docs: session handoff 29 — Phase 3 planning done; sub-phase 3a is next
Twenty-ninth handover. This session drafted ADR-0033 as the planning artifact for ADR-0030 Phase 3 (SQL DML in Advanced mode). Documents the ten settled design decisions (Q1-Q10), the dispatch architecture (SQL-first / DSL-fallback via the new Node::Guard mechanism), the eleven phased sub-phases (3a-3k) each with their exit gates, and the open implementation risks (R1-R4). Points the next session at sub-phase 3a (Node::Guard scaffolding) as the concrete entry point, with the plan-doc cross-cut matrix as the immediate prerequisite task. Pins four process lessons from the Phase-2 session (DA rubber-stamp risk, defer-trap reflexes, tests-first on gap closure, matrix attribution verification). State: 1446 / 0 / 1 passing (unchanged — planning-only session). Clippy clean.
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# Session handoff — 2026-05-20 (29)
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Twenty-ninth handover. This session **closed ADR-0032 Phase 2**
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(see `docs/handoff/20260520-handoff-28.md`) and **drafted
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ADR-0033** as the planning artifact for ADR-0030 Phase 3 (SQL
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DML in Advanced mode). The next session starts implementation
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at **sub-phase 3a** — see §3 below for the concrete entry point.
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## §1. State at handoff
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**Branch:** `main`. The Phase-2 commits were pushed by the user
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mid-session; the Phase-3 planning commits in this session are
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local-only and ready to be pushed at the user's convenience.
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**Tests:** **1446 passing, 0 failing, 1 ignored** (unchanged
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from handoff-28 — Phase 3 is planning-only this session).
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**Clippy:** clean.
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**This session's commits (Phase 3 planning):**
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```
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<this handoff>
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<ADR-0033 + README index commit, pending>
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fa417a4 docs: session handoff 28 — Phase 2 closed; Phase 3 is next
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```
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(All Phase-2 implementation commits are already pushed; see
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handoff-28 §1 for the full list.)
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## §2. Phase 3 design — settled
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Ten design questions were discussed and settled in this session.
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The full rationale lives in **`docs/adr/0033-sql-dml-grammar.md`**;
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this is the index:
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| Q | Topic | Decision |
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|-----|----------------------------------------------------------------|---------------------------------------------------------------------------------------------------------|
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| Q1 | `INSERT … SELECT` as a row source | **In scope** — recurses through `SQL_SELECT_COMPOUND` |
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| Q2 | `INSERT INTO t DEFAULT VALUES` | **OOS** — the planned seed feature covers this case |
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| Q3 | `RETURNING` clause on INSERT / UPDATE / DELETE | **In scope** on all three |
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| Q4 | UPSERT (`ON CONFLICT … DO NOTHING / DO UPDATE`) | **Full UPSERT in scope** — including `excluded` pseudo-table |
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| Q5 | `INSERT OR REPLACE / IGNORE / ABORT / FAIL / ROLLBACK` | **OOS** — SQLite-specific |
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| Q6 | `UPDATE table FROM other_table` (multi-table) | **OOS** — SQLite/PostgreSQL extension, confusing pedagogically |
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| Q7 | `shortid` auto-fill on SQL INSERT | **Worker post-fill** (parity with DSL `do_insert`) |
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| Q8a | INSERT column-count arity mismatch | **Walker ERROR diagnostic** — `diagnostic.insert_arity_mismatch` |
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| Q8b | Auto-gen column override warning | **Walker WARNING** — `diagnostic.auto_column_overridden` |
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| Q8c | NOT-NULL-missing-on-INSERT | **Walker WARNING (advisory)** — `diagnostic.not_null_missing` |
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| Q9 | Cascade summary on SQL DELETE | **Parity with DSL** — shared formatter, WHERE-clause byte-range injection into pre-count subqueries |
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| Q10 | `Command` shape for DML execution | **Three typed variants** — `SqlInsert` / `SqlUpdate` / `SqlDelete` |
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**Dispatch architecture (the hardest call):** Advanced mode runs
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SQL-first with DSL fallback via `Choice(SQL_shape, DSL_shape)`
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per shared entry word. The mode-gating mechanism requires a new
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walker capability — `Node::Guard(fn)`, a zero-byte-consumption
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gating node — which is the very first sub-phase's work (§3a in
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the ADR).
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## §3. Where the next session starts
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**Sub-phase 3a — `Node::Guard` + mode-gated Choice mechanism.**
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This is the foundation; if it doesn't work cleanly, the
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mitigation paths (alternative dispatch mechanisms) are evaluated
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before any DML grammar lands. ADR-0033 §"Open implementation
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risks" R1 budgets for this explicitly.
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**Concrete first-day tasks:**
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1. **Read** the following, in order:
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- This handoff (you're already doing it).
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- `docs/handoff/20260520-handoff-28.md` (Phase 2 closing
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state + the four non-blocking observations).
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- `docs/adr/0030-advanced-mode-sql-surface.md` (the source
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roadmap).
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- `docs/adr/0033-sql-dml-grammar.md` (the Phase-3 grammar
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ADR — the controlling document for all DML decisions).
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- `CLAUDE.md` (project conventions; DA discipline reminder
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in particular).
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2. **Run baseline:**
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```
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cargo test # expect 1446 / 0 / 1
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cargo clippy --all-targets -- -D warnings # clean
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```
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3. **Write the Phase-3 implementation plan doc** at
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`docs/plans/<date>-adr-0033-phase-3.md`, modelled on
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`docs/plans/20260520-adr-0032-phase-2.md`. ADR-0033's
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per-sub-phase exit gates are detailed enough that the
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plan doc can be focused on the **cross-cut verification
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matrix scaffold** (the rows to fill in during 3k). Suggested
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matrix sources:
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- ADR-0033 §1 (statement shapes) — one row per shape per
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row-source variant (VALUES single, VALUES multi-row,
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INSERT…SELECT, …).
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- ADR-0033 §2 (dispatch) — one row per mode × DSL/SQL
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branch.
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- ADR-0033 §5 (RETURNING) — one row per statement kind.
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- ADR-0033 §6 (shortid auto-fill) — single-row, multi-row,
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INSERT…SELECT, override case.
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- ADR-0033 §7 (cascade summary) — DSL parity row + WHERE
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subquery case (R2 mitigation).
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- ADR-0033 §8 (diagnostics) — positive + negative per key.
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- ADR-0033 §9 (UPSERT) — DO NOTHING + DO UPDATE rows.
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4. **Implement sub-phase 3a** per ADR-0033 §Implementation
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notes:
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- Add `Node::Guard(fn(&WalkContext) -> Result<(),
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ValidationError>)` to `src/dsl/grammar/mod.rs::Node`.
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- Add `walk_guard` to `src/dsl/walker/driver.rs`.
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- Add the `reject_sql_in_simple_mode` guard function.
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- Build the smoke-test grammar (a single experimental
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`CommandNode` with a `Choice(SQL_branch_gated,
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DSL_branch)` shape that uses two distinguishable tokens).
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- Verify the four exit-gate test cases in ADR-0033 §3a.
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5. **DA gate (sub-phase 3a):** apply the written DA gate from
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ADR-0033 §3a verbatim. The "Does the Guard actually fire
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BEFORE the Seq commits?" question is the make-or-break
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test — write that test explicitly. If it fails, R1's
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mitigation reopens sub-phase 3a with mechanism option (b)
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or (c).
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6. **Commit** with a message that explicitly names the
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mechanism choice (a/b/c) actually used. If you had to fall
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back to option (b) or (c), update ADR-0033 §2's "Default
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choice" sentence in the same commit.
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## §4. Process pins from this session
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These are NOT new project rules — they're lessons reinforced
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this session that the next session should keep in mind.
