gistfile1.txt

jsTestLog("Testing wildcard index on time-series collection.");
resetCollections();

// Create a wildcard index on the time-series collection.
const wildcardTimeseriesIndexSpec = {
    [metaFieldName + '.$**']: 1
};
const wildcardBucketsIndexSpec = {
    ['meta.$**']: 1
};
assert.commandWorked(
    timeseriescoll.createIndex(wildcardTimeseriesIndexSpec),
    'Failed to create a wildcard index with: ' + tojson(wildcardTimeseriesIndexSpec));

const wildcard1Doc = {
    _id: 0,
    [timeFieldName]: ISODate(),
    [metaFieldName]: {a: 1, b: 1, c: {d: 1, e: 1}},
};
const wildcard2Doc = {
    _id: 1,
    [timeFieldName]: ISODate(),
    [metaFieldName]: {a: 2, b: 2, c: {d: 1, e: 2}},
};
const wildcard3Doc = {
    _id: 0,
    [timeFieldName]: ISODate(),
    [metaFieldName]:
        {a: 3, b: 3, c: {d: 3, e: 3}, d: [{zip: '01234', town: 'nyc'}, {zip: '43210', town: 'sf'}]},
};
assert.commandWorked(timeseriescoll.insert(wildcard1Doc));
assert.commandWorked(timeseriescoll.insert(wildcard2Doc));
assert.commandWorked(timeseriescoll.insert(wildcard3Doc));

const bucketsWildcardFindExplain =
    assert.commandWorked(bucketscoll.find().hint(wildcardBucketsIndexSpec).explain());
const planWildcardStage =
    getPlanStage(getWinningPlan(bucketsWildcardFindExplain.queryPlanner), "IXSCAN");
assert.eq(true,
          planWildcardStage.isMultiKey,
          "Index should have been marked as multikey: " + tojson(planWildcardStage));
assert.eq({"meta.a": ["meta.a"]},
          planWildcardStage.multiKeyPaths,
          "Index has wrong multikey paths after insert; plan: " + tojson(planWildcardStage));