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MDEV-12559 Split Item::temporal_precision() into virtual methods in Type_handler

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- Adding a new virtual method Type_handler::Item_time_precision()
- Adding a new virtual method Type_handler::Item_datetime_precision()
- Removing Item::temporal_precision() and adding Item::time_precision()
  and Item::datetime_precision() instead.
- Moving Item_func_convert_tz::fix_length_and_dec() from item_timefunc.cc
  to item_timefunc.h. It's only two lines, and we're changing it anyway.
- Removing Item_temporal_typecast::fix_length_and_dec_generic(),
  moving this code to
  Type_handler::Item_{date|time|datetime}_typecast_fix_length_and_dec().
  This allows to get rid of one more field_type() call.
  Also, in the old reduction, Item_date_typecast::fix_length_and_dec()
  unnecessarily called args[0]->temporal_precision(). The new reduction
  does not call args[0]->datetime_precision(), as DATE does not
  have fractional digits.
This commit is contained in:
Alexander Barkov
2017-04-22 21:59:00 +04:00
parent b781408601
commit ba670edfa3
6 changed files with 88 additions and 62 deletions
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11
sql/sql_type.h
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@@ -389,6 +389,8 @@ public:
{
return true;
}
virtual uint Item_time_precision(Item *item) const;
virtual uint Item_datetime_precision(Item *item) const;
/**
Makes a temporary table Field to handle numeric aggregate functions,
e.g. SUM(DISTINCT expr), AVG(DISTINCT expr), etc.
@@ -1040,6 +1042,7 @@ public:
class Type_handler_string_result: public Type_handler
{
uint Item_temporal_precision(Item *item, bool is_time) const;
public:
Item_result result_type() const { return STRING_RESULT; }
Item_result cmp_type() const { return STRING_RESULT; }
@@ -1055,6 +1058,14 @@ public:
const Type_std_attributes *item,
SORT_FIELD_ATTR *attr) const;
uint32 max_display_length(const Item *item) const;
uint Item_time_precision(Item *item) const
{
return Item_temporal_precision(item, true);
}
uint Item_datetime_precision(Item *item) const
{
return Item_temporal_precision(item, false);
}
int Item_save_in_field(Item *item, Field *field, bool no_conversions) const;
String *print_item_value(THD *thd, Item *item, String *str) const
{