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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
parent b432c7bc42
commit 9f4abde608
2 changed files with 42 additions and 54 deletions
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52
sql/item_cmpfunc.cc
View file

@ -2432,13 +2432,14 @@ void Item_func_between::print(String *str, enum_query_type query_type)
str->append(')');
}
void
Item_func_ifnull::fix_length_and_dec()
Item_func_case_abbreviation2::fix_length_and_dec(Item **args)
{
uint32 char_length;
agg_result_type(&cached_result_type, args, 2);
cached_field_type= agg_field_type(args, 2);
maybe_null=args[1]->maybe_null;
maybe_null=args[0]->maybe_null || args[1]->maybe_null;
decimals= MY_MAX(args[0]->decimals, args[1]->decimals);
unsigned_flag= args[0]->unsigned_flag && args[1]->unsigned_flag;
@ -2457,7 +2458,7 @@ Item_func_ifnull::fix_length_and_dec()
switch (cached_result_type) {
case STRING_RESULT:
if (count_string_result_length(cached_field_type, args, arg_count))
if (count_string_result_length(cached_field_type, args, 2))
return;
break;
case DECIMAL_RESULT:
@ -2475,7 +2476,8 @@ Item_func_ifnull::fix_length_and_dec()
}
uint Item_func_ifnull::decimal_precision() const
uint Item_func_case_abbreviation2::decimal_precision(Item **args) const
{
int arg0_int_part= args[0]->decimal_int_part();
int arg1_int_part= args[1]->decimal_int_part();
@ -2662,47 +2664,7 @@ Item_func_if::fix_length_and_dec()
maybe_null= true;
return;
}
agg_result_type(&cached_result_type, args + 1, 2);
cached_field_type= agg_field_type(args + 1, 2);
maybe_null= args[1]->maybe_null || args[2]->maybe_null;
decimals= MY_MAX(args[1]->decimals, args[2]->decimals);
unsigned_flag=args[1]->unsigned_flag && args[2]->unsigned_flag;
if (cached_result_type == STRING_RESULT)
{
count_string_result_length(cached_field_type, args + 1, 2);
return;
}
else
{
collation.set_numeric(); // Number
}
uint32 char_length;
if ((cached_result_type == DECIMAL_RESULT )
|| (cached_result_type == INT_RESULT))
{
int len1= args[1]->max_length - args[1]->decimals
- (args[1]->unsigned_flag ? 0 : 1);
int len2= args[2]->max_length - args[2]->decimals
- (args[2]->unsigned_flag ? 0 : 1);
char_length= MY_MAX(len1, len2) + decimals + (unsigned_flag ? 0 : 1);
}
else
char_length= MY_MAX(args[1]->max_char_length(), args[2]->max_char_length());
fix_char_length(char_length);
}
uint Item_func_if::decimal_precision() const
{
int arg1_prec= args[1]->decimal_int_part();
int arg2_prec= args[2]->decimal_int_part();
int precision=MY_MAX(arg1_prec,arg2_prec) + decimals;
return MY_MIN(precision, DECIMAL_MAX_PRECISION);
Item_func_case_abbreviation2::fix_length_and_dec(args + 1);
}

44
sql/item_cmpfunc.h
View file

@ -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);