Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/15568
@mallman , item 4 is a potential problem in the future. The current
workflow is, we get the `MetastoreRelation` via
`HiveMetastoreCatalog.lookupRelation`, which always lower case the database and
table name. Then we construct `TableFileCatalog` and call
`ExternalCatalog.listPartitionsByFilter` with the database and table name. So
we won't have case senstivity problem here.
However, we may have a workflow which call `listPartitionsByFilter`
directly with database and table name given by users. e.g. #15302. Then we need
to care about case sensitivity.
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