Bug#53942 valgrind warnings with timestamp() function and incomplete datetime values

Field_time::get_date method does not initialize MYSQL_TIME::time_type field.
The fix is to init this field.

mysql-test/r/type_time.result

@@ -138,3 +138,13 @@ CAST(c AS TIME)
 00:00:00
 DROP TABLE t1;
 End of 5.0 tests
+#
+# Bug#53942 valgrind warnings with timestamp() function and incomplete datetime values
+#
+CREATE TABLE t1(f1 TIME);
+INSERT INTO t1 VALUES ('23:38:57');
+SELECT TIMESTAMP(f1,'1') FROM t1;
+TIMESTAMP(f1,'1')
+NULL
+DROP TABLE t1;
+End of 5.1 tests

mysql-test/t/type_time.test

@@ -88,5 +88,15 @@ INSERT INTO t1 VALUES ('0:00:00');
 SELECT CAST(c AS TIME) FROM t1;
 DROP TABLE t1;
 
-
 --echo End of 5.0 tests
+
+--echo #
+--echo # Bug#53942 valgrind warnings with timestamp() function and incomplete datetime values
+--echo #
+
+CREATE TABLE t1(f1 TIME);
+INSERT INTO t1 VALUES ('23:38:57');
+SELECT TIMESTAMP(f1,'1') FROM t1;
+DROP TABLE t1;
+
+--echo End of 5.1 tests

sql/field.cc

@@ -5312,7 +5312,6 @@ String *Field_time::val_str(String *val_buffer,
  
 bool Field_time::get_date(MYSQL_TIME *ltime, uint fuzzydate)
 {
-  long tmp;
   THD *thd= table ? table->in_use : current_thd;
   if (!(fuzzydate & TIME_FUZZY_DATE))
   {
@@ -5322,19 +5321,7 @@ bool Field_time::get_date(MYSQL_TIME *ltime, uint fuzzydate)
                         thd->row_count);
     return 1;
   }
-  tmp=(long) sint3korr(ptr);
-  ltime->neg=0;
-  if (tmp < 0)
-  {
-    ltime->neg= 1;
-    tmp=-tmp;
-  }
-  ltime->hour=tmp/10000;
-  tmp-=ltime->hour*10000;
-  ltime->minute=   tmp/100;
-  ltime->second= tmp % 100;
-  ltime->year= ltime->month= ltime->day= ltime->second_part= 0;
-  return 0;
+  return Field_time::get_time(ltime);
 }