106 Commits

Author	SHA1	Message	Date
Sergei Petrunia	64ab10ffff	Initial implementation of RANK() window function	2016-02-14 11:30:36 +03:00
Sergei Petrunia	30c9450af7	More comments	2016-02-14 11:30:14 +03:00
Sergei Petrunia	346c1a0ad0	Got sort-and-read single-pass window function computation to work	2016-02-14 11:29:53 +03:00
Sergei Petrunia	426cd232a7	Window functions: moving ahead ... Disable the code that attempts to group window functions together by their PARTITION BY / ORDER BY clauses, because 1. It doesn't work: when I issue a query with just one window function, and no indexes on the table, filesort is not invoked at all. 2. It is not possible to check that it works currently. Add my own code that does invoke filesort() for each window function. - Hopefully the sort criteria is right - Debugging shows that filesort operates on {sort_key, rowid} pairs (OK) - We can read the filesort rowid result in order.	2016-02-14 11:13:45 +03:00
Sergei Petrunia	c17f1df87b	Moved window function computation code from JOIN::exec_inner() into ... a separate function, JOIN::process_window_functions().	2016-02-14 11:13:00 +03:00
Igor Babaev	9d9c60fb12	Initial patch for the implementation of window functions (MDEV-6115): ... - All parsing problems look like resolved - Stub performing name resolution of window functions in simplest queries has been added.	2016-02-12 20:33:56 -08:00