feat: [iceberg] Test Parquet metadata caching in iceberg-rust#3365

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mbutrovich wants to merge 25 commits intoapache:mainfrom

mbutrovich:test_iceberg_metadata_caching

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.
mbutrovich
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Commits on Feb 2, 2026