diff options
Diffstat (limited to 'sql/item_timefunc.h')
| -rw-r--r-- | sql/item_timefunc.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/sql/item_timefunc.h b/sql/item_timefunc.h index a7ff2924786..2254fc830c9 100644 --- a/sql/item_timefunc.h +++ b/sql/item_timefunc.h @@ -531,9 +531,22 @@ class Item_func_from_unixtime :public Item_date_func */ class Time_zone; +/* + This class represents CONVERT_TZ() function. + The important fact about this function that it is handled in special way. + When such function is met in expression time_zone system tables are added + to global list of tables to open, so later those already opened and locked + tables can be used during this function calculation for loading time zone + descriptions. +*/ class Item_func_convert_tz :public Item_date_func { - THD *thd; + /* Cached pointer to list of pre-opened time zone tables. */ + TABLE_LIST *tz_tables; + /* + If time zone parameters are constants we are caching objects that + represent them. + */ Time_zone *from_tz, *to_tz; public: Item_func_convert_tz(Item *a, Item *b, Item *c): @@ -542,6 +555,7 @@ class Item_func_convert_tz :public Item_date_func double val() { return (double) val_int(); } String *val_str(String *str); const char *func_name() const { return "convert_tz"; } + bool fix_fields(THD *, struct st_table_list *, Item **); void fix_length_and_dec(); bool get_date(TIME *res, uint fuzzy_date); }; |