Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21144
@bersprockets I think we assume `Predicate.initialize` is called in not a
driver side but executor sides, so it's ok as it is (`SimpleTextSource.
buildReader` and `ExternalCatalogUtils.prunePartitionsByFilter`).
btw, as you know, the issue `UnsupportedOperationExceptions ` should be
fixed in SPARK-23580.
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