difin opened a new pull request, #6690:
URL: https://github.com/apache/hive/pull/6690
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### What changes were proposed in this pull request?
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Added guardrails for Iceberg partition-scoped compaction on tables that have
undergone partition spec evolution, where the same partition path can match
more than one historical spec. This scenario is possible with partition schema
evolution with Iceberg v1 tables. Also, added more tests for partition schema
evolution that cover the following cases: unpartitioned to partitioned , spec
change, back to unpartitioned.
### Why are the changes needed?
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Iceberg compaction matches partitions by path and with Iceberg v1 tables
that undergone partition schema evolution this can cause issues.
### Does this PR introduce _any_ user-facing change?
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Yes, Iceberg compaction may be refused for Iceberg v1 tables that undergone
partition schema evolution in case more than one partition matches the same
path.
### How was this patch tested?
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Added more partition evolution cases to existing q-tests; Added new test
class `TestIcebergTableUtil` that tests `IcebergTableUtil.getPartitionSpec()`
against a real v1 Iceberg table built with `HadoopTables` and evolved via the
Iceberg API: ambiguous resolution after repeated spec changes (identity →
unpartitioned → identity), a unique match after a single spec change, and
failure when no spec matches the partition path.
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