Wang857857 opened a new issue, #13521:
URL: https://github.com/apache/doris/issues/13521

   SELECT BITMAP_TO_STRING(BITMAP_INTERSECT(user_id)) from ((SELECT 
TO_BITMAP(1) user_id) union all (SELECT NULL user_id)) t1
   
   输出:1
   
   SELECT BITMAP_TO_STRING(BITMAP_INTERSECT(user_id)) from ((SELECT 
TO_BITMAP(1) user_id) union all (SELECT BITMAP_EMPTY() user_id)) t1
   
   输出:''


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