1 files changed, 61 insertions, 0 deletions
diff --git a/mysql-test/main/multi_update_tiny_hash.test b/mysql-test/main/multi_update_tiny_hash.test
new file mode 100644
index 00000000000..10d469fb076
--- /dev/null
+++ b/mysql-test/main/multi_update_tiny_hash.test
@@ -0,0 +1,61 @@
+#
+# Test of update statement that uses many tables,
+# --max_heap_table_size=1
+#
+
+--disable_warnings
+drop table if exists t1, t2;
+--enable_warnings
+
+--echo #
+--echo # Bug #36676: multiupdate using LEFT JOIN updates only
+--echo #             first row or fails with an error:
+--echo #  ERROR 1022 (23000): Can't write; duplicate key in table ''
+--echo #
+
+--echo
+
+--echo #
+--echo # Multiupdate creates MyISAM temporary table without MEMORY table
+--echo #
+
+CREATE TABLE t1 (ID INT);
+CREATE TABLE t2 (ID INT,
+  s1 TEXT, s2 TEXT, s3 VARCHAR(10), s4 TEXT, s5 VARCHAR(10));
+
+INSERT INTO t1 VALUES (1),(2);
+INSERT INTO t2 VALUES (1,'test', 'test', 'test', 'test', 'test'),
+                      (2,'test', 'test', 'test', 'test', 'test');
+
+SELECT * FROM t1 LEFT JOIN t2 USING(ID);
+UPDATE t1 LEFT JOIN t2 USING(ID) SET s1 = 'changed';
+UPDATE t1 JOIN t2 USING(ID) SET s2 = 'changed';
+UPDATE t1 LEFT JOIN t2 USING(ID) SET s3 = 'changed';
+UPDATE t1 LEFT JOIN t2 USING(ID) SET s4 = 'changed', s5 = 'changed';
+SELECT * FROM t1 LEFT JOIN t2 USING(ID); 
+
+DROP TABLE t1, t2;
+
+--echo #
+--echo # Multiupdate creates temporary MyISAM table from MEMORY table
+--echo #
+
+CREATE TABLE t1 (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY);
+CREATE TABLE t2 (id INT, s1 CHAR(255));
+
+# insert [1..64] into table `t1`
+INSERT INTO t1 VALUES (0), (0), (0), (0), (0), (0), (0), (0);
+INSERT INTO t1 (SELECT 0 FROM t1);
+INSERT INTO t1 (SELECT 0 FROM t1);
+INSERT INTO t1 (SELECT 0 FROM t1);
+
+INSERT INTO t2 (SELECT ID, 'a' FROM t1);
+
+UPDATE t1 LEFT JOIN t2 USING(id) SET s1 = 'b';
+
+SELECT DISTINCT s1 FROM t1 LEFT JOIN t2 USING(id);
+
+DROP TABLE t1, t2;
+
+
+--echo # End of 5.0 tests