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GH-35692: [C++][Parquet] Support to read fixed size list array with nulls#50271

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GH-35692: [C++][Parquet] Support to read fixed size list array with nulls#50271
HuaHuaY wants to merge 1 commit into
apache:mainfrom
HuaHuaY:nested_fixed_size_list_reader

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@HuaHuaY

@HuaHuaY HuaHuaY commented Jun 27, 2026

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Rationale for this change

Support to read fixed size list array with nulls.

What changes are included in this PR?

Modified FixedSizeListReader to add null slots to FixedSizeList.

Are these changes tested?

Yes.

Are there any user-facing changes?

User can read fixed size list array with nulls now.

This PR also fixes GH-35697.

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[C++][Parquet] NotImplemented: Lists with non-zero length null components are not supported

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