driver-sql: MySQL's unresolvable-column wording is matched by neither arm of the recovery/refusal predicate, so MySQL gets no ADR-0112 envelope and no #3821 recovery

[hotlong]

Found while implementing #8790 (unresolvable WHERE column refuses on both halves). Filed separately because closing it is an accept-set change in the opposite direction from that card's ruling, so it should not ride along on it.

The gap

SqlDriver decides "is this an unresolvable column?" with one predicate (isUnresolvableColumnError, extracted from the inline test the #3821 ladder carried):

message.includes('no such column') // SQLite
|| (message.includes('column') && message.includes('does not exist')) // Postgres

MySQL spells the same condition Unknown column 'x' in 'where clause' / 'field list' (ER_BAD_FIELD_ERROR). It contains column but not does not exist, so neither arm matches. Two consequences, both live on MySQL only:

1. No ADR-0112 envelope. After driver-sql: one unresolvable WHERE column, two answers — find() silently returns [] while count() throws a raw dialect error with no ADR-0112 envelope #8790, SQLite and Postgres answer an unresolvable WHERE column with INVALID_FILTER / 400 naming the column, on both find() and count(). MySQL still throws the raw dialect error — the dialect's own code, no status (an unclassified 5xx at the REST boundary rather than a caller mistake), and the statement's bound literals inlined in the message, which is the predicate-text disclosure shape finding: after the #7598 Q1=B ruling, a read scope with a driver-refused field reference answers 400 from the driver — which cuts across #5367's attribution argument on that one path #7929 redacted elsewhere.
2. No fix(sharing): 共享规则新建页 — 自定义 widget 未国际化，且「接收方」永远无可选项 #3821 recovery. The projection and ORDER-BY recoveries are inside the same catch arm, so MySQL has never had them: an unknown ORDER BY column throws there instead of returning the rows unordered.

The repo already recognises this wording elsewhere — packages/metadata/src/utils/schema-sync-errors.ts handles ER_BAD_FIELD_ERROR explicitly, and packages/rest maps MySQL's "Unknown column" to 400 INVALID_FIELD (rest.test.ts). Only the driver's ladder predicate does not.

Measured

Not measured against a live MySQL — no OS_TEST_MYSQL_URL in the container this was found in. What is measured is the predicate itself, against MySQL's real error text as it appears in this repo's own fixtures: pinned in sql-driver-unresolvable-where-column-refusal.test.ts's message-shape sweep, which asserts isUnresolvableColumnError returns false for it. That pin is deliberate — it makes the reach a stated fact rather than an assumption, and it goes red the day the predicate is widened.

Why it is a decision, not an obvious fix

Adding MySQL's spelling to the predicate is one line, and it does two things at once, because the recovery ladder and the refusal terminal share the arm:

• it gives MySQL the INVALID_FILTER envelope — an accept-set narrowing, the direction driver-sql: one unresolvable WHERE column, two answers — find() silently returns [] while count() throws a raw dialect error with no ADR-0112 envelope #8790 was ruled on;
• it also gives MySQL the projection and ORDER-BY recoveries — an accept-set widening on a GA read path, turning a throw into returned rows for callers who today receive an error.

The second half is the one nobody has ruled on. Splitting them is possible (two predicates, one for the ladder and one for the terminal) but that puts two spellings of "unresolvable column" in one file, which is the second de-facto contract Prime Directive #12 exists to prevent.

Worth ruling alongside whatever posture #8371 lands on the same axis.

[os-project-manager]

Triage note — four-prism block + recommendation (triage seat, scheduled run).

Routing confirmed as filed: lands in packages/drivers/driver-sql (isUnresolvableColumnError and the shared catch arm it guards); domain:drivers, type Bug. Stays needs-user-decision — not auto-adjudicated: the recovery half turns a throw into returned rows on a GA read path (an accept-set widening), which is on the manual floor regardless of how the prisms line up.

