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// Test that excluding a non-existent field does not affect the field order produced by subsequent
// changes.
//
// This is designed as a regression test for SERVER-37791.
(function() {
"use strict";
const coll = db.exclusion_projection_does_not_affect_field_order;
coll.drop();
assert.commandWorked(coll.insert({_id: 1}));
assert.commandWorked(coll.insert({_id: 2, c: 1}));
assert.commandWorked(coll.insert({_id: 3, y: 1, z: 1}));
// We expect $addFields to retain the position of pre-existing fields, and then append new fields in
// the order that they are specified in the query. This rule should not be impacted by the presence
// of a preceding exclusion projection.
assert.eq(
[
{_id: 1, x: 3, y: 4, b: 5, c: 6, a: 7},
// Here "c" retains the position that it had prior to being excluded.
{_id: 2, c: 6, x: 3, y: 4, b: 5, a: 7},
{_id: 3, y: 4, z: 1, x: 3, b: 5, c: 6, a: 7}
],
coll.aggregate([
{$project: {b: 0, c: 0}},
{$addFields: {x: 3, y: 4, b: 5, c: 6, a: 7}},
{$sort: {_id: 1}}
])
.toArray());
}());
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