Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/14839
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GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/14839
[SPARK-17270][SQL] Move object optimization rules into its own file
## What changes were proposed in this pull request?
As part of breaking Optimizer.scala apart, this patch moves various Dataset
