From 660419059054eb03eb3866b41918c549e7112d7b Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 19:31:11 +0000
Subject: [PATCH 1/7] feat(dag-viewer): list the enumerated candidate DAGs and
 draw any of them

An Enumerated DAGs panel reads memo.enumeration: per-step counts, one row
per listed choice with the groups whose candidate differs from the
selected choice, the budget-share marker, cost and validity when priced
(cheaper than selected in red). Clicking a row draws the choice's composed
DAG in the Stage 1 lane. Documents without memo are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 .github/workflows/rust.yml                    |   2 +-
 tools/dag-viewer/README.md                    |  27 ++-
 tools/dag-viewer/app.js                       |  16 +-
 tools/dag-viewer/enumeration.js               | 194 ++++++++++++++++++
 tools/dag-viewer/enumeration.test.mjs         | 110 ++++++++++
 tools/dag-viewer/index.html                   |   9 +
 .../test-fixtures/memo-enumeration-small.json |   1 +
 tools/dag-viewer/test_viewer.py               |  42 +++-
 8 files changed, 394 insertions(+), 7 deletions(-)
 create mode 100644 tools/dag-viewer/enumeration.js
 create mode 100644 tools/dag-viewer/enumeration.test.mjs
 create mode 100644 tools/dag-viewer/test-fixtures/memo-enumeration-small.json

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 8890f03eb..745033239 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -130,7 +130,7 @@ jobs:
         python3 -m unittest -v test_viewer test_server
 
     - name: Run the DAG viewer's Node tests
-      run: node --test tools/dag-viewer/stages.test.mjs
+      run: node --test tools/dag-viewer/stages.test.mjs tools/dag-viewer/enumeration.test.mjs
 
     # A PromQL-only runtime builds asap-planner without DataFusion or MetricsQL.
     - name: Check and test asap-planner with the PromQL frontend alone
diff --git a/tools/dag-viewer/README.md b/tools/dag-viewer/README.md
index c6fb938ef..17250043f 100644
--- a/tools/dag-viewer/README.md
+++ b/tools/dag-viewer/README.md
@@ -76,6 +76,21 @@ To run it, see [RUNNING.md](RUNNING.md).
   for the newest), a `TimeRange` of one pane and the pane's build with its
   window (`window t−40 s … t−20 s`), and clicking a pane folds them back.
   This is display only: the document keeps the chain.
+- **Enumerated DAGs**, between the Stage 0 and Stage 1 lanes, shown only
+  when the document has `memo.enumeration`: the complete candidate DAGs the
+  memo stands for. The header counts them after each memo step (`Pass 1:
+  343 · Pass 2: ≥ 1000`; `≥` and the limit when counting stopped), says how
+  many of the enumerated step's DAGs the document lists, and, when they were
+  priced, how many are cheaper than the selected plan. Each row names the
+  groups whose candidate differs from the selected plan's choice
+  (`G7 → #2 CountSketch+heap (pass1)`: group, candidate index, its label and
+  origin when the step's memo lists the candidate), `budget share < 1` when
+  a chosen candidate shares its budget, and, when priced, its cost and
+  validity (`✗ invalid` with the cause). A row cheaper than the selected
+  plan is red; the selected choice says `✓ selected`. Clicking a row draws
+  its DAG in the Stage 1 lane; the document holds every listed choice's
+  composed DAG, so the page composes nothing. Such a DAG has no Stage 2
+  plan, so the Stage 2 lane is cleared.
 - **Highlighting**: the **highlight query** menu dims, in every lane, what
   that query's root does not reach. Clicking a node dims everything but
   what it reads and what reads it, directly or through other nodes; clicking
@@ -340,8 +355,10 @@ are ignored, `stage_pipeline`'s default.
 The viewer checks the document before showing it: one root per query, node,
 edge and root references, `scalar_roots` positions, `from_logical`, the Stage 3 ids, costs and
 `per_node` keys, the data workload's shape, and each materialized view's fields
-and `stage2_node_id`. Documents written before these sections are still
-shown. If a check fails, it shows the problems instead.
+and `stage2_node_id`, and, when present, `memo.enumeration`: per-step
+counts, the listed choices' ids, group → candidate maps, DAGs (one root per
+root group) and the optional pricing fields. Documents written before these
+sections are still shown. If a check fails, it shows the problems instead.
 
 ## Files
 
@@ -349,6 +366,10 @@ shown. If a check fails, it shows the problems instead.
 - `stages.js`: document checks, the candidate list, lane elements and node
   labels, pane-chain expansion, the queries reaching each node and the
   highlighted neighborhoods; no DOM. `stages.test.mjs`: its Node tests.
+- `enumeration.js`: the Enumerated DAGs panel and the checks of
+  `memo.enumeration`. `enumeration.test.mjs`: its Node tests, over
+  `test-fixtures/memo-enumeration-small.json` (a hand-written priced memo
+  for Example 1).
 - `node-style.js`: the operator-kind table (`KIND_CATEGORY_JSON`, checked
   against the IR by `crates/devtools/tests/viewer_contract.rs`) and the
   node groups.
@@ -399,7 +420,7 @@ python3 -m unittest test_viewer test_server
 cytoscape (headless), from the repository root:
 
 ```bash
-node --test tools/dag-viewer/stages.test.mjs
+node --test tools/dag-viewer/stages.test.mjs tools/dag-viewer/enumeration.test.mjs
 ```
 
 The JavaScript runs in V8 through `py_mini_racer` (`pip install
diff --git a/tools/dag-viewer/app.js b/tools/dag-viewer/app.js
index 076b3cf8e..8d661f312 100644
--- a/tools/dag-viewer/app.js
+++ b/tools/dag-viewer/app.js
@@ -164,6 +164,7 @@
   }
 
   function renderRanking() {
+    pressEnumeratedRow(null);
     const pressed = current.physical ? `P:${current.physical}` : `L:${current.logical}`;
     $('rank').innerHTML = rows.map((r) => `<li><button type="button" data-key="${esc(rowKey(r))}" aria-pressed="${rowKey(r) === pressed}"${r.status === 'not kept' ? ' disabled title="the default search did not keep this candidate"' : ''}>
         <span class="pid">${esc(r.id)}</span><span class="plabel">${esc(r.display_name || r.id)}</span>
@@ -205,6 +206,18 @@
     }
   }
 
+  // Draw enumerated DAG `id` of `memo.enumeration` (enumeration.js) in
+  // lane 1; the document has no physical plan for it.
+  function showEnumerated(id, dag, description) {
+    current = { logical: null, physical: null };
+    $('pick1').value = '';
+    $('pick2').value = '';
+    render(1, dag, false, null);
+    $('lane1-meta').innerHTML = `enumerated DAG <b>${esc(id)}</b> · ${esc(description)} · ${dag.nodes.length} nodes`;
+    clearLane(2, 'no physical plan for an enumerated DAG');
+    renderRanking();
+  }
+
   function selectPhysical(id) {
     current.physical = id;
     $('pick2').value = id;
@@ -230,7 +243,7 @@
 
   // Show one stage document; `source` names it, `story` explains it.
   function showDocument(data, source, story) {
-    const errors = validateStagePipeline(data);
+    const errors = validateStagePipeline(data).concat(validateMemoEnumeration(data));
     if (errors.length) throw new Error(errors.slice(0, 3).join('; '));
     doc = data;
     current = { logical: null, physical: null };
@@ -284,6 +297,7 @@
     }
     renderMaterializedViews();
     renderMemoSearch();
+    renderEnumeration(doc, showEnumerated);
   }
 
