diff options
Diffstat (limited to 'sql/item.h')
| -rw-r--r-- | sql/item.h | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/sql/item.h b/sql/item.h index 0cfb0b01fd8..63d89113ec1 100644 --- a/sql/item.h +++ b/sql/item.h @@ -27,19 +27,7 @@ class Item_field; /* "Declared Type Collation" A combination of collation and its derivation. -*/ -enum Derivation -{ - DERIVATION_IGNORABLE= 5, - DERIVATION_COERCIBLE= 4, - DERIVATION_SYSCONST= 3, - DERIVATION_IMPLICIT= 2, - DERIVATION_NONE= 1, - DERIVATION_EXPLICIT= 0 -}; - -/* Flags for collation aggregation modes: MY_COLL_ALLOW_SUPERSET_CONV - allow conversion to a superset MY_COLL_ALLOW_COERCIBLE_CONV - allow conversion of a coercible value @@ -617,9 +605,14 @@ public: my_decimal *val_decimal_from_real(my_decimal *decimal_value); my_decimal *val_decimal_from_int(my_decimal *decimal_value); my_decimal *val_decimal_from_string(my_decimal *decimal_value); + my_decimal *val_decimal_from_date(my_decimal *decimal_value); + my_decimal *val_decimal_from_time(my_decimal *decimal_value); longlong val_int_from_decimal(); double val_real_from_decimal(); + int save_time_in_field(Field *field); + int save_date_in_field(Field *field); + virtual Field *get_tmp_table_field() { return 0; } /* This is also used to create fields in CREATE ... SELECT: */ virtual Field *tmp_table_field(TABLE *t_arg) { return 0; } @@ -1959,6 +1952,16 @@ public: class Item_in_subselect; + +/* + An object of this class: + - Converts val_XXX() calls to ref->val_XXX_result() calls, like Item_ref. + - Sets owner->was_null=TRUE if it has returned a NULL value from any + val_XXX() function. This allows to inject an Item_ref_null_helper + object into subquery and then check if the subquery has produced a row + with NULL value. +*/ + class Item_ref_null_helper: public Item_ref { protected: |