parquet: speed up ByteView dictionary decoder - #9745

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Dandandan:optimize-byte-view-dict-decoder

Commits on Apr 16, 2026

Speed up ByteView dictionary decoder with chunks_exact gather

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Branchless adjust_buffer_index and SIMD-friendly bounds check

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Commits on Apr 17, 2026

Remove unused ByteView import

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Use fold for max-key reduction in dict gather

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