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+---
+"@objectstack/service-analytics": patch
+---
+
+The draft-data preview **refuses** a `where` operator it cannot evaluate instead of answering it for every row, so a drafted chart no longer silently ignores a filter and then changes at publish (#19810).
+
+`preview-evaluator.ts` evaluates a pending seed draft's rows in memory — the ADR-0037 P3 Live Canvas path — and its operator switch carried ten cases (`$eq`, `$ne`, `$gt`, `$gte`, `$lt`, `$lte`, `$between`, `$in`, `$nin`, `$contains`) and then `default: return true; // unknown operator — permissive (preview, reads only)`. Every other declared operator therefore matched EVERY row: `$icontains`, `$notContains`, `$startsWith`, `$endsWith`, `$null`, `$exists`, the staged `$like` / `$ilike`, and any typo. A drafted chart with `name $icontains 'acme'` charted the whole dataset and looked exactly like a working chart; the published chart, which runs the real filter doors, applied the filter.
+
+- **Fail-closed, and VISIBLE.** The operator is refused in the ADR-0112 `INVALID_FILTER` / 400 envelope this package's `where` door already speaks, through `filter-normalizer`'s exported `invalidFilterError`. No new error code and no new exported symbol. Refused rather than excluded from the result: an excluded row makes the preview merely *different* from publish — zero rows where publish draws numbers — which is the silent shape `lowerPreviewDateRange` abolished on this same evaluator; only a refusal reaches the author who can fix it. It is the call `uncompilableFieldOperatorError` states for the analytics cube face, and the posture `service-analytics` already takes for `$like` / `$ilike`.
+- **The vocabulary and the evaluator are now ONE table**, the shape `memory-analytics`' `MONGO_TO_CUBE_OPERATOR` took for this same defect class: adding a row is the only way to widen what this face accepts, and forgetting to add one is a loud refusal rather than a wrong number.
+- **The gate does not depend on the data.** It walks `where` before any row is read, so a seed draft holding zero rows — the state a draft is authored in — refuses too instead of answering an empty chart.
+- ⚠️ **What it costs**: a drafted chart whose filter uses one of those operators now returns `400 INVALID_FILTER` in preview where it previously rendered a number. That number was computed over rows the filter excludes, and it changed at publish. Growing the preview's arms is deliberately separate work — the `FILTER_OPERATORS` docblock's ruling that a name must not land ahead of its evaluators reads the same in this direction, so an arm joins the table in the PR that measures it against the shared conformance kits.
+- **The ten evaluated arms are byte-for-byte unchanged**, pinned in both directions (a matching row still matches, a non-matching row still does not).
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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#19810] The draft-preview matcher answers operators it cannot evaluate.
+ *
+ * ## The enumeration, read at `origin/main` (`c1dfa5241b`) before any edit
+ *
+ * `preview-evaluator.ts`'s `matchOp` switch carried exactly TEN cases —
+ * `$eq`, `$ne`, `$gt`, `$gte`, `$lt`, `$lte`, `$between`, `$in`, `$nin`,
+ * `$contains` — and then, at `:109`:
+ *
+ * ```
+ * default: return true; // unknown operator — permissive (preview, reads only)
+ * ```
+ *
+ * So every OTHER operator matched EVERY row. Against the declared vocabulary
+ * (`FILTER_OPERATORS`, plus the staged `$like` / `$ilike`) the silent set was
+ * `$notContains`, `$startsWith`, `$endsWith`, `$icontains`, `$null`,
+ * `$exists`, `$like`, `$ilike` — and any typo besides. A drafted chart with
+ * `name $icontains 'acme'` charted the whole dataset; the published chart,
+ * which runs the real filter doors, applied the filter. Same shape the file's
+ * own `$between` case records for itself (#4081) and `lowerPreviewDateRange`
+ * closed for the date-range vocabulary (#16322).
+ *
+ * ## What this file pins, in the two directions the repair has
+ *
+ * 1. **Fail-closed.** An operator with no arm is REFUSED — `INVALID_FILTER` /
+ *    400, the envelope this package's `where` door already speaks — and the
+ *    row it does not match is NOT answered. Refused rather than merely
+ *    excluded: an excluded row makes the preview silently DIFFERENT from
+ *    publish, which is the failure #16322 abolished on this same evaluator;
+ *    a refusal makes the divergence visible to the author who can fix it.
+ * 2. **Unchanged.** The ten operators the face DOES evaluate answer exactly
+ *    what they answered before, in both directions (a matching row matches, a
+ *    non-matching row does not). A fail-closed default that starts rejecting
+ *    rows which used to match correctly is the mirror-image defect.
