Merge of fix for Bug#59173.

mysql-test/r/type_datetime.result

@@ -637,6 +637,17 @@ CAST(CAST('2008-07-29T10:42:51.1234567' AS DateTime) AS DECIMAL(30,7))
 20080729104251.1234560
 Warnings:
 Warning	1292	Truncated incorrect datetime value: '2008-07-29T10:42:51.1234567'
+# 
+# Bug#59173: Failure to handle DATE(TIME) values where Year, Month or
+# Day is ZERO 
+# 
+CREATE TABLE t1 (dt1 DATETIME);
+INSERT INTO t1 (dt1) VALUES ('0000-00-01 00:00:01');
+DELETE   FROM t1 WHERE dt1 = '0000-00-01 00:00:01';
+# Should be empty
+SELECT * FROM t1;
+dt1
+DROP TABLE t1;
 End of 5.1 tests
 #
 # Start of 5.5 tests

mysql-test/t/type_datetime.test

@@ -445,6 +445,17 @@ SELECT CAST(CAST('00000002006-000008-0000010 000010:0000011:00000012.012345'  AS
 # show we truncate microseconds from the right
 SELECT CAST(CAST('2008-07-29T10:42:51.1234567' AS DateTime) AS DECIMAL(30,7));
 
+--echo # 
+--echo # Bug#59173: Failure to handle DATE(TIME) values where Year, Month or
+--echo # Day is ZERO 
+--echo # 
+CREATE TABLE t1 (dt1 DATETIME);
+INSERT INTO t1 (dt1) VALUES ('0000-00-01 00:00:01');
+DELETE   FROM t1 WHERE dt1 = '0000-00-01 00:00:01';
+--echo # Should be empty
+SELECT * FROM t1;
+DROP TABLE t1;
+
 --echo End of 5.1 tests
 
 --echo #

sql/item_cmpfunc.cc

@@ -918,7 +918,7 @@ int Arg_comparator::set_cmp_func(Item_result_field *owner_arg,
         cache_converted_constant can't be used here because it can't
         correctly convert a DATETIME value from string to int representation.
       */
-      Item_cache_int *cache= new Item_cache_int();
+      Item_cache_int *cache= new Item_cache_int(MYSQL_TYPE_DATETIME);
       /* Mark the cache as non-const to prevent re-caching. */
       cache->set_used_tables(1);
       if (!(*a)->is_datetime())