feat: Add support for Arrow LargeListArray in Parquet data projection #510
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Add support for projecting Arrow LargeListArray (64-bit offsets) in addition to the existing ListArray (32-bit offsets) support. This enables handling of lists with more than 2^31-1 total child elements. Changes: - Add templated ProjectListArrayImpl<> to handle both list types - Add ProjectLargeListArray wrapper function - Update ProjectNestedArray to dispatch to appropriate handler - Add test cases for LargeListArray projection Test results: - LargeListOfIntegers: PASSED (0 ms) - LargeListOfStructs: PASSED (0 ms) Closes apache#502
wgtmac
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Jan 15, 2026
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wgtmac
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LGTM. Thanks @callmepandey! This is just the data conversion. Do you want to create a separate PR to enable it in the parquet reader implementation?
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Summary
Add support for projecting Arrow
LargeListArray(64-bit offsets) in addition to the existingListArray(32-bit offsets) support. This enables handling of lists with more than 2^31-1 total child elements.Changes
ProjectListArrayImpl<>function for code reuse between list typesProjectLargeListArraywrapper function for 64-bit offset listsProjectNestedArrayto dispatch to appropriate handler based on Arrow typeLargeListArrayprojectionTest Results
All 59 tests pass.
Test Plan
LargeListOfIntegerstest - verifies projection ofLargeListArray<int32>LargeListOfStructstest - verifies projection ofLargeListArraywith nested struct elementsCloses #502