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/**
* Test the behavior of match expressions with empty field names.
* @tags: [
* assumes_read_concern_local,
* ]
*/
(function() {
"use strict";
load("jstests/aggregation/extras/utils.js");
const coll = db.field_name_empty;
coll.drop();
assert.commandWorked(coll.insertMany([
{_id: 0, "": 1},
{_id: 1, "": {"": 1}},
{_id: 2, "": {"": {"": 1}}},
{_id: 3, "": {"": {"": {"": 1}}}},
{_id: 4, "": 1, a: 1},
{_id: 5, x: 3},
{_id: 6, x: [3]},
{_id: 7, x: {"": 3}},
{_id: 8, x: {"": [3]}},
{_id: 9, x: [{"": 3}]},
{_id: 10, x: [{"": [3]}]}
]));
function runTest({filter, expected} = {}) {
const result = coll.find(filter).toArray();
assertArrayEq({actual: result, expected: expected});
}
runTest({filter: {".": 1}, expected: [{_id: 1, "": {"": 1}}]});
runTest({filter: {"..": 1}, expected: [{_id: 2, "": {"": {"": 1}}}]});
runTest({filter: {"...": 1}, expected: [{_id: 3, "": {"": {"": {"": 1}}}}]});
runTest({filter: {"": 1}, expected: [{_id: 0, "": 1}, {_id: 4, "": 1, a: 1}]});
runTest({filter: {"": 1, a: 1}, expected: [{_id: 4, "": 1, a: 1}]});
runTest({filter: {"": 1, a: 2}, expected: []});
runTest({
filter: {'x.': 3},
expected: [{_id: 6, x: [3]}, {_id: 7, x: {"": 3}}, {_id: 8, x: {"": [3]}}]
});
})();
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