Github user ravipesala commented on the issue:
https://github.com/apache/carbondata/pull/3025
@qiuchenjian currently pre-aggregate datamap is not following the datamap
interfaces as it was implemented before datamap framework. That is why not all
datamap DDL works with pre-aggregate. It is better to keep the pre-aggregate
datamap untouched in this area until we decide whether to take MV datamap or
pre-aggregate datamap.---
