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/**
* Test expected behavior for hidden indexes. A hidden index is invisible to the query planner so
* it will not be used in planning. It is handled in the same way as other indexes by the index
* catalog and for TTL purposes.
* @tags: [
* # CollMod is not retryable.
* requires_non_retryable_commands,
* sbe_incompatible,
* ]
*/
(function() {
'use strict';
load("jstests/libs/analyze_plan.js"); // For getPlanStages.
load("jstests/libs/collection_drop_recreate.js"); // For assert[Drop|Create]Collection.
load("jstests/libs/fixture_helpers.js"); // For FixtureHelpers.
load("jstests/libs/get_index_helpers.js"); // For GetIndexHelpers.findByName.
const collName = "hidden_index";
let coll = assertDropAndRecreateCollection(db, collName);
function numOfUsedIXSCAN(query) {
const explain = assert.commandWorked(coll.find(query).explain());
const ixScans = getPlanStages(explain.queryPlanner.winningPlan, "IXSCAN");
return ixScans.length;
}
function validateHiddenIndexBehaviour(query, index_type, wildcard) {
let index_name;
if (wildcard)
index_name = 'a.$**_' + index_type;
else
index_name = 'a_' + index_type;
if (wildcard)
assert.commandWorked(coll.createIndex({"a.$**": index_type}));
else
assert.commandWorked(coll.createIndex({"a": index_type}));
let idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), index_name);
assert.eq(idxSpec.hidden, undefined);
assert.gt(numOfUsedIXSCAN(query), 0);
assert.commandWorked(coll.hideIndex(index_name));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), index_name);
assert(idxSpec.hidden);
if (index_type === "text") {
assert.commandFailedWithCode(coll.runCommand("find", {filter: query}, {hint: {a: 1}}), 291);
assert.commandWorked(coll.dropIndexes());
return;
}
assert.eq(numOfUsedIXSCAN(query), 0);
assert.commandWorked(coll.unhideIndex(index_name));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), index_name);
assert.eq(idxSpec.hidden, undefined);
assert.gt(numOfUsedIXSCAN(query), 0);
assert.commandWorked(coll.dropIndex(index_name));
if (wildcard)
assert.commandWorked(coll.createIndex({"a.$**": index_type}, {hidden: true}));
else
assert.commandWorked(coll.createIndex({"a": index_type}, {hidden: true}));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), index_name);
assert(idxSpec.hidden);
assert.eq(numOfUsedIXSCAN(query), 0);
assert.commandWorked(coll.dropIndexes());
}
// Normal index testing.
validateHiddenIndexBehaviour({a: 1}, 1);
// GEO index testing.
validateHiddenIndexBehaviour({
a: {$geoWithin: {$geometry: {type: "Polygon", coordinates: [[[0, 0], [3, 6], [6, 1], [0, 0]]]}}}
},
"2dsphere");
// Fts index.
validateHiddenIndexBehaviour({$text: {$search: "java"}}, "text");
// Wildcard index.
validateHiddenIndexBehaviour({"a.f": 1}, 1, true);
// Hidden index on capped collection.
if (!FixtureHelpers.isMongos(db)) {
coll = assertDropAndRecreateCollection(db, collName, {capped: true, size: 100});
validateHiddenIndexBehaviour({a: 1}, 1);
coll = assertDropAndRecreateCollection(db, collName);
}
// Test that index 'hidden' status can be found in listIndexes command.
assert.commandWorked(coll.createIndex({lsIdx: 1}, {hidden: true}));
let res = assert.commandWorked(db.runCommand({"listIndexes": collName}));
let idxSpec = GetIndexHelpers.findByName(res.cursor.firstBatch, "lsIdx_1");
assert.eq(idxSpec.hidden, true);
// Can't hide any index in a system collection.
const systemColl = db.getSiblingDB('admin').system.version;
assert.commandWorked(systemColl.createIndex({a: 1}));
assert.commandFailedWithCode(systemColl.hideIndex("a_1"), 2);
assert.commandFailedWithCode(systemColl.createIndex({a: 1}, {hidden: true}), 2);
// Can't hide the '_id' index.
assert.commandFailed(coll.hideIndex("_id_"));
// Can't 'hint' a hidden index.
assert.commandWorked(coll.createIndex({"a": 1}, {"hidden": true}));
assert.commandFailedWithCode(coll.runCommand("find", {hint: {a: 1}}), 2);
// We can change ttl index and hide info at the same time.
assert.commandWorked(coll.dropIndexes());
assert.commandWorked(coll.createIndex({"tm": 1}, {expireAfterSeconds: 10}));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), "tm_1");
assert.eq(idxSpec.hidden, undefined);
assert.eq(idxSpec.expireAfterSeconds, 10);
db.runCommand({
"collMod": coll.getName(),
"index": {"name": "tm_1", "expireAfterSeconds": 1, "hidden": true}
});
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), "tm_1");
assert(idxSpec.hidden);
assert.eq(idxSpec.expireAfterSeconds, 1);
//
// Ensure that "hidden: false" won't be added to index specification.
//
assert.commandWorked(
db.runCommand({createIndexes: collName, indexes: [{key: {y: 1}, name: "y", hidden: false}]}));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), "y");
assert.eq(idxSpec.hidden, undefined);
assert.commandWorked(coll.hideIndex("y"));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), "y");
assert(idxSpec.hidden);
// Ensure that unhiding the hidden index won't add 'hidden: false' to the index spec as well.
assert.commandWorked(coll.unhideIndex("y"));
idxSpec = GetIndexHelpers.findByName(coll.getIndexes(), "y");
assert.eq(idxSpec.hidden, undefined);
})();
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