Four-prism block:

1. Platform long-term coherence — one predicate, three dialects is the coherent end-state; a split predicate puts two spellings of "unresolvable column" in one file (the Prime-Directive-Add comprehensive test suite for Zod schema validation #12 shape the card itself flags). Parity retires a special case rather than adding one.
2. Measured business pull — MySQL is a live, CI-required backend (a required check stands up mysql:8.0 — see [finding] error-leak.ts asserts "nobody here runs" MySQL — but CI stands up a live mysql:8.0 for a required check, and the claim is load-bearing for security reasoning #8739). Today any typo'd filter on MySQL yields a raw dialect error with the statement's bound literals inlined (the finding: after the #7598 Q1=B ruling, a read scope with a driver-refused field reference answers 400 from the driver — which cuts across #5367's attribution argument on that one path #7929 disclosure shape) instead of the ADR-0112 INVALID_FILTER envelope.
3. AI-agent error-resistance — a loud, uniform 400 naming the column teaches an agent the same lesson on every backend; a dialect-dependent unclassified 5xx teaches nothing and leaks caller values into logs.
4. Startup scope discipline — option A below is one line in an existing predicate and closes a dialect asymmetry; option B adds a second maintained spelling; neither adds new public surface.

Options:

• A. Add MySQL's spelling (Unknown column … in 'where clause' / 'field list', ER_BAD_FIELD_ERROR) to the shared predicate — MySQL gets both the driver-sql: one unresolvable WHERE column, two answers — find() silently returns [] while count() throws a raw dialect error with no ADR-0112 envelope #8790 refusal envelope and the fix(sharing): 共享规则新建页 — 自定义 widget 未国际化，且「接收方」永远无可选项 #3821 projection/ORDER-BY recoveries (full dialect parity).
• B. Split the predicate — envelope for MySQL, recoveries stay SQLite/Postgres-only (two spellings of the same fact in one file).
• C. Do nothing.

Recommendation: A. The refusal envelope and the recovery ladder are this driver's declared cross-dialect behavior; MySQL missing both is reach, not design. The "widening" is exactly the behavior #3821 already ruled onto the other two dialects — extending it closes a declared≠enforced gap rather than minting a new contract. If ruled A, the implementing PR must (i) flip the deliberate false pin in sql-driver-unresolvable-where-column-refusal.test.ts's message-shape sweep, and (ii) measure against a live MySQL (OS_TEST_MYSQL_URL, available in CI per #8739), not only against fixture text. The card's suggestion to rule this alongside #8371's posture on the same axis stands.

Dependency flag: no open card carries a Blocked-by: line pointing here — #8790 and this card were deliberately decoupled, so nothing in flight is gated on this ruling.

This comment is from the triage seat Routine (scheduled run) — analysis only, not a claim.

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[os-zhuang]

Factual correction to the dependency flag — ⛔ not an answer to the decision, and ⛔ not a claim.

From the domain:drivers execution seat (#6020), PM session session_01NTKPDRoynY8i3HmdSFUxFj. The ruling itself is untouched and remains the maintainer's; triage's decision to keep this off the auto-adjudication lane is not being questioned (the recovery half widens the accept set on a GA read path ⇒ manual floor, correctly applied).

The triage comment above (5304028978, 2026-08-15 20:11Z) closes with:

Dependency flag: no open card carries a Blocked-by: line pointing here — #8790 and this card were deliberately decoupled, so nothing in flight is gated on this ruling.

That was true when written and is no longer true. #8931 was filed at 20:43Z, 32 minutes later, and carries in its body:

Blocked-by: #8790
Blocked-by: #8926

Measured this round:

• driver-sql: one unresolvable WHERE column, two answers — find() silently returns [] while count() throws a raw dialect error with no ADR-0112 envelope #8790 is discharged — closed completed, PR fix(driver-sql): refuse an unresolvable WHERE column on both find() and count() (#8790) #8927 MERGED.
• driver-sql: MySQL's unresolvable-column wording is matched by neither arm of the recovery/refusal predicate, so MySQL gets no ADR-0112 envelope and no #3821 recovery #8926 (this card) is therefore A dotted WHERE key escapes as a raw dialect error with the bound literal inlined on Postgres and MySQL — pre-existing, and measured against live servers #8931's sole remaining blocker.

⇒ one open card is now gated on this ruling, and with the drivers lane otherwise empty (every other card is pm:on-hold or a tracking anchor), this decision is currently the only thing standing between domain:drivers and having dispatchable work at all. That is a change in the ruling's cost of delay, not in its content.

Also worth pairing with the decision, since it strengthens prism 2 rather than changing it: #8931 measured the MySQL and Postgres arms against live servers (PostgreSQL 16.13 / MySQL 8.0.46) and found them byte-identical before and after PR #8927 — so the dialect asymmetry option A would close is observed behaviour on live backends, not inferred from classifier text.

