Make SYSDATE() behave as in Oracle: always the current datetime, not the

datetime of when the current statement began. This also makes SYSDATE()
not safe in replication. (Bug #12562)


mysql-test/r/func_time.result:
  Add new results
mysql-test/t/func_time.test:
  Add tests for new SYSDATE() behavior
sql/item_timefunc.cc:
  Add Item_func_sysdate_local implementation
sql/item_timefunc.h:
  Add Item_func_sysdate_local, so SYSDATE() can behave differently
  than NOW().
sql/lex.h:
  SYSDATE() is no longer an alias for NOW().
sql/sql_yacc.yy:
  Handle SYSDATE()

1 files changed, 27 insertions, 0 deletions

diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h
index d9300451fe7..4602088a5f5 100644
--- a/sql/item_timefunc.h
+++ b/sql/item_timefunc.h
@@ -446,6 +446,7 @@ public:
 
 class Item_func_now :public Item_date_func
 {
+protected:
   longlong value;
   char buff[20*2+32];	// +32 to make my_snprintf_{8bit|ucs2} happy
   uint buff_length;
@@ -485,6 +486,32 @@ public:
 };
 
 
+/*
+  This is like NOW(), but always uses the real current time, not the
+  query_start(). This matches the Oracle behavior.
+*/
+class Item_func_sysdate_local :public Item_func_now
+{
+public:
+  Item_func_sysdate_local() :Item_func_now() {}
+  Item_func_sysdate_local(Item *a) :Item_func_now(a) {}
+  bool const_item() const { return 0; }
+  const char *func_name() const { return "sysdate"; }
+  void store_now_in_TIME(TIME *now_time);
+  double val_real();
+  longlong val_int();
+  int save_in_field(Field *to, bool no_conversions);
+  String *val_str(String *str);
+  void fix_length_and_dec();
+  bool get_date(TIME *res, uint fuzzy_date);
+  void update_used_tables()
+  {
+    Item_func_now::update_used_tables();
+    used_tables_cache|= RAND_TABLE_BIT;
+  }
+};
+
+
 class Item_func_from_days :public Item_date
 {
 public: