// Tests that adding a field that only contains metadata does not cause a segmentation fault when
// grouping on the added field.
(function() {
"use strict";

// Drop the old test collection, if any.
db.server26462.drop();

// Insert some test documents into the collection.
assert.writeOK(db.server26462.insert({"_id": 1, "title": "cakes and ale"}));
assert.writeOK(db.server26462.insert({"_id": 2, "title": "more cakes"}));
assert.writeOK(db.server26462.insert({"_id": 3, "title": "bread"}));
assert.writeOK(db.server26462.insert({"_id": 4, "title": "some cakes"}));

// Create a text index on the documents.
assert.commandWorked(db.server26462.createIndex({title: "text"}));

// Add a metadata only field in the aggregation pipeline and use that field in the $group _id.
let res = db.server26462
              .aggregate([
                  {$match: {$text: {$search: "cake"}}},
                  {$addFields: {fooScore: {$meta: "textScore"}}},
                  {$group: {_id: "$fooScore", count: {$sum: 1}}}
              ])
              .itcount();

// Assert that the command worked.
assert.eq(2, res);
})();