Details
-
Task
-
Status: Closed (View Workflow)
-
Major
-
Resolution: Fixed
Description
As a part of preparatory work for MDEV-4912, we'll add a new virtual method in Type_handler:
virtual Item_cache *Item_get_cache(THD *thd, const Item *item) const; |
and split this code into implementations of the new virtual method:
Item_cache* Item_cache::get_cache(THD *thd, const Item *item, |
const Item_result type) |
{
|
MEM_ROOT *mem_root= thd->mem_root;
|
switch (type) { |
case INT_RESULT: |
return new (mem_root) Item_cache_int(thd, item->field_type()); |
case REAL_RESULT: |
return new (mem_root) Item_cache_real(thd); |
case DECIMAL_RESULT: |
return new (mem_root) Item_cache_decimal(thd); |
case STRING_RESULT: |
return new (mem_root) Item_cache_str(thd, item); |
case ROW_RESULT: |
return new (mem_root) Item_cache_row(thd); |
case TIME_RESULT: |
return new (mem_root) Item_cache_temporal(thd, item->field_type()); |
}
|
return 0; // Impossible |
}
|
This will allow data type plugins to create their own versions of Item_cache, to optimize comparison with constants.
Attachments
Issue Links
- blocks
-
MDEV-4912 Data type plugin API version 1
-
- Closed
-