Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/9405#issuecomment-155980285
Hey @viirya, as mentioned in my inline comments, I have two major concerns
about this change:
1. It may introduce performance regression, i.e., in some cases small
Parquet dataset can't be broadcasted.
2. It relies on an assumption that completely depends on Parquet internal
implementation details
On the other hand, it's not clear that how much we gain from this change.
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