docs: session handoff 31 — Phase 3 (3c/3d/3e) + interlude close
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# Session handoff — 2026-05-22 (31)
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Thirty-first handover. This session shipped, in order:
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1. **Finished the advanced-mode completion interlude** left open by
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handoff 30 — the **F5** core `walk_seq` fix, plus a follow-up
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`walk_repeated` fix and a candidate-ordering reversal that grew
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out of manual testing.
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2. **Advanced ADR-0033 Phase 3 through sub-phases 3c, 3d, 3e** —
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SQL `INSERT … SELECT`, `shortid` auto-fill, and SQL `UPDATE`.
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The next session should **start sub-phase 3f** (`DELETE` +
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cascade summary) — the largest remaining DML sub-phase — which is
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why we're handing off first. See §4 for a key 3f heads-up.
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## §1. State at handoff
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**Branch:** `main`. **Tests: 1524 passing, 0 failing, 1 ignored.**
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**Clippy:** clean (`cargo clippy --all-targets -- -D warnings`).
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**Commits this session** (newest first). `origin/main` is at
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`6ff9144` (3c), so the **last three are local-only**:
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```
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53808ed grammar+db: 3e — SQL UPDATE grammar + execution (ADR-0033 §2) (local)
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18d34d0 db: 3d fix — don't let shortid auto-fill mask INSERT arity mismatch (local)
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78ad476 db+grammar: 3d — shortid auto-fill for SQL INSERT (ADR-0033 §6) (local)
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6ff9144 grammar: 3c — INSERT … SELECT row source (ADR-0033 §4) (origin/main)
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7f68a53 walker+completion: surface list trailing-optionals + identifiers-first ordering (ADR-0022 Amendment 2)
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43c49f4 walker: F5 — drop preceding-clause keywords from committed-child Incomplete sets
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```
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(Unpushed commits are a normal working state; pushing is the
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user's step — do not prompt about it.)
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## §2. THE process lesson (read this first)
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This session's clearest signal is about **Devil's Advocate
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discipline**, not code. Three times the lead produced a DA
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"verdict" that merely restated the exit gate — and three times the
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*user* had to prompt before a genuine adversarial pass happened.
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Each real pass then found something concrete:
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- "What about more than one shortid in a row?" → an **untested**
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multi-shortid path (it worked, but had zero coverage).
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- "Did you check with the DA?" → the **arity-masking bug** (3d
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auto-fill silently dropped extra columns / could read out of
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range). Real correctness bug; fixed in `18d34d0`.
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- "Sounds like the DA had nothing to add." → the **untested render
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guard** in 3e (`handle_dsl_update_success`).
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**Takeaway for the next agent:** do the adversarial work
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*proactively* and *in writing*, and make it produce a failing test
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or a concrete change — not a paragraph that clears everything.
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"The exit-gate tests pass" is not a DA review. Attack the code:
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untested branches, edge cases the happy-path tests skip, behaviour
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that diverges from the non-SQL path, things that only break when an
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input is malformed. A clean PASS with no findings on a non-trivial
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sub-phase should itself be suspicious.
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## §3. Phase 3 — what shipped (3c / 3d / 3e)
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Controlling docs (read both):
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- `docs/adr/0033-sql-dml-grammar.md` — the decision (read
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**Amendment 1** for the dispatch mechanism).
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- `docs/plans/20260520-adr-0033-phase-3.md` — build order
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(3a–3k), per-sub-phase exit + DA gates.
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### 3c — `INSERT … SELECT` (`6ff9144`)
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Grammar-only: the INSERT row source became a
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`Choice(VALUES_CLAUSE, Subgrammar(&sql_select::SQL_SELECT_COMPOUND))`.
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`SQL_SELECT_COMPOUND` is itself a `Choice` that admits a leading
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`WITH`, so the R4 (WITH-prefixed) row source parses for free. No
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worker change — `do_sql_insert` already executes the validated SQL
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and the engine handles insert-from-query.
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### 3d — `shortid` auto-fill (`78ad476`) + arity fix (`18d34d0`)
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`Command::SqlInsert` gained `listed_columns` and `row_source`,
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extracted in `build_sql_insert` from the matched path (the row
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source is found by the **first `values`/`select`/`with` Word
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token**, which is path-based so a string literal like `'select'`
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can't be mistaken for the keyword). `plan_shortid_autofill`
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(`db.rs`) implements the **user-chosen Option B**: when the column
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list omits a `shortid` column, materialise the row source by
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running it as a query, generate a distinct id per row via the
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existing `generate_shortid_batch` (deduped against stored values),
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and reconstruct a parameterised multi-row INSERT. Uniform for
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VALUES and SELECT; handles multiple omitted shortids (one batch per
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column). `serial` stays engine-filled via rowid. `history.log`
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keeps the original line, never the rewrite (§11).
