Commit Graph

2 Commits

Author SHA1 Message Date
Nikita Taranov
100c055510
Prefetching in aggregation ()
* impl

* stash

* clean up

* do not apply when HT is small

* make branch static

* also in merge

* do not hardcode look ahead value

* fix

* apply to methods with cheap key calculation

* more tests

* silence tidy

* fix build

* support HashMethodKeysFixed

* apply during merge only for cheap

* stash

* fixes

* rename method

* add feature flag

* cache prefetch threshold value

* fix

* fix

* Update HashMap.h

* fix typo

* 256KB as default l2 size

Co-authored-by: Alexey Milovidov <milovidov@clickhouse.com>
2022-09-21 18:59:07 +02:00
Alexey Milovidov
5bdc570046 Improve performance of GROUP BY multiple fixed size keys 2021-02-14 01:56:04 +03:00