HIVE-29808: Iceberg: Add guardrails to compaction with schema evolution - #6690
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What changes were proposed in this pull request?
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?
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?
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?
Added more partition evolution cases to existing q-tests; Added new test class
TestIcebergTableUtilthat testsIcebergTableUtil.getPartitionSpec()against a real v1 Iceberg table built withHadoopTablesand 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.