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Add a method to disable the automatic adding of values from cursors

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Currently cursors automatically add values to the sum functions they
manage. There are use cases when we just want to figure out the frame
boundaries, without actually adding/removing values from them.
This commit is contained in:
Vicențiu Ciorbaru
2016-09-07 22:32:48 +03:00
parent 3ba867be89
commit e174b13465
1 changed files with 22 additions and 0 deletions
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22
sql/sql_window.cc
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@ -748,6 +748,8 @@ private:
class Frame_cursor : public Sql_alloc
{
public:
Frame_cursor() : sum_functions(), perform_no_action(false) {}
virtual void init(READ_RECORD *info) {};
bool add_sum_func(Item_sum* item)
@ -783,9 +785,22 @@ public:
virtual ~Frame_cursor() {}
/*
Regular frame cursors add or remove values from the sum functions they
manage. By calling this method, they will only perform the required
movement within the table, but no adding/removing will happen.
*/
void set_no_action()
{
perform_no_action= true;
}
protected:
inline void add_value_to_items()
{
if (perform_no_action)
return;
List_iterator_fast<Item_sum> it(sum_functions);
Item_sum *item_sum;
while ((item_sum= it++))
@ -793,8 +808,12 @@ protected:
item_sum->add();
}
}
inline void remove_value_from_items()
{
if (perform_no_action)
return;
List_iterator_fast<Item_sum> it(sum_functions);
Item_sum *item_sum;
while ((item_sum= it++))
@ -805,6 +824,9 @@ protected:
/* Sum functions that this cursor handles. */
List<Item_sum> sum_functions;
private:
bool perform_no_action;
};
/*