletions
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18
mysql-test/r/subselect4.result
View file

@ -689,3 +689,21 @@ id select_type table type possible_keys key key_len ref rows Extra
2 DEPENDENT SUBQUERY X ALL NULL NULL NULL NULL 10
2 DEPENDENT SUBQUERY B ALL a,b NULL NULL NULL 1000 Range checked for each record (index map: 0x3)
drop table t1, t2;
#
# BUG#723822: Crash in get_constant_key_infix with EXISTS ( SELECT .. DISTINCT )
#
CREATE TABLE t1 ( f1 int(11), f3 varchar(1)) ;
INSERT INTO t1 VALUES ('8','c'),('5','f');
ALTER TABLE t1 ADD KEY (f3,f1);
CREATE TABLE t2 ( f4 varchar(1)) ;
INSERT INTO t2 VALUES ('f'),('d');
SELECT * FROM t2
WHERE EXISTS (
SELECT DISTINCT f3
FROM t1
WHERE f3 <= t2.f4
);
f4
f
d
drop table t1,t2;

21
mysql-test/t/subselect4.test
View file

@ -619,3 +619,24 @@ select a,
from t1 A;
drop table t1, t2;
--echo #
--echo # BUG#723822: Crash in get_constant_key_infix with EXISTS ( SELECT .. DISTINCT )
--echo #
CREATE TABLE t1 ( f1 int(11), f3 varchar(1)) ;
INSERT INTO t1 VALUES ('8','c'),('5','f');
ALTER TABLE t1 ADD KEY (f3,f1);
CREATE TABLE t2 ( f4 varchar(1)) ;
INSERT INTO t2 VALUES ('f'),('d');
SELECT * FROM t2
WHERE EXISTS (
SELECT DISTINCT f3
FROM t1
WHERE f3 <= t2.f4
);
drop table t1,t2;

3
sql/opt_range.cc
View file

@ -11857,7 +11857,8 @@ get_constant_key_infix(KEY *index_info, SEL_ARG *index_range_tree,
Find the range tree for the current keypart. We assume that
index_range_tree points to the leftmost keypart in the index.
*/
for (cur_range= index_range_tree; cur_range;
for (cur_range= index_range_tree;
cur_range && cur_range->type == SEL_ARG::KEY_RANGE;
cur_range= cur_range->next_key_part)
{
if (cur_range->field->eq(cur_part->field))