   const table = (head, body) => `<table><thead><tr>${head.map((h) => `<th>${esc(h)}</th>`).join('')}</tr></thead><tbody>${body}</tbody></table>`;
diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
new file mode 100644
index 000000000..86a45a858
--- /dev/null
+++ b/tools/dag-viewer/enumeration.js
@@ -0,0 +1,194 @@
+// The Enumerated DAGs panel: `memo.enumeration` of an asap-stage-pipeline/v1
+// document, the complete candidate DAGs the memo stands for, as `stage_pipeline`
+// enumerated and composed them. The document holds each listed choice's DAG,
+// so the page composes nothing: a clicked row's `dag` is drawn in the Stage 1
+// lane by app.js. The checks and the rows are DOM-free (enumeration.test.mjs);
+// renderEnumeration fills the panel. Reads validateLogicalDag and uniqueIds
+// from stages.js.
+
+// Memo steps in pipeline order, with the names the header uses.
+const MEMO_STEP_NAMES = { stage0: 'Stage 0', pass1: 'Pass 1', pass2: 'Pass 2', concrete_states: 'concrete states' };
+
+function memoStepName(step) {
+  return MEMO_STEP_NAMES[step] || step;
+}
+
+const enumerationIsObject = (value) => !!value && typeof value === 'object' && !Array.isArray(value);
+const enumerationIsCount = (value) => Number.isInteger(value) && value >= 0;
+
+// A `MemoChoice`: group id (a string of digits) → candidate index.
+function isMemoChoice(choice) {
+  return enumerationIsObject(choice) && Object.entries(choice).every(([group, index]) => /^\d+$/.test(group) && enumerationIsCount(index));
+}
+
+// Every shape problem of `memo.enumeration`, as readable strings; empty when
+// the document has none (a document without `memo` has none).
+function validateMemoEnumeration(doc) {
+  const memo = doc && doc.memo;
+  if (memo === undefined) return [];
+  if (!enumerationIsObject(memo)) return ['memo must be an object'];
+  const enumeration = memo.enumeration;
+  if (enumeration === undefined) return [];
+  const at = 'memo.enumeration';
+  if (!enumerationIsObject(enumeration)) return [`${at} must be an object`];
+  const errors = [];
+  const perStep = enumeration.per_step;
+  if (!enumerationIsObject(perStep)) errors.push(`${at}.per_step must be an object`);
+  else {
+    Object.entries(perStep).forEach(([step, entry]) => {
+      if (!entry || !enumerationIsCount(entry.count) || typeof entry.complete !== 'boolean') errors.push(`${at}.per_step.${step} needs a count and complete`);
+    });
+  }
+  if (typeof enumeration.step !== 'string' || !enumerationIsObject(perStep) || !(enumeration.step in perStep)) {
+    errors.push(`${at}.step must name a step of per_step`);
+  }
+  if (!Number.isInteger(enumeration.limit) || enumeration.limit < 1) errors.push(`${at}.limit must be a positive integer`);
+  const priced = enumeration.priced;
+  if (priced !== undefined && priced !== null && !(enumerationIsObject(priced) && enumerationIsCount(priced.count) && enumerationIsCount(priced.cheaper_than_selected)
+      && (priced.selected_cost_per_second === null || Number.isFinite(priced.selected_cost_per_second)))) {
+    errors.push(`${at}.priced must be null or {count, cheaper_than_selected, selected_cost_per_second}`);
+  }
+  if (!Array.isArray(enumeration.choices)) return errors.concat(`${at}.choices must be an array`);
+  uniqueIds(enumeration.choices, `${at}.choices`, errors);
+  const counted = enumerationIsObject(perStep) && perStep[enumeration.step];
+  if (counted && enumerationIsCount(counted.count) && enumeration.choices.length > counted.count) {
+    errors.push(`${at}: ${enumeration.choices.length} choices listed but per_step.${enumeration.step} counts ${counted.count}`);
+  }
+  enumeration.choices.forEach((entry, index) => {
+    if (!enumerationIsObject(entry)) return;
+    const where = `${at}.choices[${index}]`;
+    if (!isMemoChoice(entry.choice)) errors.push(`${where}.choice must map group ids to candidate indices`);
+    // One root per root group, which need not be one per query.
+    const roots = entry.dag && Array.isArray(entry.dag.roots) ? entry.dag.roots.length : 0;
+    errors.push(...validateLogicalDag(entry.dag, where, roots));
+    ['budget_share_1', 'selected'].forEach((field) => {
+      if (typeof entry[field] !== 'boolean') errors.push(`${where}.${field} must be true or false`);
+    });
+    // Present only when the run priced the enumerated DAGs.
+    ['valid', 'cheaper_than_selected'].forEach((field) => {
+      if (entry[field] !== undefined && typeof entry[field] !== 'boolean') errors.push(`${where}.${field} must be true or false`);
+    });
+    if (entry.rejection !== undefined && entry.rejection !== null && typeof entry.rejection !== 'string') errors.push(`${where}.rejection must be a string or null`);
+    if (entry.cost_per_second !== undefined && entry.cost_per_second !== null && !Number.isFinite(entry.cost_per_second)) {
+      errors.push(`${where}.cost_per_second must be a number or null`);
+    }
+  });
+  return errors;
+}
+
+// "343", or "≥ 1000" when the count stopped at the limit.
+function enumerationCountText(entry, limit) {
+  return entry.complete ? String(entry.count) : `≥ ${limit}`;
+}
+
+// The panel's content, or null for a document without `memo.enumeration`:
+// `counts` ("Stage 0: 1 · Pass 1: 343 · Pass 2: ≥ 1000"), `listing` (what the
+// rows are), `priced` (the pricing summary, "" when not priced), and one row
+// per listed choice. A row's `changes` are the groups whose candidate differs
+// from `selected_choice` (every group of the choice when there is none), each
+// with the candidate's origin and label when the enumerated step's memo
+// lists that candidate.
+function enumerationView(doc) {
+  const memo = doc && doc.memo;
+  const enumeration = memo && memo.enumeration;
+  if (!enumeration) return null;
+  const known = Object.keys(MEMO_STEP_NAMES);
+  const steps = Object.keys(enumeration.per_step)
+    .sort((a, b) => (known.indexOf(a) + 1 || known.length + 1) - (known.indexOf(b) + 1 || known.length + 1));
+  const counts = steps.map((step) => `${memoStepName(step)}: ${enumerationCountText(enumeration.per_step[step], enumeration.limit)}`).join(' · ');
+  const total = enumeration.per_step[enumeration.step];
+  const name = memoStepName(enumeration.step);
+  const shown = enumeration.choices.length;
+  const listing = total.complete && shown === total.count
+    ? `${name}: all ${shown} DAGs listed`
+    : `${name}: first ${shown} of ${enumerationCountText(total, enumeration.limit)} DAGs listed`;
+  const priced = enumeration.priced
+    ? `${enumeration.priced.count} priced · ${enumeration.priced.cheaper_than_selected} cheaper than the selected plan` +
+      (enumeration.priced.selected_cost_per_second === null ? '' : ` (${Number(enumeration.priced.selected_cost_per_second.toPrecision(4))})`)
+    : '';
+
+  const selected = enumerationIsObject(memo.selected_choice) ? memo.selected_choice : null;
+  const step = (Array.isArray(memo.steps) ? memo.steps : []).find((s) => s && s.step === enumeration.step);
+  const candidateOf = (group, index) => {
+    const g = step && Array.isArray(step.groups) ? step.groups.find((x) => x && String(x.id) === group) : null;
+    return g && Array.isArray(g.candidates) ? g.candidates.find((c) => c && c.index === index) : null;
+  };
+  const rows = enumeration.choices.map((entry) => {
+    const changes = Object.entries(entry.choice)
+      .filter(([group, index]) => !selected || selected[group] !== index)
+      .sort(([a], [b]) => Number(a) - Number(b))
+      .map(([group, index]) => {
+        const candidate = candidateOf(group, index);
+        return { group: Number(group), index, origin: candidate ? candidate.origin : null, label: candidate ? candidate.label : null };
+      });
+    return {
+      id: entry.id,
+      changes,
+      text: changes.length
+        ? changes.map((c) => `G${c.group} → #${c.index}${c.label ? ` ${c.label}` : ''}${c.origin ? ` (${c.origin})` : ''}`).join(' · ')
+        : 'the selected choice',
+      nodes: entry.dag.nodes.length,
+      budgetShare1: entry.budget_share_1,
+      selected: entry.selected,
+      priced: 'valid' in entry,
+      valid: entry.valid,
+      rejection: entry.rejection || null,
+      cost: typeof entry.cost_per_second === 'number' ? entry.cost_per_second : null,
+      cheaper: entry.cheaper_than_selected === true,
+    };
+  });
+  const against = selected ? 'groups whose candidate differs from the selected plan’s choice'
+    : `every group's candidate (no selected choice${memo.selected_choice_unavailable ? `: ${memo.selected_choice_unavailable}` : ''})`;
+  return { counts, listing, priced, against, rows };
+}
+
+// The panel's state: the document's view, the row drawn in the Stage 1
+// lane, and app.js's function that draws an enumerated DAG there.
+const enumerationPanel = { doc: null, view: null, pressed: null, draw: null, bound: false };
+
+function enumerationRowHtml(row, pressed) {
+  const esc = (s) => String(s).replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));
+  const chips = [
+    row.selected ? '<span class="chip selected">✓ selected</span>' : '',
+    row.cheaper ? '<span class="chip invalid">cheaper than selected</span>' : '',
+    row.priced && row.valid === false ? '<span class="chip invalid">✗ invalid</span>' : '',
+    row.priced && row.valid === true && !row.selected && !row.cheaper ? '<span class="chip costlier">valid</span>' : '',
+    row.budgetShare1 ? '' : '<span class="chip">budget share &lt; 1</span>',
+  ].join('');
+  const cost = row.cost === null ? (row.priced ? '—' : '') : String(Number(row.cost.toPrecision(4)));
+  return `<li><button type="button" data-id="${esc(row.id)}" aria-pressed="${row.id === pressed}"${row.cheaper ? ' class="cheaper"' : ''}>` +
+    `<span class="pid">${esc(row.id)}</span><span class="plabel">${esc(row.text)}</span><span class="ptotal">${cost}</span>` +
+    `<span class="pstatus">${chips}${row.rejection ? `<span>${esc(row.rejection.replace(/_/g, ' '))}</span>` : ''}<span>${row.nodes} nodes</span></span></button></li>`;
+}
+
+// Mark row `id` (null: none) as the one the Stage 1 lane draws.
+function pressEnumeratedRow(id) {
+  const state = enumerationPanel;
+  state.pressed = id;
+  if (state.view) document.getElementById('enumRows').innerHTML = state.view.rows.map((row) => enumerationRowHtml(row, id)).join('');
+}
+
+// Fill the panel for `doc` (hidden without `memo.enumeration`); a click on a
+// row calls `draw(id, dag, description)` and marks the row.
+function renderEnumeration(doc, draw) {
+  const $ = (id) => document.getElementById(id);
+  const state = enumerationPanel;
+  state.doc = doc;
+  state.view = enumerationView(doc);
+  state.draw = draw;
+  $('enumPanel').hidden = !state.view;
+  if (!state.view) { state.pressed = null; $('enumRows').innerHTML = ''; return; }
+  $('enum-meta').textContent = [state.view.counts, state.view.listing, state.view.priced, `each row: ${state.view.against}`].filter(Boolean).join(' · ');
+  pressEnumeratedRow(null);
+  if (state.bound) return;
+  state.bound = true;
+  // One listener for every document: rows are rewritten on each load.
+  $('enumRows').addEventListener('click', (event) => {
+    const button = event.target && event.target.closest ? event.target.closest('button[data-id]') : null;
+    if (!button || !state.view) return;
+    const choice = state.doc.memo.enumeration.choices.find((c) => c.id === button.dataset.id);
+    const row = state.view.rows.find((r) => r.id === button.dataset.id);
+    state.draw(choice.id, choice.dag, row.text);
+    pressEnumeratedRow(choice.id);
+  });
+}
diff --git a/tools/dag-viewer/enumeration.test.mjs b/tools/dag-viewer/enumeration.test.mjs
new file mode 100644
index 000000000..4ca74f1c0
--- /dev/null
+++ b/tools/dag-viewer/enumeration.test.mjs
@@ -0,0 +1,110 @@
+// Node tests of enumeration.js (no DOM): the checks of `memo.enumeration` and
+// the Enumerated DAGs panel's rows, over a hand-written priced memo on #509
+// Example 1 (test-fixtures/memo-enumeration-small.json). Run from the
+// repository root: `node --test tools/dag-viewer/enumeration.test.mjs`.
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import vm from 'node:vm';
+
+const here = new URL('.', import.meta.url);
+const context = vm.createContext({ console: { warn() {} } });
+for (const file of ['node-style.js', 'stages.js', 'enumeration.js']) {
+  vm.runInContext(readFileSync(new URL(file, here), 'utf8'), context, { filename: file });
+}
+const call = (name, ...args) => JSON.parse(JSON.stringify(context[name](...args)));
+const read = (path) => JSON.parse(readFileSync(new URL(path, here), 'utf8'));
+const example1 = read('examples/planner-layering-example1.json');
+const priced = () => ({ ...structuredClone(example1), ...read('test-fixtures/memo-enumeration-small.json') });
+// The same memo as a run without --price-enumerated writes it.
+const unpriced = () => {
+  const doc = priced();
+  doc.memo.enumeration.priced = null;
+  doc.memo.enumeration.choices.forEach((c) => { delete c.valid; delete c.rejection; delete c.cost_per_second; delete c.cheaper_than_selected; });
+  return doc;
+};
+
+test('documents without memo, or memo without enumeration, have no enumeration problems', () => {
+  assert.deepEqual(call('validateMemoEnumeration', example1), []);
+  assert.deepEqual(call('validateMemoEnumeration', { ...example1, memo: { steps: [] } }), []);
+  assert.equal(call('enumerationView', example1), null);
+});
+
+test('the priced and unpriced fixtures are valid', () => {
+  assert.deepEqual(call('validateMemoEnumeration', priced()), []);
+  assert.deepEqual(call('validateMemoEnumeration', unpriced()), []);
+});
+
+test('each broken field of memo.enumeration is reported', () => {
+  const cases = {
+    'memo must be an object': (d) => { d.memo = []; },
+    'per_step.pass1 needs a count and complete': (d) => { d.memo.enumeration.per_step.pass1.complete = 'yes'; },
+    'step must name a step of per_step': (d) => { d.memo.enumeration.step = 'pass9'; },
+    'limit must be a positive integer': (d) => { d.memo.enumeration.limit = 0; },
+    'choices must be an array': (d) => { d.memo.enumeration.choices = {}; },
+    'duplicate id E1': (d) => { d.memo.enumeration.choices[1].id = 'E1'; },
+    '5 choices listed but per_step.pass1 counts 4': (d) => { d.memo.enumeration.choices.push({ ...d.memo.enumeration.choices[0], id: 'E5' }); },
+    'choices[0].choice must map group ids to candidate indices': (d) => { d.memo.enumeration.choices[0].choice = { G7: 0 }; },
+    'choices[0]: node 1 reads missing node 42': (d) => { Object.values(d.memo.enumeration.choices[0].dag.nodes[1].operator)[0].TimeRange.child = 42; },
+    'choices[0]: dag needs nodes and roots': (d) => { delete d.memo.enumeration.choices[0].dag; },
+    'choices[0].budget_share_1 must be true or false': (d) => { delete d.memo.enumeration.choices[0].budget_share_1; },
+    'choices[0].cheaper_than_selected must be true or false': (d) => { d.memo.enumeration.choices[0].cheaper_than_selected = 1; },
+    'choices[0].cost_per_second must be a number or null': (d) => { d.memo.enumeration.choices[0].cost_per_second = 'cheap'; },
+    'choices[0].rejection must be a string or null': (d) => { d.memo.enumeration.choices[0].rejection = 3; },
+    'priced must be null or': (d) => { d.memo.enumeration.priced = { count: 4 }; },
+  };
+  for (const [message, breakIt] of Object.entries(cases)) {
+    const doc = priced();
+    breakIt(doc);
+    const errors = call('validateMemoEnumeration', doc);
+    assert.ok(errors.some((e) => e.includes(message)), `${message}: got ${JSON.stringify(errors)}`);
+  }
+});
+
+test('the header counts every step, with ≥ and the limit when the count stopped', () => {
+  const view = call('enumerationView', unpriced());
+  assert.equal(view.counts, 'Stage 0: 1 · Pass 1: 4 · Pass 2: ≥ 1000');
+  assert.equal(view.listing, 'Pass 1: all 4 DAGs listed');
+  assert.equal(view.priced, '');
+  const capped = unpriced();
+  capped.memo.enumeration.per_step.pass1 = { count: 1000, complete: false };
+  assert.equal(call('enumerationView', capped).listing, 'Pass 1: first 4 of ≥ 1000 DAGs listed');
+});
+
+test('a row names the groups whose candidate differs from the selected choice, with origin and label', () => {
+  const rows = call('enumerationView', unpriced()).rows;
+  assert.deepEqual(rows.map((r) => r.id), ['E1', 'E2', 'E3', 'E4']);
+  assert.equal(rows[0].text, 'G7 → #0 exact accumulator (pass1)');
+  assert.equal(rows[1].text, 'the selected choice');
+  assert.equal(rows[1].selected, true);
+  assert.equal(rows[3].text, 'G7 → #3 CMS+heap shared build (shared_build)');
+  assert.equal(rows[3].budgetShare1, false);
+  assert.ok(rows.every((r) => !r.priced && r.cost === null && !r.cheaper));
+});
+
+test('without the step in memo.steps a row names only the candidate index', () => {
+  const doc = unpriced();
+  doc.memo.steps = [];
+  assert.equal(call('enumerationView', doc).rows[2].text, 'G7 → #2');
+});
+
+test('without a selected choice a row names every group of its choice', () => {
+  const doc = unpriced();
+  doc.memo.selected_choice = null;
+  doc.memo.selected_choice_unavailable = 'no plan selected';
+  const view = call('enumerationView', doc);
+  assert.equal(view.rows[0].changes.length, 8);
+  assert.match(view.against, /no plan selected/);
+});
+
+test('a priced row carries its cost, validity and whether it is cheaper than the selected plan', () => {
+  const view = call('enumerationView', priced());
+  assert.equal(view.priced, '4 priced · 1 cheaper than the selected plan (2)');
+  const byId = Object.fromEntries(view.rows.map((r) => [r.id, r]));
+  assert.deepEqual([byId.E3.cost, byId.E3.valid, byId.E3.cheaper], [1.5, true, true]);
+  assert.deepEqual([byId.E4.cost, byId.E4.valid, byId.E4.rejection], [null, false, 'accuracy_target_missed']);
+  const html = context.enumerationRowHtml(view.rows[2], null);
+  assert.match(html, /class="cheaper"/);
+  assert.match(html, /cheaper than selected/);
+  assert.doesNotMatch(context.enumerationRowHtml(view.rows[0], null), /cheaper/);
+});
diff --git a/tools/dag-viewer/index.html b/tools/dag-viewer/index.html
index 632630368..91fd27265 100644
--- a/tools/dag-viewer/index.html
+++ b/tools/dag-viewer/index.html
@@ -83,6 +83,9 @@
 .chip.selected { color: var(--ok); background: var(--ok-soft); }
 .chip.invalid { color: var(--bad); background: var(--bad-soft); }
 .chip.costlier { color: var(--warn); background: var(--warn-soft); }
+/* Enumerated DAGs: a row cheaper than the selected plan is red. */
+#enumRows { max-height: 360px; }
+.rank button.cheaper { border-color: var(--bad); background: var(--bad-soft); }
 /* Stage 0, 1 and 2 stack top to bottom, each as wide as the page allows. */
 .lanes { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; min-width: 0; }
 .lane .panel-head { align-items: center; }
@@ -217,6 +220,11 @@ <h1>ASAPPlanner Stage Viewer</h1>
           <div class="lane-meta" id="lane0-meta"></div>
           <div class="cy" id="cy0"></div>
         </section>
+        <section class="panel" id="enumPanel" aria-labelledby="enum-title" hidden>
+          <div class="panel-head"><div><div class="eyebrow">Memo · complete candidate DAGs</div><h2 id="enum-title">Enumerated DAGs</h2></div><span class="eyebrow">click a row to draw it in Stage 1</span></div>
+          <div class="lane-meta" id="enum-meta"></div>
+          <ol class="rank" id="enumRows"></ol>
+        </section>
         <section class="panel lane" aria-labelledby="lane1-title">
           <div class="panel-head"><div><div class="eyebrow">Stage 1</div><h2 id="lane1-title">Logical ASAP candidate</h2></div>
             <label><span class="eyebrow" style="display:block">candidate</span><select id="pick1" aria-label="Logical ASAP candidate"></select></label></div>
@@ -264,6 +272,7 @@ <h1>ASAPPlanner Stage Viewer</h1>
 <script src="cytoscape-dagre.js"></script>
 <script src="node-style.js"></script>
 <script src="stages.js"></script>
+<script src="enumeration.js"></script>
 <script src="app.js"></script>
 <script src="editor.js"></script>
 <script src="workload-sets.js"></script>
diff --git a/tools/dag-viewer/test-fixtures/memo-enumeration-small.json b/tools/dag-viewer/test-fixtures/memo-enumeration-small.json
new file mode 100644
index 000000000..c7204b64f
--- /dev/null
+++ b/tools/dag-viewer/test-fixtures/memo-enumeration-small.json
@@ -0,0 +1 @@
+{"memo":{"steps":[{"step":"stage0","title":"Stage 0","groups":[{"id":0,"label":"Scan 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inputs"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"NonASAP":{"TimeRange":{"child":0,"kind":"range","range":{"nanos":0,"secs":60}}}},"result_kind":"range_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"value","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":1,"family":{"ExactAggregate":["Rate","Rate"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":null,"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"unknown_or_signed"}},"reduction":"PerEntity"}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"ExactAggregate":["Rate","Rate"]},"name":"state","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":{"provenance":[{"kind":"exact","reason":"exact accumulator over exact input"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"ASAP":{"FinalizeExactAccumulator":{"child":2}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"value","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":3,"family":{"ExactAggregate":["Sum","Sum"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":null,"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"unknown_or_signed"}},"reduction":{"Reduce":[2]}}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"ExactAggregate":["Sum","Sum"]},"name":"state","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":{"provenance":[{"kind":"exact","reason":"exact accumulator over exact input"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"ASAP":{"FinalizeExactAccumulator":{"child":4}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"float64"},"name":"sum","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":1,"family":{"Sketch":[{"algorithm":"CmsWithHeap","category":"TopK","params":{"CmsWithHeap":{"depth":7,"heap_size":100,"width":272}}},"PerSubpopulationInstance"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":{"Column":{"Named":"$promql_series_identity"}},"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"samples_of_metric","metric":"http_requests_total"}},"reduction":{"Reduce":[2]}}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Sketch":[{"algorithm":"CmsWithHeap","category":"TopK","params":{"CmsWithHeap":{"depth":7,"heap_size":100,"width":272}}},"PerSubpopulationInstance"]},"name":"state","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryEstimate":{"query":{"TopK":{"k":10}},"summary_input":6}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"topk","nullable":false,"table":null}],"time_index":null,"unique_keys":[]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"NonASAP":{"Project":{"child":7,"cols":[{"alias":"job","expr":{"Column":0}},{"alias":"topk_10","expr":{"Column":2}},{"alias":"$promql_series_identity","expr":{"Column":1}}],"qualifier":null}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"float64"},"name":"topk_10","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":null,"unique_keys":[]},"timing":null}],"roots":[{"Operator":5},{"Operator":8}]},"budget_share_1":false,"selected":false,"valid":false,"rejection":"accuracy_target_missed","cost_per_second":null,"cheaper_than_selected":false}],"priced":{"count":4,"cheaper_than_selected":1,"selected_cost_per_second":2.0}}}}
diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index 5ef731d63..bcaf3303e 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -28,6 +28,9 @@
 # workload-01 (nine repeating PromQL queries), planned with the default
 # search as the MVP deployment; its selected plan keeps panes at ingestion.
 SEED862 = HERE / "examples" / "random-mixed-seed-862-workload-01.json"
+# A hand-written priced `memo` section for Example 1: four enumerated
+# Pass 1 DAGs, E2 selected, E3 cheaper than it, E4 invalid.
+MEMO_ENUMERATION = HERE / "test-fixtures" / "memo-enumeration-small.json"
 WORKLOADS = HERE / "workloads"
 # Standalone scalar queries at positions 0, 2 and 4 (first, middle, last):
 # scalar(sum(m)), sum(n), time(), sum by (job) (k), 1 + 2.
@@ -762,7 +765,7 @@ def test_scripts_exist(self):
     def test_every_element_the_scripts_use_is_on_the_page(self):
         page = (HERE / "index.html").read_text()
         ids = set(re.findall(r'id="([^"]+)"', page))
-        for script in ("app.js", "editor.js"):
+        for script in ("app.js", "editor.js", "enumeration.js"):
             used = set(re.findall(r"\$\('([^']+)'\)", (HERE / script).read_text()))
             with self.subTest(script):
                 self.assertLessEqual(used, ids)
@@ -884,7 +887,7 @@ class AppTests(unittest.TestCase):
     def page(self, search="", files=None, hash_=""):
         js = py_mini_racer.MiniRacer()
         js.eval(STUB_DOM)
-        for name in ("node-style.js", "stages.js"):
+        for name in ("node-style.js", "stages.js", "enumeration.js"):
             js.eval((HERE / name).read_text())
         for url, text in (files or {}).items():
             js.eval(f"__files[{json.dumps(url)}] = {json.dumps(text)};")
@@ -1059,6 +1062,41 @@ def test_tapping_a_node_highlights_its_neighborhood_and_lists_its_queries(self):
         js.eval("__taps['cy2 background']({ target: { isNode: false } })")
         self.assertEqual(js.eval("__dimmed.cy2.length"), 0)
 
