feat: Replace mutable buffers with immutable Arrow vectors in NativeBatchReader#3382

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andygrove wants to merge 11 commits into

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andygrove:immutable-constant-column-reader

Commits on Feb 5, 2026

Export constant columns as 1-element scalar arrays for native expansion

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Add partition column scan benchmark to CometReadBenchmark

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Add CometPartitionColumnBenchmark for partition column scan performance

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Fix clippy warning: use iterator instead of index loop

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Fix partitionBy to pass column names as separate arguments

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Benchmark native_datafusion and native_iceberg_compat only

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