fix(view): the spec→FilterBuilder map follows the four operators #2942 added

[os-zhuang]

Found while implementing objectstack-ai/objectstack#4135 — a concurrent change made a table I added in #2989 quietly wrong.

The drift

CANONICAL_TO_BUILDER (view-config-utils.ts) mapped four canonical VIEW_FILTER_OPERATORS members to null, with a comment asserting the reason:

starts_with/ends_with have no FilterBuilder operator at all, and is_null/is_not_null carry a NULL/empty distinction that isEmpty/isNotEmpty erase

The first half stopped being true. #2942 added startsWith, endsWith, isNull and isNotNull to the FilterBuilder — its own comment says they "validated at the data layer but were unreachable from this dropdown". This table did not follow, so a stored view carrying any of the four still reached the builder as a raw spelling it could by then have rendered, and the comment explaining why was simply false.

All four now map. is_null/is_not_null → isNull/isNotNull, not isEmpty/isNotEmpty: the builder draws both pairs now, so folding the NULL predicate onto the empty-string one would silently rewrite the author's operator the next time the view was saved. The unmapped set is empty — all 19 canonical members translate.

The guard could not have caught this. Now it can.

The parity test asserted that the unmapped set equalled a hand-kept list of gaps. That comparison stays true when the builder gains an operator, because neither side of it moves — the exact drift that happened.

The new assertion is derived rather than hand-kept:

it('leaves nothing unmapped that the builder can already draw', () => {
  const byFolded = new Map(FILTER_BUILDER_OPERATORS.map(id => [fold(id), id]));
  const missed = Object.entries(__CANONICAL_TO_BUILDER)
    .filter(([, id]) => id === null)
    .filter(([op]) => byFolded.has(fold(op)))
    …

starts_with and startsWith fold to the same key, so an unmapped canonical operator whose folded name matches a folded builder id is an omission by definition — no list to remember.

Confirmed it has teeth rather than trusting the green. Reverting the four mappings to null reproduces the original drift as four named failures:

+ "starts_with -> startsWith exists but is unmapped",
+ "ends_with -> endsWith exists but is unmapped",
+ "is_null -> isNull exists but is unmapped",
+ "is_not_null -> isNotNull exists but is unmapped",

Also added an explicit assertion that the NULL and empty-string pairs stay distinct, since that is the one mapping a future edit might be tempted to collapse.

Verification

• plugin-view: 72 tests across 4 files, green (12 in the parity guard, up from 9).
• The guard was confirmed failing before the fix, as quoted above.

Note on scope

This is the same public-API surface as #2989 — toFilterGroup has no in-repo caller — so no in-repo behaviour changes. It is worth fixing because the table is the third of the three the #2901 audit identified, and because a guard that cannot detect a whole class of drift is worse than one that says so.

Refs #2945, #2942, #2989

🤖 Generated with Claude Code

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✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	27.9 KB	350 KB
Entry file	index-QekY3Rio.js	—
Status	PASS	—

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• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped