Additional fix for the bug#27590.

mysql-test/r/ps_6bdb.result

@@ -3053,7 +3053,7 @@ found
 true
 set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
 select 'true' as found from t9 
-where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
+where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
 c14= CAST('1991-01-01 01:01:01' as datetime) and
 c15= CAST('1991-01-01 01:01:01' as datetime) and
 c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3066,7 +3066,7 @@ and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
+where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
   c14= CAST('1991-01-01 01:01:01' as datetime) and
   c15= CAST('1991-01-01 01:01:01' as datetime) and
   c16= CAST('1991-01-01 01:01:01' as datetime) and

mysql-test/r/ps_7ndb.result

@@ -3053,7 +3053,7 @@ found
 true
 set @arg00= CAST('1991-01-01 01:01:01' as datetime) ;
 select 'true' as found from t9 
-where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
+where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
 c14= CAST('1991-01-01 01:01:01' as datetime) and
 c15= CAST('1991-01-01 01:01:01' as datetime) and
 c16= CAST('1991-01-01 01:01:01' as datetime) and
@@ -3066,7 +3066,7 @@ and c17= @arg00 ;
 found
 true
 prepare stmt1 from "select 'true' as found from t9 
-where c1= 20 and c13= CAST('1991-01-01 01:01:01' as datetime) and
+where c1= 20 and c13= CAST('1991-01-01 00:00:00' as datetime) and
   c14= CAST('1991-01-01 01:01:01' as datetime) and
   c15= CAST('1991-01-01 01:01:01' as datetime) and
   c16= CAST('1991-01-01 01:01:01' as datetime) and

sql/item_cmpfunc.cc

@@ -544,7 +544,7 @@ static ulonglong
 get_date_from_str(THD *thd, String *str, timestamp_type warn_type,
                   char *warn_name, bool *error_arg)
 {
-  ulonglong value;
+  ulonglong value= 0;
   int error;
   MYSQL_TIME l_time;
   enum_mysql_timestamp_type ret;
@@ -748,7 +748,7 @@ static ulonglong
 get_datetime_value(THD *thd, Item ***item_arg, Item **cache_arg,
                    Item *warn_item, bool *is_null)
 {
-  ulonglong value;
+  ulonglong value= 0;
   String buf, *str= 0;
   Item *item= **item_arg;
 

tests/mysql_client_test.c

@@ -8785,7 +8785,9 @@ static void test_ts()
   int        rc, field_count;
   char       name;
   char query[MAX_TEST_QUERY_LENGTH];
-
+  const char *queries [3]= {"SELECT a, b, c FROM test_ts WHERE %c=?",
+                            "SELECT a, b, c FROM test_ts WHERE %c=?",
+                            "SELECT a, b, c FROM test_ts WHERE %c=CAST(? AS DATE)"};
   myheader("test_ts");
 
   rc= mysql_query(mysql, "DROP TABLE IF EXISTS test_ts");
@@ -8852,9 +8854,7 @@ static void test_ts()
 
   mysql_free_result(prep_res);
   mysql_stmt_close(stmt);
-  char queries [3][60]= {"SELECT a, b, c FROM test_ts WHERE %c=?",
-                         "SELECT a, b, c FROM test_ts WHERE %c=?",
-                         "SELECT a, b, c FROM test_ts WHERE %c=CAST(? AS DATE)"};
+
   for (name= 'a'; field_count--; name++)
   {
     int row_count= 0;