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| author | Sergei Petrunia <psergey@askmonty.org> | 2016-02-18 01:25:26 +0300 |
|---|---|---|
| committer | Sergei Petrunia <psergey@askmonty.org> | 2016-02-18 01:25:26 +0300 |
| commit | be15858245fc7c23ba14e26d4cead6f7312711dd (patch) | |
| tree | d51f86c5075b10fce36c171ac6210b388c733fc6 /sql/item_sum.h | |
| parent | 0c223a96c12689157894c09f91aa2a5500937afb (diff) | |
| download | mariadb-git-be15858245fc7c23ba14e26d4cead6f7312711dd.tar.gz | |
MDEV-9526: Compute Aggregate functions as window functions
- Add temporary code: clone_read_record() clones READ_RECORD structure,
as long as it is used for reading filesort() result that fits into
memory.
- Add frame bounds for ROWS-type frames. ROWS n PRECEDING|FOLLOWING,
ROWS UNBOUNDED PRECEDING|FOLLOWING, CURRENT ROW are supported.
- Add Item_sum_count::remove() which allows "streaming" computation
of COUNT() over a moving frame.
Diffstat (limited to 'sql/item_sum.h')
| -rw-r--r-- | sql/item_sum.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sql/item_sum.h b/sql/item_sum.h index e0e74efef28..c01735b00ff 100644 --- a/sql/item_sum.h +++ b/sql/item_sum.h @@ -545,6 +545,9 @@ public: virtual void clear()= 0; virtual bool add()= 0; virtual bool setup(THD *thd) { return false; } + + //psergey: for window functions: + virtual void remove() { DBUG_ASSERT(0); } virtual void cleanup(); bool check_vcol_func_processor(uchar *int_arg) @@ -784,6 +787,8 @@ class Item_sum_count :public Item_sum_int void clear(); bool add(); void cleanup(); + // psergey-added: + void remove(); public: Item_sum_count(THD *thd, Item *item_par): |