+    def test_a_document_without_memo_hides_the_enumerated_dags(self):
+        js = self.page("?doc=e1.json", {"e1.json": EXAMPLE1.read_text()})
+        self.assertTrue(js.eval("__els.enumPanel.hidden"))
+        self.assertEqual(js.eval("__els.enumRows.innerHTML"), "")
+
+    def test_clicking_an_enumerated_dag_draws_it_in_the_stage1_lane(self):
+        """The panel lists the enumerated choices; a click draws the
+        choice's composed DAG in lane 1 and clears lane 2."""
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        js = self.page("?doc=d.json", {"d.json": json.dumps(doc)})
+        self.assertFalse(js.eval("__els.enumPanel.hidden"))
+        meta = js.eval("__els['enum-meta'].textContent")
+        self.assertIn("Pass 1: 4", meta)
+        self.assertIn("Pass 2: ≥ 1000", meta)
+        self.assertIn("1 cheaper than the selected plan", meta)
+        rows = js.eval("__els.enumRows.innerHTML")
+        self.assertEqual(rows.count("<li>"), 4)
+        self.assertIn('data-id="E3" aria-pressed="false" class="cheaper"', rows)
+        e3 = doc["memo"]["enumeration"]["choices"][2]
+        js.eval("__els.enumRows.__on.click({ target: { closest() { return { dataset: { id: 'E3' } }; } } })")
+        drawn = [e for e in self.ev(js, "__rendered.cy1") if "source" not in e["data"]]
+        self.assertEqual(len(drawn), len(e3["dag"]["nodes"]))
+        self.assertIn("enumerated DAG E3", self.text(js, "lane1-meta"))
+        self.assertIn("no physical plan for an enumerated DAG", js.eval("__els['lane2-meta'].textContent"))
+        self.assertIn('data-id="E3" aria-pressed="true"', js.eval("__els.enumRows.innerHTML"))
+        # Choosing a Stage 1 candidate again releases the row.
+        js.eval("__els.pick1.__on.change({ target: { value: 'L2' } })")
+        self.assertNotIn('aria-pressed="true"', js.eval("__els.enumRows.innerHTML"))
+
+    def test_a_broken_enumeration_refuses_the_document(self):
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        doc["memo"]["enumeration"]["limit"] = 0
+        js = self.page("?doc=d.json", {"d.json": json.dumps(doc)})
+        self.assertIn("limit must be a positive integer", js.eval("__els.queries.innerHTML"))
+
     def test_an_invalid_document_shows_an_error(self):
         js = self.page("?doc=bad.json", {"bad.json": json.dumps({"format": "nope"})})
         self.assertIn("Could not load", js.eval("__els.queries.innerHTML"))