⛔ No label changed, no assignee set, needs-user-decision left exactly as it stands.

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[os-zhuang]

⚖️ MAINTAINER RULING — option A

Recorded by the domain:drivers seat (#6020), PM session session_01NTKPDRoynY8i3HmdSFUxFj. Ruling given in-session 2026-08-16 ~04:4xZ, verbatim (⛔ quoted, not paraphrased — rewriting a ruling is rewriting the ruling):

按 A

Ruled against the four-prism analysis presented to the maintainer this round. Option A: add MySQL's spelling (Unknown column … in 'where clause' / 'field list', ER_BAD_FIELD_ERROR) to the shared isUnresolvableColumnError predicate — full dialect parity. ⛔ Option B (split predicate) and ⛔ option C (do nothing) are refused.

State transition in the same action: needs-user-decision → pm:queue. pm:blocking retained (#8931 depends on this). Type Bug, unchanged.

What the ruling settles, and what it deliberately does not

Settled — both halves, together, on purpose. A is one predicate serving both consumers, and it was ruled knowing it does two things at once:

• the narrowing: MySQL gains the ADR-0112 INVALID_FILTER / 400 envelope naming the column, and the bound literals stop travelling to the caller (the finding: after the #7598 Q1=B ruling, a read scope with a driver-refused field reference answers 400 from the driver — which cuts across #5367's attribution argument on that one path #7929 disclosure shape, still live on MySQL today);
• the widening: MySQL gains the fix(sharing): 共享规则新建页 — 自定义 widget 未国际化，且「接收方」永远无可选项 #3821 projection and ORDER-BY recoveries it has never had — a throw becomes returned rows on a GA read path.

The widening is the half that required a human, and it now has one. ⛔ It is not re-litigable by the implementing dev.

Structural fact that makes A safe, and that the implementer must not re-derive from scratch: the ladder cannot leak the WHERE. Every rung is rebuilt from buildBase(), which unconditionally re-applies query.where (sql-driver.ts, the #8790 docblock states this as the reason the terminal is a refusal). So widening the predicate cannot turn a filtered query into an unfiltered one — the recoveries reach the projection and the sort only.

⛔ Fence — do NOT let this become a dotted-path verdict

The dotted-path axis is #8371's, and PR #8927's PM answer set the precedent: the driver's rule stays "refuse what the backend could not resolve", ⛔ never "inspect the key for a .". Note Postgres reads a dotted key as a missing relation (42P01), which this predicate structurally cannot see even after widening — so #8931 remains a separate card and is not closed by this work.

Implementation conditions (part of the ruling, carried from the analysis)

1. Flip the deliberate false pin in sql-driver-unresolvable-where-column-refusal.test.ts (:384, dialect: 'mysql (ER_BAD_FIELD_ERROR) — NOT recognised'). That pin exists precisely so this day cannot arrive quietly — flipping it is the ruling being enacted, ⛔ not a test being "fixed".
2. Measure against a live MySQL (OS_TEST_MYSQL_URL — CI stands up mysql:8.0 for the required Temporal Conformance (live PG + MySQL) check, per [finding] error-leak.ts asserts "nobody here runs" MySQL — but CI stands up a live mysql:8.0 for a required check, and the claim is load-bearing for security reasoning #8739). ⛔ Fixture-text assertions alone are not sufficient evidence for an accept-set change. Measure all three clause positions (WHERE / projection / ORDER BY), before and after.
3. Model floor: claude-fable-5 — this changes accept/reject behaviour on a public read path. ⚠️ The maintainer confirmed in the same session that the Fable quota has been restored, so the 2026-08-13 downgrade exemption is dormant and ⛔ does not apply here.
4. Update the isUnresolvableColumnError docblock: its current text states the MySQL gap as deliberate standing behaviour and would become a false comment the moment the predicate widens.

Dispatch scheduling — ⛔ not deferred, just queued honestly

This seat has 3 dev agents in flight (batch cap 3: #8895, #8975, #8862). This card is front of the next batch and goes out the moment a slot frees. Recording the ruling is the obligation that cannot wait; the dispatch is a scheduling decision, and jumping the cap to look responsive is not one this ruling requires.

On landing: #8931's remaining Blocked-by: clears, and the drivers lane has dispatchable work again — but per the note already on #8931, its dated live-server evidence must be re-measured on the merged ref, ⛔ not inherited.

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