EmmyMiao87 commented on issue #165:
URL: https://github.com/apache/incubator-doris/issues/165#issuecomment-675964977


   Now, we already support agg type `Bitmap_union`. 
   If you have some business data related to tags, you can use the global 
dictionary function to map the tags to integers, and then use bitmap type to 
store them.
   If you want to calculate the union, you can use the `bitmap_union` function 
directly. 
   I don't know if this kind of meets your needs.


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