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### 4.1. DA discipline — first pass is rubber-stamp risk
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Phase 2's verification report shipped with a rubber-stamp PASS
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on the first DA pass. The user had to challenge it to get
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specific critiques. This session's ADR-0033 DA review took two
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passes: the first pass produced seven specific critiques, all
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addressed in the body; the second pass surfaced an eighth real
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gap (the `Node::Guard` capability didn't exist) and added it.
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**Pin for sub-phase exits:** DA review lists specific critiques
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first, concludes after. A clean PASS without critiques is a
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process failure even if the work is sound — the DA hat has to
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PROVE engagement.
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### 4.2. Defer-trap reflexes
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Phase 2 surfaced this pattern repeatedly: when scope expanded,
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the implementer's reflex was to label items "out of scope" or
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"non-blocking" without user approval, per CLAUDE.md's explicit
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prohibition. The user corrected this several times.
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**Pin for Phase 3:** every "out of scope" classification must
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either (a) be already declared OOS by an ADR, or (b) be
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escalated to the user. The default is "in scope, in this
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sub-phase, now."
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### 4.3. Tests-first on gap closure
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Phase 2's 2g rework added 13 tests AFTER the gaps were
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discovered, not before. The work was sound but the ordering was
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backwards.
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**Pin for Phase 3:** when a sub-phase's exit gate exposes a gap
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in an earlier sub-phase, write the failing test FIRST, then fix.
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This is the bug-fix discipline from CLAUDE.md applied to
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gap-closure.
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### 4.4. Matrix attribution must be SQL tests, not DSL tests
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Phase 2's matrix row "validity indicator fires for SQL" was
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attributed to a DSL test (the user-visible bug it left was
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fixed in the rework). Generalisable lesson:
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**Pin for Phase 3:** when filling the matrix in sub-phase 3k,
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each row pointing at a SQL surface must point at a test whose
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INPUT is SQL syntax. Cross-check at attribution time, not at
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DA-review time.
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## §5. Pinned non-blocking observations from Phase 2
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These items are from `docs/handoff/20260520-handoff-28.md` §3.
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**They're not blockers for Phase 3** but a Phase-3 implementer
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may decide to address one or more if they're nearby:
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- §3.1 `translate_generic`'s "group by" pattern overbreadth in
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`src/friendly/translate.rs`.
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- §3.2 Look-ahead probe cost in `src/completion.rs` — second
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walk per Tab press when leading scope is empty; not
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benchmarked.
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- §3.3 Process: tests-after-code on matrix coverage.
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- §3.4 Process: matrix attribution wasn't verified row-by-row.
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## §6. Open work — unchanged from handoff-28
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Same list as handoff-28 §6. Phase 3 (this session's planning
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target) is one of the items; the others remain:
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- Project storage Iter 5/6.
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- Snapshot / replay / undo (U-series).
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- m:n convenience (C4); modify relationship (C3a); rename
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table (C1); column drops/renames/type changes (B2/C2).
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- Friendly-error sweep (H1); strong syntax-help in parse
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errors (H1a).
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- CI (TT5).
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- Session log + Markdown export (V4).
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- Readline shortcuts (I1b), multi-line input (I1), tab
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completion polish (I3), syntax highlighting (I4).
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- ER diagram export (V3).
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- Tutorial / lesson system.
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## §7. How to take over
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1. **Read this file in full.** Then handoff-28, then
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ADR-0033, then `CLAUDE.md`.
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2. **`cargo test`** — expect **1446 passing, 0 failed, 1
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ignored**.
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3. **`cargo clippy --all-targets -- -D warnings`** — clean.
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4. **First task: write the Phase-3 plan doc** (per §3 step 3).
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Don't skip this — the cross-cut matrix is the scaffolding
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that lets sub-phases 3b–3k know what they're aiming at.
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5. **Second task: sub-phase 3a** (`Node::Guard` + mode-gated
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Choice mechanism). Per §3 steps 4–6.
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6. **Escalate** any ambiguity not already settled in ADR-0033.
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Don't decide silently; don't classify items "out of scope"
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without checking.
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