Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/9399#issuecomment-153202825
Ok, actually I was planning to optimize the expression with partition key,
which will introduce the `ConstantFolding`, as the partition key will be a
constant value in runtime.
I know, for DataSource developer, the `HadoopFsRelation` will only return
the single partition data as the RDD, that's what my question, how to define
the `unhandledFilter`, will the filter with partition key always be part of the
`unhandledFilter`?
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