Captures the post-PR #111 (Lance 4→6) + PR #113 (structured Expr
pushdown) DataFusion state in one place, so future maintainers don't
have to re-derive what's done, what's free, and what's still on the
table from chat history.
Structure:
- Direct touchpoints (only 2 — narrow surface)
- Shipped: PR-by-PR delta of what's landed
- Passive wins active on DF 53 (PR-linked, with where-it-bites-us
notes)
- Still on the table, ranked by tier:
- T1: structural, unblocked today (hydrate_nodes Expr pushdown)
- T2: gated on Lance v7 (delete Expr via MR-A / issue #112)
- T3: future-shape unlocks (extension planner, expression
placement, etc.)
- T4: won't reach us without major changes (custom ExecutionPlan
territory)
- Upstream cadence note (Lance dictates the DF version)
- Maintenance section
Linked from docs/dev/index.md so the check-agents-md CI guard
passes.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
