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MDEV-5037: Server crash on a JOIN on a derived table with join_cache_level > 2

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- The crash was caused because the optimizer called handler->multi_range_read_info()
  on a derived temporary table.  That table has been created, but not opened yet.
  Because of that, handler::table was NULL, which caused crash.
  Fixed by changing DS-MRR methods to use handler::table_share instead. 
  handler::table_share is set in handler ctor, so this should be safe.
This commit is contained in:
Sergey Petrunya 2013-09-20 14:47:38 +04:00
commit 422c55a240
6 changed files with 65 additions and 12 deletions
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23
mysql-test/r/innodb_mrr_cpk.result
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@ -171,3 +171,26 @@ a b c d e g
2 6 two 12 2 6
DROP TABLE t1, t2;
set optimizer_switch=@tmp_mdev3817;
#
# MDEV-5037: Server crash on a JOIN on a derived table with join_cache_level > 2
#
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t1 (
id char(8) CHARACTER SET utf8 NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE t2 (
id char(8) CHARACTER SET utf8 DEFAULT NULL,
url text CHARACTER SET utf8
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
insert into t1 select '03b2ca8c' from t0 A, t0 B limit 80;
insert into t2 select '03b2ca8c','' from t0 A, t0 B, t0 C;
set @tmp_mdev5037=@@join_cache_level;
set join_cache_level=3;
explain SELECT 1 FROM (SELECT url, id FROM t2 LIMIT 1 OFFSET 20) derived RIGHT JOIN t1 ON t1.id = derived.id;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL #
1 PRIMARY <derived2> hash_ALL key0 #hash#key0 25 test.t1.id # Using join buffer (flat, BNLH join)
2 DERIVED t2 ALL NULL NULL NULL NULL #
set join_cache_level= @tmp_mdev5037;
drop table t0,t1,t2;