3 Commits

Author	SHA1	Message	Date
Sergey Zefirov	8632c85ecf	feat(primproc,aggregegation)!: Changes for ROLLUP with single-phase aggregation (#3025) ... The fix is simple: enable subtotals in single-phase aggregation and disable parallel processing when there are subtotals and aggregation is single-phase.	2023-11-28 17:33:02 +03:00
Sergey Zefirov	69b8e1c779	feat(extent-elimination)!: re-enable extent-elimination for dictionary columns scanning ... This is "productization" of an old code that would enable extent elimination for dictionary columns. This concrete patch enables it, fixes perfomance degradation (main problem with old code) and also fixes incorrect behavior of cpimport.	2023-11-17 17:14:35 +03:00
Serguey Zefirov	53b9a2a0f9	MCOL-4580 extent elimination for dictionary-based text/varchar types ... The idea is relatively simple - encode prefixes of collated strings as integers and use them to compute extents' ranges. Then we can eliminate extents with strings. The actual patch does have all the code there but miss one important step: we do not keep collation index, we keep charset index. Because of this, some of the tests in the bugfix suite fail and thus main functionality is turned off. The reason of this patch to be put into PR at all is that it contains changes that made CHAR/VARCHAR columns unsigned. This change is needed in vectorization work.	2022-03-02 23:53:39 +03:00