From 561e4704073419e68f13abd42ba49e212c5181a7 Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 19:36:08 +0000
Subject: [PATCH 2/7] fix(dag-viewer): compare sparse choices, flag cross-step
 comparisons, root groups

Review fixes: a group a choice does not name takes candidate 0; a selected
choice over a later step is flagged and only the row's groups are compared;
an enumerated DAG with fewer root groups than queries labels its roots as
root groups; the cheaper chip has its own style; the enumerated row is
released by selectLogical/selectPhysical.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/README.md                    |  8 +++-
 tools/dag-viewer/app.js                       | 19 +++++----
 tools/dag-viewer/enumeration.js               | 36 +++++++++++------
 tools/dag-viewer/enumeration.test.mjs         | 39 +++++++++++++++++--
 tools/dag-viewer/index.html                   |  1 +
 .../test-fixtures/memo-enumeration-small.json |  2 +-
 tools/dag-viewer/test_viewer.py               | 13 ++++++-
 7 files changed, 93 insertions(+), 25 deletions(-)

diff --git a/tools/dag-viewer/README.md b/tools/dag-viewer/README.md
index 17250043f..888a9f357 100644
--- a/tools/dag-viewer/README.md
+++ b/tools/dag-viewer/README.md
@@ -84,13 +84,17 @@ To run it, see [RUNNING.md](RUNNING.md).
   priced, how many are cheaper than the selected plan. Each row names the
   groups whose candidate differs from the selected plan's choice
   (`G7 → #2 CountSketch+heap (pass1)`: group, candidate index, its label and
-  origin when the step's memo lists the candidate), `budget share < 1` when
+  origin when the step's memo lists the candidate; a group a choice does not
+  name takes candidate 0). The selected choice is over the last memo step;
+  when an earlier step was enumerated, the header says so and only each
+  row's own groups are compared. A row also shows `budget share < 1` when
   a chosen candidate shares its budget, and, when priced, its cost and
   validity (`✗ invalid` with the cause). A row cheaper than the selected
   plan is red; the selected choice says `✓ selected`. Clicking a row draws
   its DAG in the Stage 1 lane; the document holds every listed choice's
   composed DAG, so the page composes nothing. Such a DAG has no Stage 2
-  plan, so the Stage 2 lane is cleared.
+  plan, so the Stage 2 lane is cleared. Its roots are its root groups; when
+  there are fewer than queries, the lane labels them `root group #n`.
 - **Highlighting**: the **highlight query** menu dims, in every lane, what
   that query's root does not reach. Clicking a node dims everything but
   what it reads and what reads it, directly or through other nodes; clicking
diff --git a/tools/dag-viewer/app.js b/tools/dag-viewer/app.js
index 8d661f312..345501f3f 100644
--- a/tools/dag-viewer/app.js
+++ b/tools/dag-viewer/app.js
@@ -53,10 +53,11 @@
   // The query whose path the lanes highlight ('' for none).
   let highlightedQuery = '';
 
-  function render(i, dag, physical, costPerNode) {
+  // `ids` names the queries of `dag.roots` in order (default: the workload's).
+  function render(i, dag, physical, costPerNode, ids = queryIds) {
     if (cys[i]) cys[i].destroy();
-    drawn[i] = { dag, physical, costPerNode };
-    const elements = stageLaneElements(dag, { physical, costPerNode, queryIds, expandedChains: [...expandedOf(dag)] })
+    drawn[i] = { dag, physical, costPerNode, ids };
+    const elements = stageLaneElements(dag, { physical, costPerNode, queryIds: ids, expandedChains: [...expandedOf(dag)] })
       .map((el) => ({ data: el.data, classes: [el.classes, el.data.rootFor && el.data.rootFor.length ? 'root' : ''].join(' ').trim() }));
     laneElements[i] = elements;
     const cy = cytoscape({
@@ -72,7 +73,7 @@
     dim(i, queryKeep(i));
   }
 
-  function redraw(i) { const d = drawn[i]; render(i, d.dag, d.physical, d.costPerNode); }
+  function redraw(i) { const d = drawn[i]; render(i, d.dag, d.physical, d.costPerNode, d.ids); }
 
   // A PaneChain expands into its panes; a pane collapses its chain; any
   // other node is shown and its upstream and downstream highlighted.
@@ -164,7 +165,6 @@
   }
 
   function renderRanking() {
-    pressEnumeratedRow(null);
     const pressed = current.physical ? `P:${current.physical}` : `L:${current.logical}`;
     $('rank').innerHTML = rows.map((r) => `<li><button type="button" data-key="${esc(rowKey(r))}" aria-pressed="${rowKey(r) === pressed}"${r.status === 'not kept' ? ' disabled title="the default search did not keep this candidate"' : ''}>
         <span class="pid">${esc(r.id)}</span><span class="plabel">${esc(r.display_name || r.id)}</span>
@@ -180,6 +180,7 @@
   // Choose Stage 1 candidate `id`: show its physical plan when it has one;
   // a pruned or uncomposed candidate has none, so Stage 2 is cleared.
   function selectLogical(id) {
+    pressEnumeratedRow(null);
     const physical = doc.stage2_physical_asap_optimization.candidates.find((p) => p.from_logical === id);
     if (physical) { selectPhysical(physical.id); return; }
     showLogical(id);
@@ -212,13 +213,17 @@
     current = { logical: null, physical: null };
     $('pick1').value = '';
     $('pick2').value = '';
-    render(1, dag, false, null);
-    $('lane1-meta').innerHTML = `enumerated DAG <b>${esc(id)}</b> · ${esc(description)} · ${dag.nodes.length} nodes`;
+    // Its roots are its root groups; they name queries only when there is one per query.
+    const perQuery = dag.roots.length === queryIds.length;
+    render(1, dag, false, null, perQuery ? queryIds : dag.roots.map((_, k) => `root group #${k + 1}`));
+    $('lane1-meta').innerHTML = `enumerated DAG <b>${esc(id)}</b> · ${esc(description)} · ${dag.nodes.length} nodes` +
+      (perQuery ? '' : ` · ${dag.roots.length} root groups for ${queryIds.length} queries: roots not matched to queries`);
     clearLane(2, 'no physical plan for an enumerated DAG');
     renderRanking();
   }
 
