Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21306
@rxin, I've updated this to use a new interface, `PartitionTransform`,
instead of `Expression`. This is used to pass well-known transformations when
creating tables, like `Filter` is used to pass a subset of `Expression` to data
sources for filtering (or deletes in #21308).
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