[GitHub] [pinot] Jackie-Jiang commented on pull request #8411: accelerate counts over a single bitmap index

[GitBox <gi...@apache.org>]

Jackie-Jiang commented on pull request #8411:
URL: https://github.com/apache/pinot/pull/8411#issuecomment-1079449227


   This is great optimization. For count queries, we should avoid iterating the bitmaps to construct the `DocIdSetBlock`.
   The current implementation can only optimize the `BitmapBasedFilterOperator`, but ideally we want to optimize all count queries (e.g. count on sorted index can be significantly optimized to `endDocId - startDocId`). I'd suggest adding a new method `int getNumMatchingDocs()` to `BaseFilterOperator` to force all filter operators to support it, then this optimization can be applied to all queries with `count(*)` without group-by


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