+ *
+ * The refusal is pinned by its `code` + `status` (ADR-0112), not by prose: a
+ * bare `toThrow()` would be satisfied by any uncoded error, including the
+ * `TypeError` a malformed filter raises on its own.
+ */
+
+import { describe, it, expect, vi } from 'vitest';
+import { DatasetSchema } from '@objectstack/spec/ui';
+import { FILTER_OPERATORS } from '@objectstack/spec/data';
+import type { Cube } from '@objectstack/spec/data';
+import { AnalyticsService } from '../analytics-service.js';
+import { evaluateAnalyticsQueryOverRows, matchesWhere } from '../preview-evaluator.js';
+
+// ── fixture ─────────────────────────────────────────────────────────────────
+
+const ROWS: Record<string, unknown>[] = [
+  { id: '1', name: 'Acme Corp', amount: 1200, spent_on: '2026-05-03' },
+  // ⭐ the row `name $icontains 'acme'` does NOT match. Before the repair the
+  //    preview answered it anyway; the published chart never did.
+  { id: '2', name: 'Globex', amount: 800, spent_on: '2026-05-12' },
+];
+
+const DATASET = DatasetSchema.parse({
+  name: 'expense_ds',
+  label: 'Expense',
+  object: 'expense',
+  dimensions: [{ name: 'name', field: 'name', type: 'string', label: 'Name' }],
+  measures: [{ name: 'count', aggregate: 'count' }],
+});
+
+const CUBE: Cube = new AnalyticsService().registerDataset(DATASET).cube;
+
+/** The dimension values the preview ANSWERS — empty when it refuses. */
+function namesAnswered(where: Record<string, unknown>, rows = ROWS): string[] {
+  try {
+    const result = evaluateAnalyticsQueryOverRows(
+      { cube: 'expense_ds', measures: ['count'], dimensions: ['name'], where },
+      CUBE,
+      rows,
+    );
+    return result.rows.map((r) => String(r.name));
+  } catch {
+    return [];
+  }
+}
+
+/** The error a preview refuses with, or `undefined` if it answered. */
+function refusalFor(where: Record<string, unknown>, rows = ROWS): (Error & { code?: string; status?: number }) | undefined {
+  try {
+    evaluateAnalyticsQueryOverRows(
+      { cube: 'expense_ds', measures: ['count'], dimensions: ['name'], where },
+      CUBE,
+      rows,
+    );
+    return undefined;
+  } catch (e) {
+    return e as Error & { code?: string; status?: number };
+  }
+}
+
+// ── direction 1 — an operator with no arm must not answer every row ─────────
+
+describe('[#19810] an operator the draft preview cannot evaluate', () => {
+  it('does NOT answer the row that `name $icontains "acme"` excludes', () => {
+    // ⛔ Before the repair this read `['Acme Corp', 'Globex']`: the `default`
+    //    arm answered true for both rows, so the drafted chart counted Globex
+    //    into a filter that excludes it.
+    expect(namesAnswered({ name: { $icontains: 'acme' } })).not.toContain('Globex');
+  });
+
+  it('refuses it in the ADR-0112 `INVALID_FILTER` / 400 envelope', () => {
+    const err = refusalFor({ name: { $icontains: 'acme' } });
+    expect(err).toBeInstanceOf(Error);
+    expect(err).toMatchObject({ code: 'INVALID_FILTER', status: 400 });
+    // The operator and the face's own vocabulary are both in the message, so
+    // the author can see which spelling to reach for.
+    expect(err?.message).toContain('$icontains');
+    expect(err?.message).toContain('$contains');
+  });
+
+  it('refuses over an EMPTY seed draft too — the walk is not a function of the data', () => {
+    // The state a draft is authored in. A per-row refusal never fires here, so
+    // the preview would answer `count: 0` for a filter it cannot evaluate.
+    const err = refusalFor({ name: { $icontains: 'acme' } }, []);
+    expect(err).toMatchObject({ code: 'INVALID_FILTER', status: 400 });
+  });
+
+  it('refuses inside `$or`, `$and` and `$not` arms', () => {
+    for (const where of [
+      { $or: [{ name: { $startsWith: 'Ac' } }, { amount: { $eq: -1 } }] },
+      { $and: [{ name: { $endsWith: 'Corp' } }] },
+      { $not: { name: { $notContains: 'zzz' } } },
+    ]) {
+      expect(refusalFor(where)).toMatchObject({ code: 'INVALID_FILTER', status: 400 });
+    }
+  });
+
+  it('refuses a constraint key that names an Object.prototype member', () => {
+    // A table keyed by a plain object literal would resolve `toString` to the
+    // inherited function and CALL it as a predicate; a `Map` cannot.
