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Sharing similar code between Item_func_ifnull and Item_func_if

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This commit is contained in:
Alexander Barkov 2014-11-19 21:34:51 +04:00
commit 9f4abde608
2 changed files with 42 additions and 54 deletions
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44
sql/item_cmpfunc.h
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@ -756,29 +756,52 @@ public:
};
class Item_func_ifnull :public Item_func_coalesce
/*
Case abbreviations that aggregate its result field type by two arguments:
IFNULL(arg1, arg2)
IF(switch, arg1, arg2)
*/
class Item_func_case_abbreviation2 :public Item_func_hybrid_field_type
{
protected:
bool field_type_defined;
public:
Item_func_ifnull(Item *a, Item *b) :Item_func_coalesce(a,b) {}
Item_func_case_abbreviation2(Item *a, Item *b)
:Item_func_hybrid_field_type(a, b) { }
Item_func_case_abbreviation2(Item *a, Item *b, Item *c)
:Item_func_hybrid_field_type(a, b, c) { }
void fix_length_and_dec(Item **args);
uint decimal_precision(Item **args) const;
};
class Item_func_ifnull :public Item_func_case_abbreviation2
{
public:
Item_func_ifnull(Item *a, Item *b) :Item_func_case_abbreviation2(a,b) {}
double real_op();
longlong int_op();
String *str_op(String *str);
my_decimal *decimal_op(my_decimal *);
bool date_op(MYSQL_TIME *ltime,uint fuzzydate);
void fix_length_and_dec();
void fix_length_and_dec()
{
Item_func_case_abbreviation2::fix_length_and_dec(args);
maybe_null= args[1]->maybe_null;
}
const char *func_name() const { return "ifnull"; }
Field *tmp_table_field(TABLE *table);
uint decimal_precision() const;
table_map not_null_tables() const { return 0; }
uint decimal_precision() const
{
return Item_func_case_abbreviation2::decimal_precision(args);
}
};
class Item_func_if :public Item_func_hybrid_field_type
class Item_func_if :public Item_func_case_abbreviation2
{
public:
Item_func_if(Item *a,Item *b,Item *c)
:Item_func_hybrid_field_type(a,b,c)
:Item_func_case_abbreviation2(a, b, c)
{}
bool date_op(MYSQL_TIME *ltime, uint fuzzydate);
longlong int_op();
@ -787,7 +810,10 @@ public:
String *str_op(String *);
bool fix_fields(THD *, Item **);
void fix_length_and_dec();
uint decimal_precision() const;
uint decimal_precision() const
{
return Item_func_case_abbreviation2::decimal_precision(args + 1);
}
const char *func_name() const { return "if"; }
bool eval_not_null_tables(uchar *opt_arg);
void fix_after_pullout(st_select_lex *new_parent, Item **ref);