sileiH opened a new issue #5272:
URL: https://github.com/apache/incubator-doris/issues/5272
**Describe the bug**
1）Bitmap does not support UNIONS
2）The bitmap_intersect function always returns a value of 0
**To Reproduce**
Steps to reproduce the behavior:
1）
```
SELECT
bitmap_from_string ('1,2,3,4,5') AS a
UNION
SELECT
bitmap_from_string ('1,2,3,4,5,6') AS a
```
2）
```
select bitmap_count(bitmap_intersect(fid_bitmap)) from
feature_bitmap_tmp where feature_value = '1' or feature_value = '2'
```
use Doris-0.13.15 and Doris-0.12.13
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