[Spark] Support create external table for clustered table #3251
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Which Delta project/connector is this regarding?
Description
Support creating a clustered table from an external location that already has a clustered table. We follow the same semantics as partitioned tables:
External location already has clustered/partitioned table:
DELTA_CREATE_TABLE_WITH_DIFFERENT_PARTITIONINGDELTA_CREATE_TABLE_WITH_DIFFERENT_CLUSTERINGDELTA_CREATE_TABLE_WITH_DIFFERENT_PARTITIONINGDELTA_CREATE_TABLE_WITH_DIFFERENT_CLUSTERINGExternal location already has non-clustered/non-partitioned table:
DELTA_CREATE_TABLE_WITH_DIFFERENT_PARTITIONINGDELTA_CREATE_TABLE_WITH_DIFFERENT_CLUSTERINGHow was this patch tested?
Added new unit tests to cover all scenarios above.
Does this PR introduce any user-facing changes?
No.