Add partition function expressions for chained partitioning#18165

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xiangfu0:chain-partition-functions

Commits on May 9, 2026

Add partition function expressions for chained partitioning

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Fix expression-mode segment matching in SegmentPartitionMetadataManager

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Revert SegmentPartitionConfig.java drift to match upstream

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Drop partitionIdNormalizer; expression must produce values in [0, numPartitions)

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Drop getPartitionColumn from PartitionFunction SPI

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Simplify partition function plumbing

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