Github user xuchuanyin commented on the issue:
https://github.com/apache/carbondata/pull/2169
@ravipesala After I studied the code, I found that we must keep a map
between unique-blockletId to DMRow-pointer-index.
The relative blockletId in previous code was generated before datamap
pruning and has some relationship with DMRow-pointer-index. After pruning, some
blocks will be filtered and we can't get the real relative blocklet since some
blocks was filtered.---
