jmk1011 opened a new issue #2762: select bitmap_count(to_bitmap(NULL)) is NULL, not 0 URL: https://github.com/apache/incubator-doris/issues/2762 **Describe the bug** select bitmap_count(to_bitmap(NULL)) is NULL, not 0 mysql> select bitmap_count(to_bitmap(NULL)); +-------------------------------+ | bitmap_count(to_bitmap(NULL)) | +-------------------------------+ | NULL | +-------------------------------+ https://github.com/apache/incubator-doris/blob/master/docs/documentation/cn/sql-reference/sql-functions/aggregate-functions/bitmap.md moreover, can't find the description of bitmap_count function in the documentation **Code Version** https://github.com/apache/incubator-doris/commit/a99a49a4444ccd2199356b7c1414adef7f58c32c
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