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unknown 2004-09-25 16:05:50 +03:00
parent 4038218b18
commit 40c12fa8c6
1 changed files with 13 additions and 1 deletions
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14
sql/item.h
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@ -218,7 +218,8 @@ public:
a constant expression
*/
virtual bool basic_const_item() const { return 0; }
virtual Item *new_item() { return 0; } /* Only for const items */
/* cloning of constant items (0 if it is not const) */
virtual Item *new_item() { return 0; }
virtual cond_result eq_cmp_result() const { return COND_OK; }
inline uint float_length(uint decimals_par) const
{ return decimals != NOT_FIXED_DEC ? (DBL_DIG+2+decimals_par) : DBL_DIG+8;}
@ -242,11 +243,22 @@ public:
virtual bool get_date_result(TIME *ltime,uint fuzzydate)
{ return get_date(ltime,fuzzydate); }
virtual bool is_null() { return 0; }
/*
it is "top level" item of WHERE clause and we do not need correct NULL
handling
*/
virtual void top_level_item() {}
/*
set field of temporary table for Item which can be switched on temporary
table during query processing (groupping and so on)
*/
virtual void set_result_field(Field *field) {}
virtual bool is_result_field() { return 0; }
virtual bool is_bool_func() { return 0; }
virtual void save_in_result_field(bool no_conversions) {}
/*
set value of aggegate function in case of no rows for groupping were found
*/
virtual void no_rows_in_result() {}
virtual Item *copy_or_same(THD *thd) { return this; }
virtual Item *copy_andor_structure(THD *thd) { return this; }