Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/12385#issuecomment-210226644
Partition-related operations are complex.
- Drop Partitions: It allows partial matches, however, we need to ensure
the orders are the same. That means, the specified to-be-dropped spec should be
consistent with the defined partitioning spec.
- Add Partitions: We need to ensure the newly added columns are from the
existing schema. We also need to ensure it does not miss the leading
partitioning columns.
- Rename Partitions: The old spec should be part of the existing
partitioning spec. The new spec should be part of table schema.
... Still trying to explore all the cases in Apache Hive. @yhuai
@andrewor14
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