   function selectPhysical(id) {
+    pressEnumeratedRow(null);
     current.physical = id;
     $('pick2').value = id;
     const c = physicalById.get(id);
diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
index 86a45a858..7818195a8 100644
--- a/tools/dag-viewer/enumeration.js
+++ b/tools/dag-viewer/enumeration.js
@@ -87,7 +87,10 @@ function enumerationCountText(entry, limit) {
 // per listed choice. A row's `changes` are the groups whose candidate differs
 // from `selected_choice` (every group of the choice when there is none), each
 // with the candidate's origin and label when the enumerated step's memo
-// lists that candidate.
+// lists that candidate. Both choices are sparse: a group a choice does not
+// name takes candidate 0. `selected_choice` is over the last memo step; when
+// the enumerated step is an earlier one, only the row's own groups are
+// compared and `against` says the comparison crosses steps.
 function enumerationView(doc) {
   const memo = doc && doc.memo;
   const enumeration = memo && memo.enumeration;
@@ -100,8 +103,8 @@ function enumerationView(doc) {
   const name = memoStepName(enumeration.step);
   const shown = enumeration.choices.length;
   const listing = total.complete && shown === total.count
-    ? `${name}: all ${shown} DAGs listed`
-    : `${name}: first ${shown} of ${enumerationCountText(total, enumeration.limit)} DAGs listed`;
+    ? `listed: all ${shown} ${name} DAGs`
+    : `listed: the first ${shown} of ${enumerationCountText(total, enumeration.limit)} ${name} DAGs`;
   const priced = enumeration.priced
     ? `${enumeration.priced.count} priced · ${enumeration.priced.cheaper_than_selected} cheaper than the selected plan` +
       (enumeration.priced.selected_cost_per_second === null ? '' : ` (${Number(enumeration.priced.selected_cost_per_second.toPrecision(4))})`)
@@ -113,11 +116,19 @@ function enumerationView(doc) {
     const g = step && Array.isArray(step.groups) ? step.groups.find((x) => x && String(x.id) === group) : null;
     return g && Array.isArray(g.candidates) ? g.candidates.find((c) => c && c.index === index) : null;
   };
+  const memoSteps = Array.isArray(memo.steps) ? memo.steps.filter((s) => s && typeof s.step === 'string') : [];
+  const lastStep = memoSteps.length ? memoSteps[memoSteps.length - 1].step : steps[steps.length - 1];
+  const sameStep = enumeration.step === lastStep;
   const rows = enumeration.choices.map((entry) => {
-    const changes = Object.entries(entry.choice)
-      .filter(([group, index]) => !selected || selected[group] !== index)
-      .sort(([a], [b]) => Number(a) - Number(b))
-      .map(([group, index]) => {
+    const groups = new Set(Object.keys(entry.choice));
+    if (selected && sameStep) Object.keys(selected).forEach((group) => groups.add(group));
+    const changes = [...groups]
+      .filter((group) => !selected || (entry.choice[group] ?? 0) !== (selected[group] ?? 0))
+      .sort((a, b) => Number(a) - Number(b))
+      .map((group) => {
+        // A group of the selected choice this DAG does not read.
+        if (!(group in entry.choice)) return { group: Number(group), index: null, origin: null, label: null };
+        const index = entry.choice[group];
         const candidate = candidateOf(group, index);
         return { group: Number(group), index, origin: candidate ? candidate.origin : null, label: candidate ? candidate.label : null };
       });
@@ -125,7 +136,8 @@ function enumerationView(doc) {
       id: entry.id,
       changes,
       text: changes.length
-        ? changes.map((c) => `G${c.group} → #${c.index}${c.label ? ` ${c.label}` : ''}${c.origin ? ` (${c.origin})` : ''}`).join(' · ')
+        ? changes.map((c) => (c.index === null ? `G${c.group} not read`
+          : `G${c.group} → #${c.index}${c.label ? ` ${c.label}` : ''}${c.origin ? ` (${c.origin})` : ''}`)).join(' · ')
         : 'the selected choice',
       nodes: entry.dag.nodes.length,
       budgetShare1: entry.budget_share_1,
@@ -137,8 +149,10 @@ function enumerationView(doc) {
       cheaper: entry.cheaper_than_selected === true,
     };
   });
-  const against = selected ? 'groups whose candidate differs from the selected plan’s choice'
-    : `every group's candidate (no selected choice${memo.selected_choice_unavailable ? `: ${memo.selected_choice_unavailable}` : ''})`;
+  const against = !selected
+    ? `every group's candidate (no selected choice${memo.selected_choice_unavailable ? `: ${memo.selected_choice_unavailable}` : ''})`
+    : sameStep ? 'groups whose candidate differs from the selected plan’s choice'
+      : `groups whose candidate differs from the selected plan’s choice, which is over the ${memoStepName(lastStep)} memo: its group ids and candidate indices may not match ${name}'s, and “selected” is not meaningful`;
   return { counts, listing, priced, against, rows };
 }
 
@@ -150,7 +164,7 @@ function enumerationRowHtml(row, pressed) {
   const esc = (s) => String(s).replace(/[&<>"]/g, (c) => ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' }[c]));
   const chips = [
     row.selected ? '<span class="chip selected">✓ selected</span>' : '',
-    row.cheaper ? '<span class="chip invalid">cheaper than selected</span>' : '',
+    row.cheaper ? '<span class="chip cheaper">cheaper than selected</span>' : '',
     row.priced && row.valid === false ? '<span class="chip invalid">✗ invalid</span>' : '',
     row.priced && row.valid === true && !row.selected && !row.cheaper ? '<span class="chip costlier">valid</span>' : '',
     row.budgetShare1 ? '' : '<span class="chip">budget share &lt; 1</span>',
diff --git a/tools/dag-viewer/enumeration.test.mjs b/tools/dag-viewer/enumeration.test.mjs
index 4ca74f1c0..195c4b524 100644
--- a/tools/dag-viewer/enumeration.test.mjs
+++ b/tools/dag-viewer/enumeration.test.mjs
@@ -63,12 +63,45 @@ test('each broken field of memo.enumeration is reported', () => {
 
 test('the header counts every step, with ≥ and the limit when the count stopped', () => {
   const view = call('enumerationView', unpriced());
-  assert.equal(view.counts, 'Stage 0: 1 · Pass 1: 4 · Pass 2: ≥ 1000');
-  assert.equal(view.listing, 'Pass 1: all 4 DAGs listed');
+  assert.equal(view.counts, 'Stage 0: 1 · Pass 1: 4');
+  assert.equal(view.listing, 'listed: all 4 Pass 1 DAGs');
   assert.equal(view.priced, '');
   const capped = unpriced();
   capped.memo.enumeration.per_step.pass1 = { count: 1000, complete: false };
-  assert.equal(call('enumerationView', capped).listing, 'Pass 1: first 4 of ≥ 1000 DAGs listed');
+  capped.memo.enumeration.per_step.pass2 = { count: 1000, complete: false };
+  const cappedView = call('enumerationView', capped);
+  assert.equal(cappedView.counts, 'Stage 0: 1 · Pass 1: ≥ 1000 · Pass 2: ≥ 1000');
+  assert.equal(cappedView.listing, 'listed: the first 4 of ≥ 1000 Pass 1 DAGs');
+});
+
+test('choices are sparse: a group either choice leaves out takes candidate 0', () => {
+  const doc = unpriced();
+  doc.memo.selected_choice = { 7: 1 };
+  const choices = doc.memo.enumeration.choices;
+  choices[0].choice = { 3: 0, 7: 0 };
+  delete choices[1].choice[2];
+  choices[2].choice = { 7: 2, 2: 0 };
+  const rows = call('enumerationView', doc).rows;
+  assert.equal(rows[0].text, 'G7 → #0 exact accumulator (pass1)');
+  assert.equal(rows[1].text, 'the selected choice');
+  assert.equal(rows[2].text, 'G7 → #2 CountSketch+heap (pass1)');
+});
+
+test('a group of the selected choice that a DAG does not read is named', () => {
+  const doc = unpriced();
+  doc.memo.selected_choice = { 7: 1, 9: 2 };
+  assert.equal(call('enumerationView', doc).rows[1].text, 'G9 not read');
+});
+
+test('a selected choice over a later step than the enumerated one is flagged', () => {
+  const doc = unpriced();
+  doc.memo.steps.push({ step: 'pass2', title: 'Pass 2', groups: [] });
+  doc.memo.enumeration.per_step.pass2 = { count: 1000, complete: false };
+  doc.memo.selected_choice = { 7: 1, 9: 2 };
+  const view = call('enumerationView', doc);
+  assert.match(view.against, /over the Pass 2 memo/);
+  // Only the row's own groups are compared across steps.
+  assert.equal(view.rows[1].text, 'the selected choice');
 });
 
 test('a row names the groups whose candidate differs from the selected choice, with origin and label', () => {
diff --git a/tools/dag-viewer/index.html b/tools/dag-viewer/index.html
index 91fd27265..886f94b4c 100644
--- a/tools/dag-viewer/index.html
+++ b/tools/dag-viewer/index.html
@@ -86,6 +86,7 @@
 /* Enumerated DAGs: a row cheaper than the selected plan is red. */
 #enumRows { max-height: 360px; }
 .rank button.cheaper { border-color: var(--bad); background: var(--bad-soft); }
+.chip.cheaper { color: var(--bad); border: 1px solid var(--bad); }
 /* Stage 0, 1 and 2 stack top to bottom, each as wide as the page allows. */
 .lanes { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; min-width: 0; }
 .lane .panel-head { align-items: center; }
diff --git a/tools/dag-viewer/test-fixtures/memo-enumeration-small.json b/tools/dag-viewer/test-fixtures/memo-enumeration-small.json
index c7204b64f..9e29756f4 100644
--- a/tools/dag-viewer/test-fixtures/memo-enumeration-small.json
+++ b/tools/dag-viewer/test-fixtures/memo-enumeration-small.json
@@ -1 +1 @@
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inputs"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"NonASAP":{"TimeRange":{"child":0,"kind":"range","range":{"nanos":0,"secs":60}}}},"result_kind":"range_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"value","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":1,"family":{"ExactAggregate":["Rate","Rate"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":null,"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"unknown_or_signed"}},"reduction":"PerEntity"}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"ExactAggregate":["Rate","Rate"]},"name":"state","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":{"provenance":[{"kind":"exact","reason":"exact accumulator over exact input"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"ASAP":{"FinalizeExactAccumulator":{"child":2}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"timestamp"},"name":"ts","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"value","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":0,"unique_keys":[[3,0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":3,"family":{"ExactAggregate":["Sum","Sum"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":null,"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"unknown_or_signed"}},"reduction":{"Reduce":[2]}}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"ExactAggregate":["Sum","Sum"]},"name":"state","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":{"provenance":[{"kind":"exact","reason":"exact accumulator over exact input"}],"spec":{"accuracy_metric":"absolute","accuracy_scope":"per_value","error":{"op":"zero"},"failure_probability":{"op":"zero"}}},"materialization":"NotMaterialized","operator":{"ASAP":{"FinalizeExactAccumulator":{"child":4}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"float64"},"name":"sum","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryAgg":{"child":1,"family":{"Sketch":[{"algorithm":"CmsWithHeap","category":"TopK","params":{"CmsWithHeap":{"depth":7,"heap_size":100,"width":272}}},"PerSubpopulationInstance"]},"filter":null,"grouping":"PerSubpopulationInstance","input":{"item":{"Column":{"Named":"$promql_series_identity"}},"weight":{"Column":"SampleValue"},"weight_domain":{"kind":"samples_of_metric","metric":"http_requests_total"}},"reduction":{"Reduce":[2]}}}},"result_kind":"state","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Sketch":[{"algorithm":"CmsWithHeap","category":"TopK","params":{"CmsWithHeap":{"depth":7,"heap_size":100,"width":272}}},"PerSubpopulationInstance"]},"name":"state","nullable":false,"table":null}],"time_index":null,"unique_keys":[[0]]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"ASAP":{"SummaryEstimate":{"query":{"TopK":{"k":10}},"summary_input":6}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null},{"dtype":{"Plain":"float64"},"name":"topk","nullable":false,"table":null}],"time_index":null,"unique_keys":[]},"timing":null},{"guarantee":null,"materialization":"NotMaterialized","operator":{"NonASAP":{"Project":{"child":7,"cols":[{"alias":"job","expr":{"Column":0}},{"alias":"topk_10","expr":{"Column":2}},{"alias":"$promql_series_identity","expr":{"Column":1}}],"qualifier":null}}},"result_kind":"instant_vector","schema":{"closed":true,"fields":[{"dtype":{"Plain":"utf8"},"name":"job","nullable":true,"table":null},{"dtype":{"Plain":"float64"},"name":"topk_10","nullable":false,"table":null},{"dtype":{"Plain":"utf8"},"name":"$promql_series_identity","nullable":false,"table":null}],"time_index":null,"unique_keys":[]},"timing":null}],"roots":[{"Operator":5},{"Operator":8}]},"budget_share_1":false,"selected":false,"valid":false,"rejection":"accuracy_target_missed","cost_per_second":null,"cheaper_than_selected":false}],"priced":{"count":4,"cheaper_than_selected":1,"selected_cost_per_second":2.0}}}}
diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index bcaf3303e..a27e5cf1a 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -1075,7 +1075,6 @@ def test_clicking_an_enumerated_dag_draws_it_in_the_stage1_lane(self):
         self.assertFalse(js.eval("__els.enumPanel.hidden"))
         meta = js.eval("__els['enum-meta'].textContent")
         self.assertIn("Pass 1: 4", meta)
-        self.assertIn("Pass 2: ≥ 1000", meta)
         self.assertIn("1 cheaper than the selected plan", meta)
         rows = js.eval("__els.enumRows.innerHTML")
         self.assertEqual(rows.count("<li>"), 4)
@@ -1091,6 +1090,18 @@ def test_clicking_an_enumerated_dag_draws_it_in_the_stage1_lane(self):
         js.eval("__els.pick1.__on.change({ target: { value: 'L2' } })")
         self.assertNotIn('aria-pressed="true"', js.eval("__els.enumRows.innerHTML"))
 