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**Arity guard (`18d34d0`):** the auto-fill path read exactly
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`listed_columns.len()` cells per row — a column/value arity
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mismatch silently dropped extra columns or read out of range. Now:
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if the materialised statement's `column_count() != listed_count`,
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skip auto-fill and run verbatim so the engine reports the mismatch
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(a friendly pre-flight is 3i).
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Minor deviation from the plan: the plan's 3d step said "turn on
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`writes_user_listed_column`". We did **not** flip that flag — the
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worker only needs the column *names*, collected by role in
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`build_sql_insert`. The flag drives completion-narrowing of VALUES
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against the listed columns, which nothing needs yet. It remains
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`false`; flipping it is a separate completion enhancement, not a
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blocker.
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### 3e — SQL `UPDATE` (`53808ed`)
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New `src/dsl/grammar/sql_update.rs`: `SQL_UPDATE_SHAPE =
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<table> SET col = sql_expr (',' …)* [WHERE sql_expr] [';']`. No
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`--all-rows` rail (ADR-0030 §12). `Command::SqlUpdate { sql,
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target_table }`, `Request::RunSqlUpdate`, `do_sql_update` (execute
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verbatim, re-persist target, history). 3e surfaces the
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**affected-row count only**; precise rows are RETURNING (3g).
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**Two findings that matter for later sub-phases:**
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1. **Cross-cut diagnostics are NOT automatically free.** The
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schema-existence + predicate-warning passes (`mod.rs`) build
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their scope from Tables idents whose **role is `"table_name"`**
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(the pre-pass at `schema_existence_diagnostics`). A bespoke role
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(`update_target_table`) left the SET/WHERE columns unchecked
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(`diag_keys` returned `[]`). Fix: the UPDATE target uses the
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shared `"table_name"` role. **3f's DELETE target must do the
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same** to get the predicate diagnostics on its WHERE for free.
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2. **Render guard.** A column-less `UpdateResult` would render a
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misleading `(no rows)` band. `handle_dsl_update_success` now
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skips `render_data_table` when `result.data.columns.is_empty()`.
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The DSL UPDATE always has columns, so it's unaffected. Covered
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by app-level tests both ways.
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`sql_select::WHERE_CLAUSE` is now `pub(crate)` so the DML
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statements reuse the exact predicate clause.
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## §4. Sub-phase 3f — the next job (DELETE + cascade)
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Per the plan (`docs/plans/20260520-adr-0033-phase-3.md`, "Sub-phase
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3f"): new `src/dsl/grammar/sql_delete.rs` (`DELETE FROM table
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[WHERE] [';']`), `Command::SqlDelete` / `Request::RunSqlDelete` /
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`do_sql_delete`, cascade-summary pre-count (ADR-0033 §7), the
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`format_cascade_summary` formatter **shared** with the DSL
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`do_delete`, and **multi-table persistence** (target + every
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cascade-affected child).
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**Heads-up — the WHERE-byte-extraction problem is tractable for
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DELETE.** In 3e I worried that a flat token path can't distinguish
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a statement-level WHERE from a subquery's WHERE (a `where` token
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can appear before *or* after the statement one). That ambiguity
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comes from UPDATE's `SET` clause possibly holding a subquery-with-
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WHERE *before* the statement WHERE. **DELETE has no SET** — nothing
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before the statement WHERE can contain a subquery — so the
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statement WHERE is simply the **first `where` Word token after the
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target table**, and the predicate text is `source[where_start..]`
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(trim trailing `;`). The R2 invariant
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(`DELETE … WHERE x IN (SELECT … WHERE …)`) is fine: the nested
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subquery WHERE is *inside* the predicate, which is exactly what the
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cascade pre-count wants to inject. So mirror the
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`build_sql_insert` row_source / `build_sql_update` extraction: find
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the first `where` token, capture the clause text into
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`Command::SqlDelete`, and inject it into
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`SELECT <pk> FROM <target> <where_clause>` for each child
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pre-count. When there is no WHERE, the pre-count is unbounded
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(all target rows).
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Other 3f gotchas from the plan's DA gate: the cascade pre-count
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must run **before** the DELETE (the rows being counted are the ones
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about to vanish); cascade-affected child CSVs must all be
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re-persisted; and the SQL path's per-relationship summary must
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match the DSL path's on the same schema/data (shared formatter).
