Bug #48709: Assertion failed in sql_select.cc:11782:

 int join_read_key(JOIN_TAB*)

The eq_ref access method TABLE_REF (accessed through 
JOIN_TAB) to save state and to track if this is the 
first row it finds or not.
This state was not reset on subquery re-execution
causing an assert.

Fixed by resetting the state before the subquery 
re-execution.

1 files changed, 25 insertions, 0 deletions

diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index 665473df3ef..f446d8feec3 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -4410,6 +4410,31 @@ WHERE a = 230;
 MAX(b)	(SELECT COUNT(*) FROM st1,st2 WHERE st2.b <= t1.b)
 NULL	0
 DROP TABLE t1, st1, st2;
+#
+# Bug #48709: Assertion failed in sql_select.cc:11782: 
+#   int join_read_key(JOIN_TAB*)
+#
+CREATE TABLE t1 (pk int PRIMARY KEY, int_key int);
+INSERT INTO t1 VALUES (10,1), (14,1);
+CREATE TABLE t2 (pk int PRIMARY KEY, int_key int);
+INSERT INTO t2 VALUES (3,3), (5,NULL), (7,3);
+# should have eq_ref for t1
+EXPLAIN
+SELECT * FROM t2 outr
+WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2)  
+ORDER BY outr.pk;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+x	x	outr	ALL	x	x	x	x	x	x
+x	x	t1	eq_ref	x	x	x	x	x	x
+x	x	t2	index	x	x	x	x	x	x
+# should not crash on debug binaries
+SELECT * FROM t2 outr
+WHERE outr.int_key NOT IN (SELECT t1.pk FROM t1, t2)  
+ORDER BY outr.pk;
+pk	int_key
+3	3
+7	3
+DROP TABLE t1,t2;
 End of 5.0 tests.
 CREATE TABLE t1 (a INT, b INT);
 INSERT INTO t1 VALUES (2,22),(1,11),(2,22);