Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/3778#issuecomment-68121946
@scwf Would you mind to list all the optimizations in the PR description
first? Some more concise examples coupled with each optimization can be really
helpful. Then we can help decoupling and polishing each optimization rule
individually. It's really hard to grasp your intention from the provided
complex query.
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