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mysql-test/r/update.result

@@ -503,3 +503,14 @@ ERROR HY000: Recursive stored functions and triggers are not allowed.
 DROP TABLE t1;
 DROP FUNCTION f1;
 End of 5.0 tests
+#
+# Bug #47919 assert in open_table during ALTER temporary table
+#
+CREATE TABLE t1 (f1 INTEGER AUTO_INCREMENT, PRIMARY KEY (f1));
+CREATE TEMPORARY TABLE t2 LIKE t1;
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (1);
+ALTER TABLE t2 COMMENT = 'ABC';
+UPDATE t2, t1 SET t2.f1 = 2, t1.f1 = 9;
+ALTER TABLE t2 COMMENT = 'DEF';
+DROP TABLE t1, t2;

mysql-test/t/update.test

@@ -452,3 +452,18 @@ DROP TABLE t1;
 DROP FUNCTION f1;
 
 --echo End of 5.0 tests
+
+--echo #
+--echo # Bug #47919 assert in open_table during ALTER temporary table
+--echo #
+
+CREATE TABLE t1 (f1 INTEGER AUTO_INCREMENT, PRIMARY KEY (f1));
+CREATE TEMPORARY TABLE t2 LIKE t1;
+INSERT INTO t1 VALUES (1);
+INSERT INTO t2 VALUES (1);
+
+ALTER TABLE t2 COMMENT = 'ABC';
+UPDATE t2, t1 SET t2.f1 = 2, t1.f1 = 9;
+ALTER TABLE t2 COMMENT = 'DEF';
+
+DROP TABLE t1, t2;

sql/sql_update.cc

@@ -1696,6 +1696,11 @@ bool multi_update::send_data(List<Item> &not_used_values)
                                                TRG_EVENT_UPDATE))
 	DBUG_RETURN(1);
 
+      /*
+        Reset the table->auto_increment_field_not_null as it is valid for
+        only one row.
+      */
+      table->auto_increment_field_not_null= FALSE;
       found++;
       if (!can_compare_record || compare_record(table))
       {