kangkaisen opened a new issue #1485: Add a Bitmap count distinct UDAF URL: https://github.com/apache/incubator-doris/issues/1485 Add a Bitmap count distinct UDAF base on RoaringBitmap. After simple test, **I find the bitmap count distinct is 2x~3x faster than default count distinct in some case**. The constraint for this bitmap UDAF: only support bool, tiny int, small int, , int.
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