159 Commits

Author	SHA1	Message	Date
Sergei Petrunia	c30119adc7	Testcase fix and code cleanup for window functions ... - Make queries that use multiple window functions not to leak memory - Code cleanup in sql_window.cc	2016-02-15 18:46:02 +03:00
Sergei Petrunia	d8a20d4db7	Post-merge fixes. win.test passes but further cleanup is needed.	2016-02-14 21:00:05 +03:00
Sergei Petrunia	a9ed132a0f	More testcases, fixed comments	2016-02-14 11:30:40 +03:00
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