+    def test_an_enumerated_dag_with_fewer_root_groups_than_queries_names_no_query(self):
+        """Its roots are root groups: with one root for two queries the lane
+        labels the root as a root group, not as a query."""
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        choice = doc["memo"]["enumeration"]["choices"][0]
+        choice["dag"]["roots"] = choice["dag"]["roots"][:1]
+        js = self.page("?doc=d.json", {"d.json": json.dumps(doc)})
+        js.eval("__els.enumRows.__on.click({ target: { closest() { return { dataset: { id: 'E1' } }; } } })")
+        roots = [e["data"]["rootFor"] for e in self.ev(js, "__rendered.cy1") if e["data"].get("rootFor")]
+        self.assertEqual(roots, [["root group #1"]])
+        self.assertIn("1 root groups for 2 queries", self.text(js, "lane1-meta"))
+
     def test_a_broken_enumeration_refuses_the_document(self):
         doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
         doc["memo"]["enumeration"]["limit"] = 0

From 58575512c2f7494c75c37877bde58b96a6be739c Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 19:38:14 +0000
Subject: [PATCH 3/7] fix(dag-viewer): name enumerated roots by their root
 groups' queries

compose writes roots in increasing root-group id, not query order: name
each root by its group's roots_of from the enumerated step's memo, and
fall back to root group #n without it. No row is marked selected when the
enumerated step is earlier than the last.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/README.md            |  7 ++++--
 tools/dag-viewer/app.js               |  9 ++++----
 tools/dag-viewer/enumeration.js       | 16 +++++++++++---
 tools/dag-viewer/enumeration.test.mjs |  1 +
 tools/dag-viewer/test_viewer.py       | 32 ++++++++++++++++++---------
 5 files changed, 45 insertions(+), 20 deletions(-)

diff --git a/tools/dag-viewer/README.md b/tools/dag-viewer/README.md
index 888a9f357..87f2834d5 100644
--- a/tools/dag-viewer/README.md
+++ b/tools/dag-viewer/README.md
@@ -93,8 +93,11 @@ To run it, see [RUNNING.md](RUNNING.md).
   plan is red; the selected choice says `✓ selected`. Clicking a row draws
   its DAG in the Stage 1 lane; the document holds every listed choice's
   composed DAG, so the page composes nothing. Such a DAG has no Stage 2
-  plan, so the Stage 2 lane is cleared. Its roots are its root groups; when
-  there are fewer than queries, the lane labels them `root group #n`.
+  plan, so the Stage 2 lane is cleared. Its roots are its root groups, in
+  increasing group id; the lane names each by the queries in its group's
+  `roots_of`, or labels it `root group #n` when the enumerated step's memo is
+  not in the document. When the enumerated step is earlier than the last
+  one, no row is marked selected.
 - **Highlighting**: the **highlight query** menu dims, in every lane, what
   that query's root does not reach. Clicking a node dims everything but
   what it reads and what reads it, directly or through other nodes; clicking
diff --git a/tools/dag-viewer/app.js b/tools/dag-viewer/app.js
index 345501f3f..93c8ad43c 100644
--- a/tools/dag-viewer/app.js
+++ b/tools/dag-viewer/app.js
@@ -209,15 +209,14 @@
 
   // Draw enumerated DAG `id` of `memo.enumeration` (enumeration.js) in
   // lane 1; the document has no physical plan for it.
-  function showEnumerated(id, dag, description) {
+  function showEnumerated(id, dag, description, rootNames) {
     current = { logical: null, physical: null };
     $('pick1').value = '';
     $('pick2').value = '';
-    // Its roots are its root groups; they name queries only when there is one per query.
-    const perQuery = dag.roots.length === queryIds.length;
-    render(1, dag, false, null, perQuery ? queryIds : dag.roots.map((_, k) => `root group #${k + 1}`));
+    // Its roots are its root groups, named by the queries each answers when known.
+    render(1, dag, false, null, rootNames || dag.roots.map((_, k) => `root group #${k + 1}`));
     $('lane1-meta').innerHTML = `enumerated DAG <b>${esc(id)}</b> · ${esc(description)} · ${dag.nodes.length} nodes` +
-      (perQuery ? '' : ` · ${dag.roots.length} root groups for ${queryIds.length} queries: roots not matched to queries`);
+      (rootNames ? '' : ' · roots not matched to queries (the enumerated step’s memo is not in the document)');
     clearLane(2, 'no physical plan for an enumerated DAG');
     renderRanking();
   }
diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
index 7818195a8..4dc04c318 100644
--- a/tools/dag-viewer/enumeration.js
+++ b/tools/dag-viewer/enumeration.js
@@ -153,7 +153,15 @@ function enumerationView(doc) {
     ? `every group's candidate (no selected choice${memo.selected_choice_unavailable ? `: ${memo.selected_choice_unavailable}` : ''})`
     : sameStep ? 'groups whose candidate differs from the selected plan’s choice'
       : `groups whose candidate differs from the selected plan’s choice, which is over the ${memoStepName(lastStep)} memo: its group ids and candidate indices may not match ${name}'s, and “selected” is not meaningful`;
-  return { counts, listing, priced, against, rows };
+  // `compose` writes one root per root group, in increasing group id: root k
+  // is the k-th group with `roots_of` and names those queries. Null when the
+  // enumerated step's memo is not in the document.
+  const queryIds = ((doc.workload || {}).queries || []).map((q) => q.id);
+  const rootGroups = step && Array.isArray(step.groups)
+    ? step.groups.filter((g) => g && Array.isArray(g.roots_of) && g.roots_of.length).sort((a, b) => a.id - b.id) : null;
+  const rootNames = rootGroups
+    ? rootGroups.map((g) => g.roots_of.map((q) => queryIds[q] || `query #${q + 1}`).join(', ')) : null;
+  return { counts, listing, priced, against, rows: sameStep ? rows : rows.map((r) => ({ ...r, selected: false })), rootNames };
 }
 
 // The panel's state: the document's view, the row drawn in the Stage 1
@@ -183,7 +191,8 @@ function pressEnumeratedRow(id) {
 }
 
 // Fill the panel for `doc` (hidden without `memo.enumeration`); a click on a
-// row calls `draw(id, dag, description)` and marks the row.
+// row calls `draw(id, dag, description, rootNames)` (rootNames: the queries
+// each root answers, or null when unknown) and marks the row.
 function renderEnumeration(doc, draw) {
   const $ = (id) => document.getElementById(id);
   const state = enumerationPanel;
@@ -202,7 +211,8 @@ function renderEnumeration(doc, draw) {
     if (!button || !state.view) return;
     const choice = state.doc.memo.enumeration.choices.find((c) => c.id === button.dataset.id);
     const row = state.view.rows.find((r) => r.id === button.dataset.id);
-    state.draw(choice.id, choice.dag, row.text);
+    const names = state.view.rootNames && state.view.rootNames.length === choice.dag.roots.length ? state.view.rootNames : null;
+    state.draw(choice.id, choice.dag, row.text, names);
     pressEnumeratedRow(choice.id);
   });
 }
diff --git a/tools/dag-viewer/enumeration.test.mjs b/tools/dag-viewer/enumeration.test.mjs
index 195c4b524..15925eadd 100644
--- a/tools/dag-viewer/enumeration.test.mjs
+++ b/tools/dag-viewer/enumeration.test.mjs
@@ -100,6 +100,7 @@ test('a selected choice over a later step than the enumerated one is flagged', (
   doc.memo.selected_choice = { 7: 1, 9: 2 };
   const view = call('enumerationView', doc);
   assert.match(view.against, /over the Pass 2 memo/);
+  assert.ok(view.rows.every((r) => !r.selected));
   // Only the row's own groups are compared across steps.
   assert.equal(view.rows[1].text, 'the selected choice');
 });
diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index a27e5cf1a..04f524df0 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -1090,17 +1090,29 @@ def test_clicking_an_enumerated_dag_draws_it_in_the_stage1_lane(self):
         js.eval("__els.pick1.__on.change({ target: { value: 'L2' } })")
         self.assertNotIn('aria-pressed="true"', js.eval("__els.enumRows.innerHTML"))
 
-    def test_an_enumerated_dag_with_fewer_root_groups_than_queries_names_no_query(self):
-        """Its roots are root groups: with one root for two queries the lane
-        labels the root as a root group, not as a query."""
-        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
-        choice = doc["memo"]["enumeration"]["choices"][0]
-        choice["dag"]["roots"] = choice["dag"]["roots"][:1]
+    def enumerated_roots(self, doc, choice_id):
         js = self.page("?doc=d.json", {"d.json": json.dumps(doc)})
-        js.eval("__els.enumRows.__on.click({ target: { closest() { return { dataset: { id: 'E1' } }; } } })")
-        roots = [e["data"]["rootFor"] for e in self.ev(js, "__rendered.cy1") if e["data"].get("rootFor")]
-        self.assertEqual(roots, [["root group #1"]])
-        self.assertIn("1 root groups for 2 queries", self.text(js, "lane1-meta"))
+        js.eval(f"__els.enumRows.__on.click({{ target: {{ closest() {{ return {{ dataset: {{ id: {json.dumps(choice_id)} }} }}; }} }} }})")
+        roots = {e["data"]["nodeId"]: e["data"]["rootFor"] for e in self.ev(js, "__rendered.cy1") if e["data"].get("rootFor")}
+        return roots, self.text(js, "lane1-meta")
+
+    def test_enumerated_roots_are_named_by_their_root_groups_queries(self):
+        """Roots come in increasing root-group id, not query order: with G3
+        the root of q2 and G7 the root of q1, the first root is q2's."""
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        groups = {g["id"]: g for g in doc["memo"]["steps"][1]["groups"]}
+        groups[3]["roots_of"], groups[7]["roots_of"] = [1], [0]
+        dag = doc["memo"]["enumeration"]["choices"][0]["dag"]
+        first, second = (r["Operator"] for r in dag["roots"])
+        roots, _ = self.enumerated_roots(doc, "E1")
+        self.assertEqual(roots, {first: ["q2"], second: ["q1"]})
+
+    def test_enumerated_roots_without_the_steps_memo_name_no_query(self):
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        doc["memo"]["steps"] = doc["memo"]["steps"][:1]
+        roots, meta = self.enumerated_roots(doc, "E1")
+        self.assertEqual(sorted(roots.values()), [["root group #1"], ["root group #2"]])
+        self.assertIn("roots not matched to queries", meta)
 
     def test_a_broken_enumeration_refuses_the_document(self):
         doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}

