feat(parquet): fuse level encoding passes and compact level representation#9653

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HippoBaro wants to merge 9 commits intoapache:mainfrom

HippoBaro:faster_sparse_columns_encoding

Commits on Apr 17, 2026

refactor(parquet): replace magic `8` literals with named constants
HippoBaro
committed
feat(parquet): fuse level encoding with counting and histogram updates
HippoBaro
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feat(parquet): batch RLE runs in level encoder via scan-ahead
HippoBaro
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feat(parquet): batch consecutive null/empty rows in `write_list`
HippoBaro
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feat(parquet): constant-time uniform encoding to `LevelEncoder`
HippoBaro
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feat(parquet): compact level representation with generic writer dispatch
HippoBaro
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feat(parquet): add all-null fast paths for level building
HippoBaro
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refactor(parquet): generalize value encoder inputs
HippoBaro
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refactor(parquet): generalize value encoder inputs
HippoBaro
committed