Github user vkorukanti commented on the pull request:
https://github.com/apache/drill/pull/425#issuecomment-220101853
Tested with parquet metadata cache. Currently if you do a count(*) on
parquet table having metadata cache, we get that count from cache. For rowcount
in planning: if a stats table exists we get the count from stats table,
otherwise we get it from groupscan which in parquet case gets it from the
metadata cache if exists.
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