From f93d9794bff176e03632da9bf1f5e4db8c12d86c Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 19:39:34 +0000
Subject: [PATCH 4/7] fix(dag-viewer): draw an enumerated DAG with one root per
 query

A root group answering several queries is each one's root, so highlighting
any of them keeps it bright; the lane note no longer guesses a reason when
roots cannot be matched.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/README.md      |  6 +++---
 tools/dag-viewer/app.js         |  9 +++++----
 tools/dag-viewer/enumeration.js | 32 ++++++++++++++++++++------------
 tools/dag-viewer/test_viewer.py | 17 +++++++++++++++++
 4 files changed, 45 insertions(+), 19 deletions(-)

diff --git a/tools/dag-viewer/README.md b/tools/dag-viewer/README.md
index 87f2834d5..ebd5ddd4f 100644
--- a/tools/dag-viewer/README.md
+++ b/tools/dag-viewer/README.md
@@ -94,9 +94,9 @@ To run it, see [RUNNING.md](RUNNING.md).
   its DAG in the Stage 1 lane; the document holds every listed choice's
   composed DAG, so the page composes nothing. Such a DAG has no Stage 2
   plan, so the Stage 2 lane is cleared. Its roots are its root groups, in
-  increasing group id; the lane names each by the queries in its group's
-  `roots_of`, or labels it `root group #n` when the enumerated step's memo is
-  not in the document. When the enumerated step is earlier than the last
+  increasing group id; the lane draws each as the root of the queries in its
+  group's `roots_of`, or labels it `root group #n` when that cannot be
+  matched (the enumerated step's memo is not in the document). When the enumerated step is earlier than the last
   one, no row is marked selected.
 - **Highlighting**: the **highlight query** menu dims, in every lane, what
   that query's root does not reach. Clicking a node dims everything but
diff --git a/tools/dag-viewer/app.js b/tools/dag-viewer/app.js
index 93c8ad43c..1b7603050 100644
--- a/tools/dag-viewer/app.js
+++ b/tools/dag-viewer/app.js
@@ -209,14 +209,15 @@
 
   // Draw enumerated DAG `id` of `memo.enumeration` (enumeration.js) in
   // lane 1; the document has no physical plan for it.
-  function showEnumerated(id, dag, description, rootNames) {
+  function showEnumerated(id, dag, description, perQueryDag) {
     current = { logical: null, physical: null };
     $('pick1').value = '';
     $('pick2').value = '';
-    // Its roots are its root groups, named by the queries each answers when known.
-    render(1, dag, false, null, rootNames || dag.roots.map((_, k) => `root group #${k + 1}`));
+    // Its roots are its root groups; drawn per query when they map to queries.
+    if (perQueryDag) render(1, perQueryDag, false, null);
+    else render(1, dag, false, null, dag.roots.map((_, k) => `root group #${k + 1}`));
     $('lane1-meta').innerHTML = `enumerated DAG <b>${esc(id)}</b> · ${esc(description)} · ${dag.nodes.length} nodes` +
-      (rootNames ? '' : ' · roots not matched to queries (the enumerated step’s memo is not in the document)');
+      (perQueryDag ? '' : ' · roots not matched to queries');
     clearLane(2, 'no physical plan for an enumerated DAG');
     renderRanking();
   }
diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
index 4dc04c318..aa2d94f49 100644
--- a/tools/dag-viewer/enumeration.js
+++ b/tools/dag-viewer/enumeration.js
@@ -154,14 +154,21 @@ function enumerationView(doc) {
     : sameStep ? 'groups whose candidate differs from the selected plan’s choice'
       : `groups whose candidate differs from the selected plan’s choice, which is over the ${memoStepName(lastStep)} memo: its group ids and candidate indices may not match ${name}'s, and “selected” is not meaningful`;
   // `compose` writes one root per root group, in increasing group id: root k
-  // is the k-th group with `roots_of` and names those queries. Null when the
-  // enumerated step's memo is not in the document.
-  const queryIds = ((doc.workload || {}).queries || []).map((q) => q.id);
-  const rootGroups = step && Array.isArray(step.groups)
-    ? step.groups.filter((g) => g && Array.isArray(g.roots_of) && g.roots_of.length).sort((a, b) => a.id - b.id) : null;
-  const rootNames = rootGroups
-    ? rootGroups.map((g) => g.roots_of.map((q) => queryIds[q] || `query #${q + 1}`).join(', ')) : null;
-  return { counts, listing, priced, against, rows: sameStep ? rows : rows.map((r) => ({ ...r, selected: false })), rootNames };
+  // is the k-th group with `roots_of`, the query positions it answers. Null
+  // when the enumerated step's memo is not in the document.
+  const rootQueries = step && Array.isArray(step.groups)
+    ? step.groups.filter((g) => g && Array.isArray(g.roots_of) && g.roots_of.length).sort((a, b) => a.id - b.id).map((g) => g.roots_of) : null;
+  return { counts, listing, priced, against, rows: sameStep ? rows : rows.map((r) => ({ ...r, selected: false })), rootQueries };
+}
+
+// `dag` with one root per workload query (query q's root is the root of the
+// group whose `roots_of` holds q), the shape the lanes draw; null when
+// `rootQueries` does not cover every query with one root each.
+function enumeratedDagPerQuery(dag, rootQueries, queryCount) {
+  if (!rootQueries || rootQueries.length !== dag.roots.length) return null;
+  const roots = new Array(queryCount).fill(null);
+  rootQueries.forEach((queries, k) => queries.forEach((q) => { if (q >= 0 && q < queryCount) roots[q] = dag.roots[k]; }));
+  return roots.every(Boolean) ? { ...dag, roots } : null;
 }
 
 // The panel's state: the document's view, the row drawn in the Stage 1
@@ -191,8 +198,9 @@ function pressEnumeratedRow(id) {
 }
 
 // Fill the panel for `doc` (hidden without `memo.enumeration`); a click on a
-// row calls `draw(id, dag, description, rootNames)` (rootNames: the queries
-// each root answers, or null when unknown) and marks the row.
+// row calls `draw(id, dag, description, perQueryDag)` (perQueryDag: `dag`
+// with one root per query, or null when the roots cannot be matched to
+// queries) and marks the row.
 function renderEnumeration(doc, draw) {
   const $ = (id) => document.getElementById(id);
   const state = enumerationPanel;
@@ -211,8 +219,8 @@ function renderEnumeration(doc, draw) {
     if (!button || !state.view) return;
     const choice = state.doc.memo.enumeration.choices.find((c) => c.id === button.dataset.id);
     const row = state.view.rows.find((r) => r.id === button.dataset.id);
-    const names = state.view.rootNames && state.view.rootNames.length === choice.dag.roots.length ? state.view.rootNames : null;
-    state.draw(choice.id, choice.dag, row.text, names);
+    state.draw(choice.id, choice.dag, row.text,
+      enumeratedDagPerQuery(choice.dag, state.view.rootQueries, state.doc.workload.queries.length));
     pressEnumeratedRow(choice.id);
   });
 }
diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index 04f524df0..b50e38c28 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -1107,6 +1107,23 @@ def test_enumerated_roots_are_named_by_their_root_groups_queries(self):
         roots, _ = self.enumerated_roots(doc, "E1")
         self.assertEqual(roots, {first: ["q2"], second: ["q1"]})
 
+    def test_a_root_group_shared_by_two_queries_is_both_queries_root(self):
+        """One root group answering q1 and q2: its root is the root of both,
+        and highlighting q2 keeps it bright."""
+        doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
+        groups = {g["id"]: g for g in doc["memo"]["steps"][1]["groups"]}
+        groups[3]["roots_of"], groups[7]["roots_of"] = [0, 1], []
+        choice = doc["memo"]["enumeration"]["choices"][0]
+        choice["dag"]["roots"] = choice["dag"]["roots"][:1]
+        root = choice["dag"]["roots"][0]["Operator"]
+        js = self.page("?doc=d.json", {"d.json": json.dumps(doc)})
+        js.eval("__els.enumRows.__on.click({ target: { closest() { return { dataset: { id: 'E1' } }; } } })")
+        roots = {e["data"]["nodeId"]: e["data"]["rootFor"] for e in self.ev(js, "__rendered.cy1") if e["data"].get("rootFor")}
+        self.assertEqual(roots, {root: ["q1", "q2"]})
+        js.eval("__els.queryPick.__on.change({ target: { value: 'q2' } })")
+        self.assertNotIn(f"n{root}", self.ev(js, "__dimmed.cy1"))
+        self.assertNotIn("not matched", self.text(js, "lane1-meta"))
+
     def test_enumerated_roots_without_the_steps_memo_name_no_query(self):
         doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
         doc["memo"]["steps"] = doc["memo"]["steps"][:1]

From 147a7c0c74669c6ac4916f24e7267dd38d80fb2e Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 20:33:21 +0000
Subject: [PATCH 5/7] feat(dag-viewer): show an enumerated choice that does not
 compose

#1003 may write "dag": null with "error" for a choice that does not
compose: accept it, show the error, and leave the row unclickable.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/enumeration.js       | 19 +++++++++++++------
 tools/dag-viewer/enumeration.test.mjs | 11 +++++++++++
 2 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
index aa2d94f49..f27b4ff55 100644
--- a/tools/dag-viewer/enumeration.js
+++ b/tools/dag-viewer/enumeration.js
@@ -58,9 +58,14 @@ function validateMemoEnumeration(doc) {
     if (!enumerationIsObject(entry)) return;
     const where = `${at}.choices[${index}]`;
     if (!isMemoChoice(entry.choice)) errors.push(`${where}.choice must map group ids to candidate indices`);
-    // One root per root group, which need not be one per query.
-    const roots = entry.dag && Array.isArray(entry.dag.roots) ? entry.dag.roots.length : 0;
-    errors.push(...validateLogicalDag(entry.dag, where, roots));
+    // A choice that does not compose has no DAG but its error.
+    if (entry.dag === null) {
+      if (typeof entry.error !== 'string') errors.push(`${where}: needs a dag or an error`);
+    } else {
+      // One root per root group, which need not be one per query.
+      const roots = entry.dag && Array.isArray(entry.dag.roots) ? entry.dag.roots.length : 0;
+      errors.push(...validateLogicalDag(entry.dag, where, roots));
+    }
     ['budget_share_1', 'selected'].forEach((field) => {
       if (typeof entry[field] !== 'boolean') errors.push(`${where}.${field} must be true or false`);
     });
@@ -139,7 +144,8 @@ function enumerationView(doc) {
         ? changes.map((c) => (c.index === null ? `G${c.group} not read`
           : `G${c.group} → #${c.index}${c.label ? ` ${c.label}` : ''}${c.origin ? ` (${c.origin})` : ''}`)).join(' · ')
         : 'the selected choice',
-      nodes: entry.dag.nodes.length,
+      nodes: entry.dag ? entry.dag.nodes.length : null,
+      error: entry.dag ? null : entry.error,
       budgetShare1: entry.budget_share_1,
       selected: entry.selected,
       priced: 'valid' in entry,
@@ -185,9 +191,9 @@ function enumerationRowHtml(row, pressed) {
     row.budgetShare1 ? '' : '<span class="chip">budget share &lt; 1</span>',
   ].join('');
   const cost = row.cost === null ? (row.priced ? '—' : '') : String(Number(row.cost.toPrecision(4)));
-  return `<li><button type="button" data-id="${esc(row.id)}" aria-pressed="${row.id === pressed}"${row.cheaper ? ' class="cheaper"' : ''}>` +
+  return `<li><button type="button" data-id="${esc(row.id)}" aria-pressed="${row.id === pressed}"${row.cheaper ? ' class="cheaper"' : ''}${row.error ? ' disabled' : ''}>` +
     `<span class="pid">${esc(row.id)}</span><span class="plabel">${esc(row.text)}</span><span class="ptotal">${cost}</span>` +
-    `<span class="pstatus">${chips}${row.rejection ? `<span>${esc(row.rejection.replace(/_/g, ' '))}</span>` : ''}<span>${row.nodes} nodes</span></span></button></li>`;
+    `<span class="pstatus">${chips}${row.rejection ? `<span>${esc(row.rejection.replace(/_/g, ' '))}</span>` : ''}${row.error ? `<span class="error">does not compose: ${esc(row.error)}</span>` : `<span>${row.nodes} nodes</span>`}</span></button></li>`;
 }
 
