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/**
* Tests to verify that the queries return correct results in the presence of partial hashed
* index and sparse index. The test verifies compound hashed index with hashed prefix and non-hashed
* prefix.
*
* @tags: [requires_fcv_44]
*/
(function() {
"use strict";
load("jstests/aggregation/extras/utils.js"); // For arrayEq().
load("jstests/libs/analyze_plan.js"); // For assertStagesForExplainOfCommand().
const coll = db.hashed_partial_index;
coll.drop();
assert.commandWorked(coll.insert({}));
assert.commandWorked(coll.insert({a: null}));
assert.commandWorked(coll.insert({a: 1}));
assert.commandWorked(coll.insert({b: 4}));
assert.commandWorked(coll.insert({a: 1, b: 6}));
/**
* Runs find command with the 'filter' and validates that the output returned matches
* 'expectedOutput'. Also runs explain() command on the same find command and validates that all
* the 'expectedStages' are present in the plan returned.
*/
function validateFindCmdOutputAndPlan({filter, expectedStages, expectedOutput}) {
const cmdObj = {find: coll.getName(), filter: filter, projection: {_id: 0}};
if (expectedOutput) {
const res = assert.commandWorked(coll.runCommand(cmdObj));
const ouputArray = new DBCommandCursor(coll.getDB(), res).toArray();
// We ignore the order since hashed index order is not predictable.
assert(arrayEq(expectedOutput, ouputArray), ouputArray);
}
assertStagesForExplainOfCommand({coll: coll, cmdObj: cmdObj, expectedStages: expectedStages});
}
/**
* Tests for sparse indexes.
*/
assert.commandWorked(coll.createIndex({a: 1, b: "hashed", c: -1}, {sparse: true}));
// Verify index not used for null/missing queries with sparse index.
validateFindCmdOutputAndPlan({filter: {a: null}, expectedStages: ["COLLSCAN"]});
validateFindCmdOutputAndPlan({filter: {a: {$exists: false}}, expectedStages: ["COLLSCAN"]});
// Verify index can be used for non-null queries with sparse index.
validateFindCmdOutputAndPlan({
filter: {a: {$exists: true}},
expectedOutput: [{a: null}, {a: 1}, {a: 1, b: 6}],
expectedStages: ["IXSCAN", "FETCH"]
});
validateFindCmdOutputAndPlan(
{filter: {a: 1, b: 6}, expectedOutput: [{a: 1, b: 6}], expectedStages: ["IXSCAN", "FETCH"]});
/**
* Tests for partial indexes.
*/
[{b: "hashed", c: 1}, {b: 1, c: "hashed", d: 1}].forEach((index) => {
assert.commandWorked(coll.dropIndexes());
assert.commandWorked(coll.createIndex(index, {partialFilterExpression: {b: {$gt: 5}}}));
// Verify that index is not used if the query predicate doesn't match the
// 'partialFilterExpression'.
validateFindCmdOutputAndPlan({filter: {b: 4}, expectedStages: ["COLLSCAN"]});
// Verify that index is used if the query predicate matches the 'partialFilterExpression'.
validateFindCmdOutputAndPlan(
{filter: {b: 6}, expectedOutput: [{a: 1, b: 6}], expectedStages: ["IXSCAN", "FETCH"]});
});
})();
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