diff options
Diffstat (limited to 'sql/item_func.h')
| -rw-r--r-- | sql/item_func.h | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/sql/item_func.h b/sql/item_func.h index d84abdb6e56..08906ae826e 100644 --- a/sql/item_func.h +++ b/sql/item_func.h @@ -55,7 +55,7 @@ public: NOW_FUNC, TRIG_COND_FUNC, SUSERVAR_FUNC, GUSERVAR_FUNC, COLLATE_FUNC, EXTRACT_FUNC, CHAR_TYPECAST_FUNC, FUNC_SP, UDF_FUNC, - NEG_FUNC }; + NEG_FUNC, GSYSVAR_FUNC }; enum optimize_type { OPTIMIZE_NONE,OPTIMIZE_KEY,OPTIMIZE_OP, OPTIMIZE_NULL, OPTIMIZE_EQUAL }; enum Type type() const { return FUNC_ITEM; } @@ -1426,24 +1426,36 @@ public: /* A system variable */ +#define GET_SYS_VAR_CACHE_LONG 1 +#define GET_SYS_VAR_CACHE_DOUBLE 2 +#define GET_SYS_VAR_CACHE_STRING 4 + class Item_func_get_system_var :public Item_func { sys_var *var; - enum_var_type var_type; + enum_var_type var_type, orig_var_type; LEX_STRING component; + longlong cached_llval; + double cached_dval; + String cached_strval; + my_bool cached_null_value; + query_id_t used_query_id; + uchar cache_present; + public: Item_func_get_system_var(sys_var *var_arg, enum_var_type var_type_arg, LEX_STRING *component_arg, const char *name_arg, size_t name_len_arg); - bool fix_fields(THD *thd, Item **ref); - /* - Stubs for pure virtual methods. Should never be called: this - item is always substituted with a constant in fix_fields(). - */ - double val_real() { DBUG_ASSERT(0); return 0.0; } - longlong val_int() { DBUG_ASSERT(0); return 0; } - String* val_str(String*) { DBUG_ASSERT(0); return 0; } - void fix_length_and_dec() { DBUG_ASSERT(0); } + enum Functype functype() const { return GSYSVAR_FUNC; } + void fix_length_and_dec(); + void print(String *str, enum_query_type query_type); + bool const_item() const { return true; } + table_map used_tables() const { return 0; } + enum Item_result result_type() const; + enum_field_types field_type() const; + double val_real(); + longlong val_int(); + String* val_str(String*); /* TODO: fix to support views */ const char *func_name() const { return "get_system_var"; } /** @@ -1455,6 +1467,9 @@ public: @return true if the variable is written to the binlog, false otherwise. */ bool is_written_to_binlog(); + bool eq(const Item *item, bool binary_cmp) const; + + void cleanup(); }; |