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MDEV-10729: Server crashes in st_select_lex::set_explain_type

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Make the new (CTE-related) code in set_explain_type to take into
account that some JOIN_TABs are non-merged semi-joins, and do not
have a TABLE object.
This commit is contained in:
Sergei Petrunia
2016-09-07 17:09:29 +03:00
parent a032fd5c1c
commit 95b8dcbd43
3 changed files with 34 additions and 1 deletions
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15
mysql-test/r/cte_nonrecursive.result
View File

@@ -880,3 +880,18 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
DROP TABLE t1,t2,t3;
#
# MDEV-10729: Server crashes in st_select_lex::set_explain_type
#
CREATE TABLE t1 (i1 INT, KEY(i1)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4),(8);
CREATE TABLE t2 (a2 INT, b2 INT, KEY(b2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (8,7);
CREATE TABLE t3 (i3 INT) ENGINE=MyISAM;
INSERT INTO t3 VALUES (2),(6);
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
UNION
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
;
i1 a2 b2
DROP TABLE t1,t2,t3;

18
mysql-test/t/cte_nonrecursive.test
View File

@@ -558,3 +558,21 @@ INSERT INTO t3 VALUES (1),(2),(3);
EXPLAIN SELECT * FROM (WITH a AS (SELECT * FROM t1) (t2 NATURAL JOIN t3));
explain SELECT * FROM (WITH a AS (SELECT * FROM t1) SELECT * FROM t2 NATURAL JOIN t3) AS d1;
DROP TABLE t1,t2,t3;
--echo #
--echo # MDEV-10729: Server crashes in st_select_lex::set_explain_type
--echo #
CREATE TABLE t1 (i1 INT, KEY(i1)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (4),(8);
CREATE TABLE t2 (a2 INT, b2 INT, KEY(b2)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (8,7);
CREATE TABLE t3 (i3 INT) ENGINE=MyISAM;
INSERT INTO t3 VALUES (2),(6);
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
UNION
SELECT * FROM t1, t2 WHERE a2 = i1 and b2 >= i1 AND i1 IN ( SELECT i3 FROM t3 )
;
DROP TABLE t1,t2,t3;

2
sql/sql_lex.cc
View File

@@ -4370,7 +4370,7 @@ void st_select_lex::set_explain_type(bool on_the_fly)
for (JOIN_TAB *tab= first_explain_order_tab(join); tab;
tab= next_explain_order_tab(join, tab))
{
if (tab->table->pos_in_table_list->with)
if (tab->table && tab->table->pos_in_table_list->with)
{
uses_cte= true;
break;