Add SQL function for creating an array

sql/funcs.go

@@ -98,6 +98,7 @@ var aggrs = map[string]bool{
 
 var funcs = map[string]map[int]interface{}{
 
+	"array":      {-1: nil},
 	"batch":      {2: nil},
 	"binary":     {1: nil},
 	"difference": {-1: nil},

util/fncs/array.go

@@ -0,0 +1,27 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fncs
+
+import (
+	"context"
+)
+
+func array(ctx context.Context, args ...interface{}) ([]interface{}, error) {
+	out := make([]interface{}, len(args))
+	for i, arg := range args {
+		out[i] = arg
+	}
+	return out, nil
+}

util/fncs/array_test.go

@@ -0,0 +1,39 @@
+// Copyright © 2016 Abcum Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package fncs
+
+import (
+	"time"
+
+	"context"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestArray(t *testing.T) {
+
+	var res interface{}
+
+	timer := time.Now()
+
+	Convey("array() works properly", t, func() {
+		res, _ = Run(context.Background(), "array", 1, 2, 3)
+		So(res, ShouldResemble, []interface{}{1, 2, 3})
+		res, _ = Run(context.Background(), "array", nil, true, "test", timer)
+		So(res, ShouldResemble, []interface{}{nil, true, "test", timer})
+	})
+
+}

util/fncs/fnc.go

@@ -20,6 +20,8 @@ func Run(ctx context.Context, name string, args ...interface{}) (interface{}, er
 
 	switch name {
 
+	case "array":
+		return array(ctx, args...)
 	case "batch":
 		return batch(ctx, args...)
 	case "difference":