From 73be194f966428646ed13eea0c7b73034cff9f8b Mon Sep 17 00:00:00 2001
From: "igor@rurik.mysql.com" <>
Date: Mon, 8 Aug 2005 16:51:12 -0700
Subject: [PATCH] subselect.test, subselect.result:   Added a test case for bug
 #12392. item_cmpfunc.cc:   Fixed bug #12392.   Missing handling of rows
 containing NULL components   when evaluating IN predicates caused a crash.

---
 mysql-test/r/subselect.result |  6 ++++++
 mysql-test/t/subselect.test   | 11 +++++++++++
 sql/item_cmpfunc.cc           |  2 ++
 3 files changed, 19 insertions(+)

diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index 25d9a39705d..eaacf5ba2d0 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -2742,3 +2742,9 @@ one	two	flag
 5	6	N
 7	8	N
 DROP TABLE t1,t2;
+CREATE TABLE t1 (a char(5), b char(5));
+INSERT INTO t1 VALUES (NULL,'aaa'), ('aaa','aaa');
+SELECT * FROM t1 WHERE (a,b) IN (('aaa','aaa'), ('aaa','bbb'));
+a	b
+aaa	aaa
+DROP TABLE t1;
diff --git a/mysql-test/t/subselect.test b/mysql-test/t/subselect.test
index 0b4791b0023..951dc31006e 100644
--- a/mysql-test/t/subselect.test
+++ b/mysql-test/t/subselect.test
@@ -1770,4 +1770,15 @@ SELECT * FROM t1
 
 DROP TABLE t1,t2;
 
+#
+# Bug #12392: where cond with IN predicate for rows and NULL values in table 
+#
+
+CREATE TABLE t1 (a char(5), b char(5));
+INSERT INTO t1 VALUES (NULL,'aaa'), ('aaa','aaa');
+
+SELECT * FROM t1 WHERE (a,b) IN (('aaa','aaa'), ('aaa','bbb'));
+
+DROP TABLE t1;
+
 # End of 4.1 tests
diff --git a/sql/item_cmpfunc.cc b/sql/item_cmpfunc.cc
index f24638d1a93..9146b3c3b9e 100644
--- a/sql/item_cmpfunc.cc
+++ b/sql/item_cmpfunc.cc
@@ -1551,6 +1551,8 @@ in_row::~in_row()
 byte *in_row::get_value(Item *item)
 {
   tmp.store_value(item);
+  if (item->is_null())
+    return 0;
   return (byte *)&tmp;
 }