gaodayue opened a new issue #2771: Support 64-bits integers as elements for BITMAP type URL: https://github.com/apache/incubator-doris/issues/2771 **Is your feature request related to a problem? Please describe.** BITMAP data type in doris is very often used to calculate the DAU metrics for internet products. The current implementation only supports 32-bits unsigned ints as its elements, which limits the data type that can be ingested into bitmap columns. In particular, many company uses BIGINT for `user_id`, hence we want to support 64-bits integers directly for BITMAP type. Similar [feature request](https://github.com/RoaringBitmap/RoaringBitmap/issues/109) has been submitted to the RoaringBitmap community, which leads to 64-bits support in https://github.com/RoaringBitmap/CRoaring/pull/75 Since we're leveraging Roaring as the underlying data structures, we can incorporate the 64-bits support as well.
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