Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/12720#issuecomment-215317834
@davies we only move pulling out the predicates into the analyzer. The
actual planning (conversion into Semi Joins) still takes place in the
Optimizer. There are a few reasons for doing this:
- Rewriting IN/EXISTS into predicate subquery allows the analyzer to do
much better type checking and type conversions.
- Pulling out the references now comes for free.
- Not all plans are resolved without doing this. For instance you are
allowed to use outer aggregate expressions in a having.
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