 // Mark row `id` (null: none) as the one the Stage 1 lane draws.
@@ -218,6 +224,7 @@ function renderEnumeration(doc, draw) {
     const button = event.target && event.target.closest ? event.target.closest('button[data-id]') : null;
     if (!button || !state.view) return;
     const choice = state.doc.memo.enumeration.choices.find((c) => c.id === button.dataset.id);
+    if (!choice.dag) return;
     const row = state.view.rows.find((r) => r.id === button.dataset.id);
     state.draw(choice.id, choice.dag, row.text,
       enumeratedDagPerQuery(choice.dag, state.view.rootQueries, state.doc.workload.queries.length));
diff --git a/tools/dag-viewer/enumeration.test.mjs b/tools/dag-viewer/enumeration.test.mjs
index 15925eadd..7cf19f73b 100644
--- a/tools/dag-viewer/enumeration.test.mjs
+++ b/tools/dag-viewer/enumeration.test.mjs
@@ -116,6 +116,17 @@ test('a row names the groups whose candidate differs from the selected choice, w
   assert.ok(rows.every((r) => !r.priced && r.cost === null && !r.cheaper));
 });
 
+test('a choice that does not compose has its error instead of a DAG and is not clickable', () => {
+  const doc = unpriced();
+  doc.memo.enumeration.choices[3].dag = null;
+  assert.ok(call('validateMemoEnumeration', doc).some((e) => e.includes('choices[3]: needs a dag or an error')));
+  doc.memo.enumeration.choices[3].error = 'cycle';
+  assert.deepEqual(call('validateMemoEnumeration', doc), []);
+  const row = call('enumerationView', doc).rows[3];
+  assert.equal(row.error, 'cycle');
+  assert.match(context.enumerationRowHtml(row, null), /disabled>.*does not compose: cycle/);
+});
+
 test('without the step in memo.steps a row names only the candidate index', () => {
   const doc = unpriced();
   doc.memo.steps = [];

From 24db35e1b0d290cd97bb023ceea8b8b9c50698c3 Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 20:39:14 +0000
Subject: [PATCH 6/7] test(dag-viewer): the Enumerated DAGs panel on the
 ratio-of-quantiles example

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/test_viewer.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index b50e38c28..61e62dd1b 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -31,6 +31,9 @@
 # A hand-written priced `memo` section for Example 1: four enumerated
 # Pass 1 DAGs, E2 selected, E3 cheaper than it, E4 invalid.
 MEMO_ENUMERATION = HERE / "test-fixtures" / "memo-enumeration-small.json"
+# stage_pipeline's memo example (#1003): the ratio of quantiles, with its
+# Pass 1 memo enumerated (49 = 7 × 7 candidate DAGs).
+MEMO_RATIO = HERE / "examples" / "memo-ratio-of-quantiles.json"
 WORKLOADS = HERE / "workloads"
 # Standalone scalar queries at positions 0, 2 and 4 (first, middle, last):
 # scalar(sum(m)), sum(n), time(), sum by (job) (k), 1 + 2.
@@ -1131,6 +1134,27 @@ def test_enumerated_roots_without_the_steps_memo_name_no_query(self):
         self.assertEqual(sorted(roots.values()), [["root group #1"], ["root group #2"]])
         self.assertIn("roots not matched to queries", meta)
 
+    def test_the_ratio_of_quantiles_example_lists_its_pass1_dags_and_draws_one(self):
+        """On stage_pipeline's own example the panel counts 49 Pass 1 DAGs,
+        lists them all, and a click redraws the Stage 1 lane with that DAG
+        and clears Stage 2."""
+        doc = json.loads(MEMO_RATIO.read_text())
+        js = self.page("?doc=m.json", {"m.json": json.dumps(doc)})
+        self.assertFalse(js.eval("__els.enumPanel.hidden"))
+        meta = js.eval("__els['enum-meta'].textContent")
+        self.assertIn("Pass 1: 49", meta)
+        self.assertIn("listed: all 49 Pass 1 DAGs", meta)
+        self.assertEqual(js.eval("__els.enumRows.innerHTML").count("<li>"), 49)
+        before = self.ev(js, "__rendered.cy1")
+        choice = doc["memo"]["enumeration"]["choices"][1]
+        js.eval(f"__els.enumRows.__on.click({{ target: {{ closest() {{ return {{ dataset: {{ id: {json.dumps(choice['id'])} }} }}; }} }} }})")
+        after = self.ev(js, "__rendered.cy1")
+        self.assertNotEqual(after, before)
+        self.assertEqual(len([e for e in after if "source" not in e["data"]]), len(choice["dag"]["nodes"]))
+        self.assertEqual([e["data"]["rootFor"] for e in after if e["data"].get("rootFor")], [[doc["workload"]["queries"][0]["id"]]])
+        self.assertIn(f"enumerated DAG {choice['id']}", self.text(js, "lane1-meta"))
+        self.assertIn("no physical plan for an enumerated DAG", js.eval("__els['lane2-meta'].textContent"))
+
     def test_a_broken_enumeration_refuses_the_document(self):
         doc = {**example1(), **json.loads(MEMO_ENUMERATION.read_text())}
         doc["memo"]["enumeration"]["limit"] = 0

From 59f46d2e7d1ed96b9117e6ed075192d3d6990fa4 Mon Sep 17 00:00:00 2001
From: zzylol <50204836+zzylol@users.noreply.github.com>
Date: Wed, 28 Oct 2026 20:40:30 +0000
Subject: [PATCH 7/7] fix(dag-viewer): review nits on the Enumerated DAGs panel

Require a non-empty error for a choice without a DAG, check the
cross-step header on the real example, and use its counts in the docs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 tools/dag-viewer/README.md      | 4 ++--
 tools/dag-viewer/enumeration.js | 6 +++---
 tools/dag-viewer/test_viewer.py | 3 +++
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/tools/dag-viewer/README.md b/tools/dag-viewer/README.md
index ebd5ddd4f..de40e2759 100644
--- a/tools/dag-viewer/README.md
+++ b/tools/dag-viewer/README.md
@@ -78,8 +78,8 @@ To run it, see [RUNNING.md](RUNNING.md).
   This is display only: the document keeps the chain.
 - **Enumerated DAGs**, between the Stage 0 and Stage 1 lanes, shown only
   when the document has `memo.enumeration`: the complete candidate DAGs the
-  memo stands for. The header counts them after each memo step (`Pass 1:
-  343 · Pass 2: ≥ 1000`; `≥` and the limit when counting stopped), says how
+  memo stands for. The header counts them after each memo step (`Stage 0: 1 ·
+  Pass 1: 49 · Pass 2: ≥ 1000 · concrete states: ≥ 1000`; `≥` and the limit when counting stopped), says how
   many of the enumerated step's DAGs the document lists, and, when they were
   priced, how many are cheaper than the selected plan. Each row names the
   groups whose candidate differs from the selected plan's choice
diff --git a/tools/dag-viewer/enumeration.js b/tools/dag-viewer/enumeration.js
index f27b4ff55..a1ea331a5 100644
--- a/tools/dag-viewer/enumeration.js
+++ b/tools/dag-viewer/enumeration.js
@@ -60,7 +60,7 @@ function validateMemoEnumeration(doc) {
     if (!isMemoChoice(entry.choice)) errors.push(`${where}.choice must map group ids to candidate indices`);
     // A choice that does not compose has no DAG but its error.
     if (entry.dag === null) {
-      if (typeof entry.error !== 'string') errors.push(`${where}: needs a dag or an error`);
+      if (typeof entry.error !== 'string' || !entry.error) errors.push(`${where}: needs a dag or an error`);
     } else {
       // One root per root group, which need not be one per query.
       const roots = entry.dag && Array.isArray(entry.dag.roots) ? entry.dag.roots.length : 0;
@@ -81,13 +81,13 @@ function validateMemoEnumeration(doc) {
   return errors;
 }
 
-// "343", or "≥ 1000" when the count stopped at the limit.
+// "49", or "≥ 1000" when the count stopped at the limit.
 function enumerationCountText(entry, limit) {
   return entry.complete ? String(entry.count) : `≥ ${limit}`;
 }
 
 // The panel's content, or null for a document without `memo.enumeration`:
-// `counts` ("Stage 0: 1 · Pass 1: 343 · Pass 2: ≥ 1000"), `listing` (what the
+// `counts` ("Stage 0: 1 · Pass 1: 49 · Pass 2: ≥ 1000"), `listing` (what the
 // rows are), `priced` (the pricing summary, "" when not priced), and one row
 // per listed choice. A row's `changes` are the groups whose candidate differs
 // from `selected_choice` (every group of the choice when there is none), each
diff --git a/tools/dag-viewer/test_viewer.py b/tools/dag-viewer/test_viewer.py
index 61e62dd1b..7cc2be847 100644
--- a/tools/dag-viewer/test_viewer.py
+++ b/tools/dag-viewer/test_viewer.py
@@ -1144,6 +1144,9 @@ def test_the_ratio_of_quantiles_example_lists_its_pass1_dags_and_draws_one(self)
         meta = js.eval("__els['enum-meta'].textContent")
         self.assertIn("Pass 1: 49", meta)
         self.assertIn("listed: all 49 Pass 1 DAGs", meta)
+        # The selected choice is over the last step (concrete states), not Pass 1.
+        self.assertIn("over the concrete states memo", meta)
+        self.assertNotIn("✓ selected", js.eval("__els.enumRows.innerHTML"))
         self.assertEqual(js.eval("__els.enumRows.innerHTML").count("<li>"), 49)
         before = self.ev(js, "__rendered.cy1")
         choice = doc["memo"]["enumeration"]["choices"][1]