Chang chen
Chang chen
**More infomation**: this degradation is due to the following 3 PRs: 1. https://github.com/ClickHouse/ClickHouse/pull/27136 2. https://github.com/ClickHouse/ClickHouse/pull/27743 3. https://github.com/ClickHouse/ClickHouse/pull/27872
Any progress? it looks, we can first build below structure from a list of 64 bitmaps : ```java NavigableMap Bitmaps; ``` And then using `FastAggregation` to aggregate each groups. and...
@lemire I just don't know whether I am on the correct way or not, If this is ok, I will create a PR
OK, I create a PR for review the idea. see https://github.com/RoaringBitmap/RoaringBitmap/pull/416
@beliefer thanks for bring this up! cc @cloud-fan would you pelease review this PR.
@rui-mo thanks There are 3 cases for not in or not exists where sets: 1. empty 2. sets which have null vlues 3. sets which have none-null values. When not...
hi @tedyu Is the new API you used supported in 1.0.x?
@copperybean it's cool feature Do you have plans to support page index? In this case，we need to skip reading some rows.
> @alexey-milovidov Based on #45868, lazy projection has been implemented to improve performance. The current code implementation is quite rudimentary, but it still has some effectiveness for som queries. For...
It looks like `Columnlazy` could be more general, for example: 1. In case of `a join b join c`, we could materialize column after all joins are done, which could...