5.1 -> 5.5 merge

mysql-test/r/func_time.result

@@ -1353,6 +1353,18 @@ DROP TABLE t1;
 SELECT STR_TO_DATE(SPACE(2),'1');
 STR_TO_DATE(SPACE(2),'1')
 0000-00-00
+#
+# Bug#11765216  58154: UNINITIALIZED VARIABLE FORMAT IN STR_TO_DATE FUNCTION
+#
+SET GLOBAL SQL_MODE='';
+DO  STR_TO_DATE((''), FROM_DAYS(@@GLOBAL.SQL_MODE));
+SET GLOBAL SQL_MODE=DEFAULT;
+#
+# Bug#11766087  59125: VALGRIND UNINITIALISED VALUE WARNING IN ULL2DEC, LONGLONG2DECIMAL
+#
+SELECT FORMAT(YEAR(STR_TO_DATE('',GET_FORMAT(TIME,''))),1);
+FORMAT(YEAR(STR_TO_DATE('',GET_FORMAT(TIME,''))),1)
+NULL
 End of 5.1 tests
 #
 # Bug#57039: constant subtime expression returns incorrect result.

mysql-test/t/func_time.test

@@ -868,6 +868,20 @@ DROP TABLE t1;
 
 SELECT STR_TO_DATE(SPACE(2),'1');
 
+--echo #
+--echo # Bug#11765216  58154: UNINITIALIZED VARIABLE FORMAT IN STR_TO_DATE FUNCTION
+--echo #
+
+SET GLOBAL SQL_MODE='';
+DO  STR_TO_DATE((''), FROM_DAYS(@@GLOBAL.SQL_MODE));
+SET GLOBAL SQL_MODE=DEFAULT;
+
+--echo #
+--echo # Bug#11766087  59125: VALGRIND UNINITIALISED VALUE WARNING IN ULL2DEC, LONGLONG2DECIMAL
+--echo #
+
+SELECT FORMAT(YEAR(STR_TO_DATE('',GET_FORMAT(TIME,''))),1);
+
 --echo End of 5.1 tests
 
 --echo #

sql/item_func.cc

@@ -505,7 +505,10 @@ bool Item_func::is_expensive_processor(uchar *arg)
 my_decimal *Item_func::val_decimal(my_decimal *decimal_value)
 {
   DBUG_ASSERT(fixed);
-  int2my_decimal(E_DEC_FATAL_ERROR, val_int(), unsigned_flag, decimal_value);
+  longlong nr= val_int();
+  if (null_value)
+    return 0; /* purecov: inspected */
+  int2my_decimal(E_DEC_FATAL_ERROR, nr, unsigned_flag, decimal_value);
   return decimal_value;
 }
 

sql/item_timefunc.cc

@@ -3405,6 +3405,7 @@ void Item_func_str_to_date::fix_length_and_dec()
 {
   maybe_null= 1;
   decimals=0;
+  cached_format_type= DATE_TIME;
   cached_field_type= MYSQL_TYPE_DATETIME;
   max_length= MAX_DATETIME_FULL_WIDTH*MY_CHARSET_BIN_MB_MAXLEN;
   cached_timestamp_type= MYSQL_TIMESTAMP_NONE;