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/**
* Test that a $project with a combination of expressions and field projections gets evaluted
* correctly, and overwrites the data present in the input document when necessary.
*/
(function() {
const coll = db.project_with_expressions;
coll.drop();
assert.commandWorked(coll.insert({_id: 0, a: {subObj1: {p: 1}, subObj2: {p: 1}, subObj3: {p: 1}}}));
function assertProjectionResultForFindAndAgg(projection, expectedResults) {
const aggResults = coll.aggregate([{$project: projection}]).toArray();
const aggNoPushdownResults =
coll.aggregate([{$_internalInhibitOptimization: {}}, {$project: projection}]).toArray();
const findResults = coll.find({}, projection).toArray();
assert.eq(aggResults, expectedResults);
assert.eq(aggNoPushdownResults, expectedResults);
assert.eq(findResults, expectedResults);
}
// Case where a project with a valid sub-object, a project with missing sub-object and a project
// with sub-expression share a common parent, and the projection is represented using a dotted path.
assertProjectionResultForFindAndAgg(
{_id: 0, "a.subObj1": {$literal: 1}, "a.subObj2": 1, "a.subObj3.q": 1},
[{a: {subObj2: {p: 1}, subObj3: {}, subObj1: 1}}]);
assertProjectionResultForFindAndAgg(
{_id: 0, "a.subObj2": 1, "a.subObj1": {$literal: 1}, "a.subObj3.q": {r: 1}},
[{a: {subObj2: {p: 1}, subObj3: {}, subObj1: 1}}]);
// Case where a project with a valid sub-object, a project with missing sub-object and a project
// with sub-expression share a common parent, and the projection is represented using sub-objects.
assertProjectionResultForFindAndAgg(
{_id: 0, a: {subObj1: {$literal: 1}, subObj2: 1, subObj3: {q: {r: 1}}}},
[{a: {subObj2: {p: 1}, subObj3: {}, subObj1: 1}}]);
assertProjectionResultForFindAndAgg(
{_id: 0, a: {subObj2: 1, subObj1: {$literal: 1}, subObj3: {q: 1}}},
[{a: {subObj2: {p: 1}, subObj3: {}, subObj1: 1}}]);
})();
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