According to these declarations:
class Item_basic_constant :public Item
|
{
|
table_map used_table_map;
|
...
|
};
|
...
|
class Item_cache: public Item_basic_constant
|
{
|
protected:
|
Item *example;
|
table_map used_table_map;
|
...
|
}
|
Item_cache has two used_tables_cache, one of which is declared in Item_cache itself, and another one is derived from Item_basic_constant.
It's very likely that the second declaration is not really necessary.
There are no comments yet on this issue.
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