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MR-925: re-align §-references in writeups after full re-read of MR-737

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On full re-read of MR-737, the section numbering used in several of the
original MR-925 cross-references no longer lines up:

- §5.10 in current MR-737 is 'First-class scores and rank fusion', NOT
  'custom index types' / 'connector SPI'. The custom-index-type / plugin
  surface is §5.4 ('Persisted CSR adjacency as Lance index plugin') with
  the capability shape in §5.6.
- §5.11 is 'Substrate choice — DataFusion vs. custom executor (A)'
  (resolved 2026-05-11), NOT 'per-table txn branches'. Per-table Lance
  native txn branches live in §5.12 ('Mutation IR, write planner, and
  external sources') per Ragnor 2026-04-29.
- §5.5 is 'Stable row IDs as graph IDs', NOT 'reconciler pattern'. The
  reconciler is §5.16.
- §5.8 is 'Tiering via Lance base paths', NOT SIP-related. SIP is §5.3.
- The MR-925 §1.6 cross-reference to 'Open Q5' was to a pre-2026-05-11
  numbering; Q5 in current §10 is 'extension rate under filters'.

Each writeup now has a §-numbering note at the top mapping its findings
to the current MR-737 numbering. The findings themselves are unchanged —
this is a numbering-only edit.

Co-Authored-By: Ragnor Comerford <ragnor.comerford@gmail.com>
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Devin AI 2026-05-12 17:44:42 +00:00
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11
.context/experiments/bitmap-pushdown.md
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# Experiment 1.5 — Extending DataFusion dynamic-filter-pushdown to bitmap shape (code-dive)
**Ticket:** MR-925 §1.5 (validates MR-737 §5.6, §5.7 / Open Q3).
**Ticket:** MR-925 §1.5 (validates MR-737 §5.3 "Sideways Information Passing
(SIP) — extends DataFusion's dynamic filter pushdown" + §5.6 "Capability-bearing
storage trait", with implications for §5.7 cost-model).
**§-numbering note:** the original MR-925 cross-reference said "§5.3 / §5.10".
On a full re-read of MR-737: §5.3 is the SIP design and is the correct primary
§ for this experiment; §5.10 in current MR-737 is "First-class scores and rank
fusion" (unrelated). The capability seam that the bitmap pushdown traverses
on the storage side is §5.6 (`scan_by_key_set` capability), so this writeup
also produces deltas for §5.6.
**Type:** Code-dive only (no prototype crate).
**Substrate pin:** DataFusion 52.5.
**Date:** 2026-05-12.