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// Providing the wrong number of fields in a pipeline stage specification triggers a parsing error.
// SERVER-6861
load('jstests/aggregation/extras/utils.js');
t = db.jstests_server6861;
t.drop();
t.save({a: 1});
function assertCode(code, expression) {
assertErrorCode(t, expression, code);
}
function assertResult(result, expression) {
assert.eq(result, t.aggregate(expression).toArray());
}
// Correct number of fields.
assertResult([{a: 1}], {$project: {_id: 0, a: 1}});
// Incorrect number of fields.
assertCode(16435, {});
assertCode(16435, {$project: {_id: 0, a: 1}, $group: {_id: 0}});
assertCode(16435, {$project: {_id: 0, a: 1}, $group: {_id: 0}, $sort: {a: 1}});
// Invalid stage specification.
assertCode(16436, {$noSuchStage: {a: 1}});
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