Github user ravipesala commented on the issue:
https://github.com/apache/carbondata/pull/2665
@xuchuanyin In general if a datamap is created with a list of columns for
suppose c1 and c2 then we create an index datamap on c1 and c2 and treat that
as a composite index. So if user queries with filters on both the columns then
indexdatamap should combine both and make a single call of prune of that
datamap because user has created composite datamap. ---
