Add blog: Sort Pushdown in DataFusion: Skip Sorts, Skip Decode, Skip I/O#186

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zhuqi-lucas:blog-sort-pushdown

Commits on Jun 29, 2026

Add blog: Sort Pushdown in DataFusion: Skip Sorts, Skip I/O
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Push draft date to 2026-05-25
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Add Phase 3 section covering #21956 runtime reorder pipeline
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Add empirical note: why we keep an out-of-tree RG-level Exact reverse
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Correct internal RG-Exact description and trim arrow-rs #9937 duplication
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Mark #21956 as landed (merged via merge queue)
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Reframe blog from Phase N → capability-based sections
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Clarify two-layer composability: same key (min), not 'nest by construction'
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Strip inline PR refs from narrative; collect all links in References
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Restructure: split into merged-features / bottlenecks / roadmap
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Tighten verbose paragraphs; drop unrelated limit-pruning blog reference
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Fold reverse as case of Inexact runtime reorder; make two-trigger asymmetry explicit
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Drop EnsureRequirements + OFFSET pushdown — both unrelated to sort pushdown
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Roadmap RG-level early termination: split into non-overlap vs overlap (k-way merge)
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Commits on Jul 4, 2026

Rewrite blog around #22450: three-layer pruning + topk_tpch headline
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