kangpinghuang commented on pull request #3601:
URL: https://github.com/apache/incubator-doris/pull/3601#issuecomment-631196531


   > > Large bitmap will need use StringVal to allocate large memory, which is 
large than MAX_INT.
   > > The overflow will cause serialization failure of bitmap.
   > 
   > @kangpinghuang Hi. you mean the bitmap size is larger than 2G? are you 
sure which is reasonable?
   
   yes, There is a user who use the bitmap to do the count distinct. In his 
situation, the dimension is about 30billion, the bitmap I see is about 3G.


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