Github user davies commented on the pull request:
https://github.com/apache/spark/pull/12306#issuecomment-210648932
@hvanhovell Since you separate resolution and rewrite, it's easy to move
the rewrite rule into optimizer, right (those checking could be moved to
CheckAnalysis)? By deferring the rewrite, we could push down some predicates
that have subquery. Also The optimizer may add more subqueries (for dynamic
partition pruning), we also need this rewrite in optimizer.
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