Github user ueshin commented on the pull request:
https://github.com/apache/spark/pull/2825#issuecomment-59461447
Hi @chenghao-intel, thank you for your comment.
Yes, that's right. I don't want to mix the logical plan & physical plan
optimization and I'll extend `SparkStrategies` if I need.
I want to add some `Expression`s for my projects and optimize logical plan
with them, but right now we can't replace `Optimizer` because it is an
`object`, so I want to add an extension point for `Optimizer`.
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