jacktengg opened a new pull request, #17849:
URL: https://github.com/apache/doris/pull/17849
# Proposed changes
Issue Number: close #xxx
## Problem summary
bitmap count functions result ss null when there are null values, which is
not right:
```
mysql [(none)]>select bitmap_and_count(to_bitmap(1), null);
+----------------------------------------+
| bitmap_and_count(to_bitmap('1'), NULL) |
+----------------------------------------+
| NULL |
+----------------------------------------+
1 row in set (0.04 sec)
mysql [(none)]>select bitmap_xor_count(to_bitmap(1), null);
+----------------------------------------+
| bitmap_xor_count(to_bitmap('1'), NULL) |
+----------------------------------------+
| NULL |
+----------------------------------------+
1 row in set (0.03 sec)
mysql [(none)]>select bitmap_and_not_count(to_bitmap(1), null);
+--------------------------------------------+
| bitmap_and_not_count(to_bitmap('1'), NULL) |
+--------------------------------------------+
| NULL |
+--------------------------------------------+
```
Theare should be consistent with `bitmap_count(bitmap_xxx())`:
```
mysql [(none)]>select bitmap_count(bitmap_and(to_bitmap(1), null));
+------------------------------------------------+
| bitmap_count(bitmap_and(to_bitmap('1'), NULL)) |
+------------------------------------------------+
| 0 |
+------------------------------------------------+
mysql [(none)]>select bitmap_count(bitmap_xor(to_bitmap(1), null));
+------------------------------------------------+
| bitmap_count(bitmap_xor(to_bitmap('1'), NULL)) |
+------------------------------------------------+
| 0 |
+------------------------------------------------+
mysql [(none)]>select bitmap_count(bitmap_and_not(to_bitmap(1), null));
+----------------------------------------------------+
| bitmap_count(bitmap_and_not(to_bitmap('1'), NULL)) |
+----------------------------------------------------+
| 0 |
+----------------------------------------------------+
```
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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