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Fixed mdev-14960 [ERROR] mysqld got signal 11 with join_buffer and join_cache

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In the function JOIN::shrink_join_buffers the iteration over joined
tables was organized in a wrong way. This could cause a crash if
the optimizer chose to materialize a semi-join that used join caches
for which the sizes must be adjusted.
This commit is contained in:
Igor Babaev
2018-01-18 09:20:55 -08:00
parent fafdac3365
commit 4f96b401d9
3 changed files with 107 additions and 1 deletions
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45
mysql-test/t/join_cache.test
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@ -3791,5 +3791,50 @@ set join_cache_level = default;
DROP TABLE t1,t2;
--echo #
--echo # MDEV-14960: BNLH used for materialized semi-join
--echo #
CREATE TABLE t1 (i1 int);
CREATE TABLE t2 (e1 int);
CREATE TABLE t4 (e1 int);
CREATE TABLE t5 (e1 int);
INSERT INTO t1 VALUES
(1),(2),(3),(4),(5),(6),(7),(8);
INSERT INTO t1 SELECT i1+8 FROM t1;
INSERT INTO t1 SELECT i1+16 FROM t1;
INSERT INTO t1 SELECT i1+32 FROM t1;
INSERT INTO t1 SELECT i1+64 FROM t1;
INSERT INTO t2 SELECT * FROM t1;
INSERT INTO t4 SELECT * FROM t1;
INSERT INTO t5 SELECT * FROM t1;
set @save_optimizer_switch= @@optimizer_switch;
SET join_cache_level = 6;
SET join_buffer_size=4096;
SET join_buffer_space_limit=4096;
SET optimizer_switch = 'join_cache_hashed=on,optimize_join_buffer_size=on';
let $q=
SELECT * FROM t1
WHERE
i1 < 10 AND
i1 IN
(SELECT i1 FROM
(SELECT (t4.e1) i1 FROM t4
LEFT JOIN t5 ON t4.e1 = t5.e1
LEFT JOIN (SELECT e1 FROM t2 ) AS d ON t4.e1 = d.e1) a);
eval EXPLAIN $q;
eval $q;
SET join_cache_level = default;
SET join_buffer_size = default;
SET join_buffer_space_limit= default;
set optimizer_switch=@save_optimizer_switch;
DROP TABLE t1,t4,t5,t2;
# this must be the last command in the file
set @@optimizer_switch=@save_optimizer_switch;