feat: CometExecRDD supports per-partition plan data, reduce Iceberg native scan serialization, add DPP [iceberg] #3349

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mbutrovich wants to merge 35 commits intoapache:mainfrom

mbutrovich:iceberg-split-serialization-dpp

Commits on Jan 30, 2026

Continue #3295, experimental DPP support.
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Remove unnecessary steps in convert(), hoist reflection calls out of loop.
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scalastyle
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Fix scenario with multiple DPP expressions (i.e., join on two partitioned columns) and run a representative test.
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Docs.
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Throw an exception on reflection error in setInSubqueryResult, stronger assertion in DPP test.
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Comments cleanup. Throw exception if column not found in subquery.
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Avoid capturing perPartitionByLocation in closure when:
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Remove IcebergFilePartition from proto and clean up native code now that every partition doesn't come over.
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Commits on Feb 2, 2026

Address PR feedback.
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Commits on Feb 4, 2026

Merge branch 'main' into iceberg-split-serialization-dpp
mbutrovich
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Commits on Feb 5, 2026

Commits on Feb 7, 2026