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// SERVER-14872: Aggregation expression to concatenate multiple arrays into one
// For assertErrorCode.
load('jstests/aggregation/extras/utils.js');
(function() {
'use strict';
var coll = db.agg_concat_arrays_expr;
coll.drop();
assert.commandWorked(coll.insert({a: [1, 2], b: ['three'], c: [], d: [[3], 4], e: null, str: 'x'}));
// Basic concatenation.
var pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a', '$b', '$c']}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: [1, 2, 'three']}]);
// Concatenation with nested arrays.
pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a', '$d']}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: [1, 2, [3], 4]}]);
// Concatenation with 1 argument.
pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a']}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: [1, 2]}]);
// Concatenation with no arguments.
pipeline = [{$project: {_id: 0, all: {$concatArrays: []}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: []}]);
// Any nullish inputs will result in null.
pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a', '$e']}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: null}]);
pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a', '$f']}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{all: null}]);
// Error on any non-array, non-null inputs.
pipeline = [{$project: {_id: 0, all: {$concatArrays: ['$a', '$str']}}}];
assertErrorCode(coll, pipeline, 28664);
}());
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