bugfixes:

  microsecond(TIME)
  alter table datetime<->datetime(6)
  max(TIME), mix(TIME) 

mysql-test/t/func_if.test:
  fix the test case of avoid overflow
sql/field.cc:
  don't use make_date() and make_time()
sql/field.h:
  correct eq_def() for temporal fields
sql/item.cc:
  move datetime caching from Item_cache_int
  to Item_cache_temporal
sql/item.h:
  move datetime caching from Item_cache_int
  to Item_cache_temporal
sql/item_func.cc:
  use existing helper methods, don't duplicate
sql/item_sum.cc:
  argument cache must use argument's cmp_type, not result_type.
sql/item_timefunc.cc:
  use existing methods, don't tuplicate.
  remove unused function.
  fix micorseconds() to support TIME argument
sql/mysql_priv.h:
  dead code
sql/time.cc:
  dead code

1 files changed, 14 insertions, 2 deletions

diff --git a/sql/field.cc b/sql/field.cc
index 471072d2595..884c424aaf7 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -5289,7 +5289,13 @@ String *Field_time::val_str(String *val_buffer,
   ltime.minute= (uint) (tmp/100 % 100);
   ltime.second= (uint) (tmp % 100);
   ltime.second_part= 0;
-  make_time((DATE_TIME_FORMAT*) 0, &ltime, val_buffer);
+
+  val_buffer->alloc(MAX_DATE_STRING_REP_LENGTH);
+  uint length= (uint) my_time_to_str(&ltime,
+                                     const_cast<char*>(val_buffer->ptr()), 0);
+  val_buffer->length(length);
+  val_buffer->set_charset(&my_charset_bin);
+
   return val_buffer;
 }
 
@@ -5664,7 +5670,13 @@ String *Field_date::val_str(String *val_buffer,
   ltime.year= (int) ((uint32) tmp/10000L % 10000);
   ltime.month= (int) ((uint32) tmp/100 % 100);
   ltime.day= (int) ((uint32) tmp % 100);
-  make_date((DATE_TIME_FORMAT *) 0, &ltime, val_buffer);
+
+  val_buffer->alloc(MAX_DATE_STRING_REP_LENGTH);
+  uint length= (uint) my_date_to_str(&ltime,
+                                     const_cast<char*>(val_buffer->ptr()));
+  val_buffer->length(length);
+  val_buffer->set_charset(&my_charset_bin);
+
   return val_buffer;
 }