feat(parquet): row-group morselization for sibling FileStream stealing#21766

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Dandandan:row-group-morselization

Commits on Apr 21, 2026

feat(parquet): row-group morselization for sibling FileStream stealing

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refactor(parquet): donor finalizes pruning; stealers go to BuildStream directly

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cleanup: trim dead code and redundant comments from row-group split path

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perf(parquet): build row-filter candidates once per file, share to stealers

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perf(parquet): cache projection read plan + output schema once per scan

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chore: drop narrating comment above read_plan cache build

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Commits on Apr 22, 2026