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, 2 insertions, 1 deletions

diff --git a/mysql-test/t/func_if.test b/mysql-test/t/func_if.test
index 8142f57c0de..bbe9958685a 100644
--- a/mysql-test/t/func_if.test
+++ b/mysql-test/t/func_if.test
@@ -161,8 +161,9 @@ DROP TABLE t1;
 #
 
 CREATE TABLE t1 (c LONGTEXT);
-INSERT INTO t1 VALUES(1), (2), (3), (4), ('12345678901234567890');
+INSERT INTO t1 VALUES(1), (2), (3), (4), ('1234567890123456789');
 
+SELECT IF(1, CAST(c AS UNSIGNED), 0) FROM t1;
 SELECT * FROM (SELECT MAX(IF(1, CAST(c AS UNSIGNED), 0)) FROM t1) AS te;
 SELECT * FROM (SELECT MAX(IFNULL(CAST(c AS UNSIGNED), 0)) FROM t1) AS te;