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## §5. Established patterns (reuse these in 3f–3i)
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- **Dev entry word per sub-phase.** SQL DML is isolated behind
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`sqlinsert` / `sql_update` (and `sql_delete` next) entry words,
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`CommandCategory::Advanced` in `REGISTRY`
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(`src/dsl/grammar/mod.rs`). The `build_sql_*` ast-builder
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reconstructs the real keyword (`insert`/`update`/`delete`) +
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matched tail. **3j removes all dev words** and makes
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`insert`/`update`/`delete` shared DSL/SQL entry words; 3j must
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also de-dup the completion entry-word lists once a word appears
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twice in `REGISTRY` (flagged in ADR-0033 Amendment 1).
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- **`table_name` role for any target whose WHERE/SET columns need
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schema diagnostics** (see §3e finding 1).
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- **Static-vs-const in grammar files.** A `Node` referenced *by
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value* in a `static [...]` array must be `const` (so it inlines);
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a `Node` referenced via `&NODE` can be `static`. Getting this
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wrong gives "cannot move out of a shared reference" (hit twice
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in 3e).
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- **Worker result + render.** SQL DML reuses the DSL
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`CommandOutcome::{Insert,Update,Delete}` and the
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`handle_dsl_*_success` renderers. Any new `Command` variant must
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be added to: `command.rs` `verb()` + `target_table()`, the
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`runtime.rs` dispatch, `app.rs` `build_translate_context`, and
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the `tests/typing_surface/mod.rs` `command_kind_label` match
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(all are non-exhaustive checks that will fail to compile until
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covered — a useful forcing function).
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## §6. Escalations settled this session (do not re-litigate)
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- **Identifiers-first candidate ordering** (ADR-0022 Amendment 2):
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schema identifiers sort *before* keywords, globally — the user
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explicitly chose this over the handoff-14 keywords-first
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invariant, after seeing that long SQL keyword runs pushed column
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names off the single-row, window-scrolled candidate line. A
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**two-line hint box** is recorded as a deferred follow-up.
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- **3d SELECT shortid strategy = Option B** (materialise + dedup +
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reinsert), user-confirmed.
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- **`auto_column_overridden` WARNING stays INSERT-only** (the plan
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default). 3e did not extend it to UPDATE; if 3f/3i wants to, the
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plan says escalate.
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## §7. Still deferred (tracked, not lost)
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- **RETURNING** (3g) — precise DML row output; 3e/3f surface counts
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(+ cascade summary) only until then.
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- **UPSERT `ON CONFLICT`** (3h), **diagnostics** `insert_arity_mismatch`
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/ `auto_column_overridden` / `not_null_missing` (3i),
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**dispatch wiring / dev-word removal** (3j), **verification
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sweep** (3k).
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- **Old-project migration** (from handoff 30 §4) — the pre-
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`check_expr` 3-column `__rdbms_playground_columns` schema; the
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user deferred a migration story to "the end". Targeted fix when
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the migration framework (ADR-0015 Iter 6) lands.
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- **Two-line hint box** (ADR-0022 Amendment 2).
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- **`writes_user_listed_column`** flag (see §3d) — VALUES-against-
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listed-columns completion narrowing.
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## §8. Process pins (unchanged, still binding)
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- **Confirm every commit.** Propose the message and wait for the
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go-ahead. No auto-commit at sub-phase gates.
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- **Push is the user's step.** Never push; never prompt about it.
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- **No AI attribution** in commits (global rule).
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- **Test-first.** Reproduce a bug with a FAILING test before
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fixing; for features, exit-gate tests before "done". This is
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also how the real DA findings surfaced this session — write the
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cross-cut/edge test and watch it fail.
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- **Core walker changes** (`walk_seq` / `walk_choice` /
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`walk_repeated`) need explicit user OK before coding. (F5 and the
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3d-era `walk_repeated` change both went through this.)
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- **Escalate ambiguity; never classify work out of scope without
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user confirmation.**
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## §9. How to take over
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1. **Read, in order:** this file →
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`docs/adr/0033-sql-dml-grammar.md` (esp. §7 cascade + §2
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UPDATE, already shipped) →
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`docs/plans/20260520-adr-0033-phase-3.md` "Sub-phase 3f" →
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`CLAUDE.md`.
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2. **Baseline:**
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```
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cargo test # expect 1524 passing / 0 failing / 1 ignored
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cargo clippy --all-targets -- -D warnings # clean
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```
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3. **Start 3f** per §4. Mirror `sql_update.rs` for the grammar and
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`do_sql_update` for the worker shell; the new work is the
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cascade pre-count + the shared `format_cascade_summary` refactor
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+ multi-table persistence. Use the `table_name` role for the
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DELETE target. Capture the WHERE clause text via the first
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`where` token (tractable for DELETE — §4).
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4. **Do the DA pass for real** (§2). On a sub-phase this size,
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expect to find at least one untested branch or edge case;
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if you don't, look harder.
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5. **Escalate** anything not settled in ADR-0033 / the plan.
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