Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/13494
hi @lianhuiwang , thanks for working on it!
The overall idea LGTM, we should elimiante unnecessary file scan if only
partition columns are read. However, the current implementation looks not
corrected, we should also consider the number of rows. I also took a look at
the hive path, it only optimize partition columns used as aggregation keys,
where the number of duplicated rows doesn't matter.
I think we should either narrow down the scope of this PR and focus on
aggregation queries, or spent some more time for a more general design.
cc @yhuai @liancheng
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