+    expect(refusalFor({ name: { toString: 'Acme' } })).toMatchObject({
+      code: 'INVALID_FILTER',
+      status: 400,
+    });
+  });
+
+  /**
+   * The declared vocabulary, minus the ten arms this face carries. Derived
+   * from `FILTER_OPERATORS` rather than hand-listed, so an operator added to
+   * the protocol without an arm here lands in this table by itself instead of
+   * going silent.
+   */
+  const EVALUATED = ['$eq', '$ne', '$gt', '$gte', '$lt', '$lte', '$between', '$in', '$nin', '$contains'];
+  const UNEVALUATED = [...FILTER_OPERATORS, '$like', '$ilike'].filter((op) => !EVALUATED.includes(op));
+
+  it('has a non-empty unevaluated set — otherwise the table below asserts nothing', () => {
+    expect(UNEVALUATED).toEqual(
+      expect.arrayContaining(['$notContains', '$startsWith', '$endsWith', '$icontains', '$null', '$exists', '$like', '$ilike']),
+    );
+  });
+
+  it.each(UNEVALUATED)('%s is refused, never answered for every row', (op) => {
+    const where = { name: { [op]: 'acme' } } as Record<string, unknown>;
+    expect(refusalFor(where)).toMatchObject({ code: 'INVALID_FILTER', status: 400 });
+    expect(namesAnswered(where)).toEqual([]);
+  });
+});
+
+// ── direction 2 — the ten arms are untouched ────────────────────────────────
+
+describe('[#19810] the operators the draft preview DOES evaluate are unchanged', () => {
+  const ROW = { name: 'Acme Corp', amount: 800, spent_on: '2026-05-12' };
+
+  // [matches, does not match] for each arm — both directions, because a
+  // fail-closed default that starts REJECTING correct matches is the
+  // mirror-image defect of the one this card fixes.
+  const MATRIX: Array<[string, Record<string, unknown>, Record<string, unknown>]> = [
+    ['$eq', { amount: { $eq: 800 } }, { amount: { $eq: 1200 } }],
+    ['$ne', { amount: { $ne: 1200 } }, { amount: { $ne: 800 } }],
+    ['$gt', { amount: { $gt: 700 } }, { amount: { $gt: 800 } }],
+    ['$gte', { amount: { $gte: 800 } }, { amount: { $gte: 801 } }],
+    ['$lt', { amount: { $lt: 900 } }, { amount: { $lt: 800 } }],
+    ['$lte', { amount: { $lte: 800 } }, { amount: { $lte: 799 } }],
+    ['$lte (bare-day, #3777)', { spent_on: { $lte: '2026-05-12' } }, { spent_on: { $lte: '2026-05-11' } }],
+    ['$between', { amount: { $between: [700, 900] } }, { amount: { $between: [900, 1000] } }],
+    ['$in', { name: { $in: ['Acme Corp', 'Globex'] } }, { name: { $in: ['Globex'] } }],
+    ['$nin', { name: { $nin: ['Globex'] } }, { name: { $nin: ['Acme Corp'] } }],
+    ['$contains', { name: { $contains: 'cme' } }, { name: { $contains: 'zzz' } }],
+    ['implicit equality', { name: 'Acme Corp' }, { name: 'Globex' }],
+    ['$and', { $and: [{ amount: { $gt: 700 } }] }, { $and: [{ amount: { $gt: 900 } }] }],
+    ['$or', { $or: [{ amount: { $gt: 900 } }, { name: { $contains: 'cme' } }] }, { $or: [{ amount: { $gt: 900 } }] }],
+    ['$not', { $not: { amount: { $eq: 1200 } } }, { $not: { amount: { $eq: 800 } } }],
+  ];
+
+  it.each(MATRIX)('%s still answers both directions', (_label, hit, miss) => {
+    expect(matchesWhere(ROW, hit)).toBe(true);
+    expect(matchesWhere(ROW, miss)).toBe(false);
+  });
+
+  it('an absent `where` still matches every row', () => {
+    expect(matchesWhere(ROW, undefined)).toBe(true);
+    expect(namesAnswered({})).toEqual(expect.arrayContaining(['Acme Corp', 'Globex']));
+  });
+});
+
+// ── the refusal reaches the request path ────────────────────────────────────
+
+describe('[#19810] the refusal propagates through queryDataset({ previewDrafts })', () => {
+  it('refuses the drafted selection instead of charting every seed row', async () => {
+    const service = new AnalyticsService({ draftRowsResolver: vi.fn(async () => ROWS) });
+    await expect(
+      service.queryDataset(
+        DATASET,
+        { dimensions: ['name'], measures: ['count'], runtimeFilter: { name: { $icontains: 'acme' } } },
+        undefined,
+        { previewDrafts: true },
+      ),
+    ).rejects.toMatchObject({ code: 'INVALID_FILTER', status: 400 });
+  });
+});