Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/2825#issuecomment-59457217
Sorry, I mean probably we don't want to mix the logical plan & physical
plan optimization, the logical plan optimization should be generic, if we want
to do some customized optimization for specific engine (e.g. MapReduce /
Spark), we'd better to do that in physical plan, e.g. `SparkStrategies.scala`
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