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merge with 3.23.51

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BitKeeper/etc/ignore:
  auto-union
BitKeeper/etc/logging_ok:
  auto-union
BitKeeper/deleted/.del-mysql_fix_extensions.sh:
  Delete: scripts/mysql_fix_extensions.sh
Build-tools/Do-rpm:
  Auto merged
Makefile.am:
  Auto merged
client/mysqldump.c:
  Auto merged
client/mysqltest.c:
  Auto merged
extra/resolve_stack_dump.c:
  Auto merged
include/my_pthread.h:
  Auto merged
include/my_sys.h:
  Auto merged
include/mysqld_error.h:
  Auto merged
innobase/row/row0ins.c:
  Auto merged
innobase/row/row0mysql.c:
  Auto merged
innobase/row/row0sel.c:
  Auto merged
isam/pack_isam.c:
  Auto merged
libmysql/libmysql.c:
  Auto merged
mysql-test/r/func_if.result:
  Auto merged
mysql-test/t/join.test:
  Auto merged
mysys/array.c:
  Auto merged
mysys/charset.c:
  Auto merged
mysys/default.c:
  Auto merged
mysys/hash.c:
  Auto merged
mysys/my_thr_init.c:
  Auto merged
mysys/raid.cc:
  Auto merged
mysql-test/t/type_decimal.test:
  Auto merged
sql/hostname.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/item_cmpfunc.h:
  Auto merged
sql/item_timefunc.h:
  Auto merged
sql/log.cc:
  Auto merged
sql/mini_client.cc:
  Auto merged
sql/sql_parse.cc:
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sql/sql_select.cc:
  Auto merged
strings/Makefile.am:
  Auto merged
This commit is contained in:
unknown
2002-05-16 18:20:49 +03:00
parent 2618c6963c 74d29a0771
commit 4d094257db
769 changed files with 673 additions and 86016 deletions
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7
sql/item_cmpfunc.h
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@ -430,6 +430,7 @@ class Item_func_in :public Item_int_func
class Item_func_isnull :public Item_bool_func
{
longlong cached_value;
public:
Item_func_isnull(Item *a) :Item_bool_func(a) {}
longlong val_int();
@ -450,6 +451,12 @@ public:
args[0]->update_used_tables();
used_tables_cache=args[0]->used_tables();
}
if (!used_tables_cache)
{
/* Remember if the value is always NULL or never NULL */
args[0]->val();
cached_value= args[0]->null_value ? (longlong) 1 : (longlong) 0;
}
}
optimize_type select_optimize() const { return OPTIMIZE_NULL; }
};