Add support for PostgreSQL interval column

tests/postgres/main_test.go

@@ -6,14 +6,19 @@ import (
 	_ "github.com/lib/pq"
 	"github.com/pkg/profile"
 	"os"
+	"os/exec"
+	"strings"
 	"testing"
 )
 
 var db *sql.DB
+var testRoot string
 
 func TestMain(m *testing.M) {
 	defer profile.Start().Stop()
 
+	setTestRoot()
+
 	var err error
 	db, err = sql.Open("postgres", dbconfig.PostgresConnectString)
 	if err != nil {
@@ -25,3 +30,13 @@ func TestMain(m *testing.M) {
 
 	os.Exit(ret)
 }
+
+func setTestRoot() {
+	cmd := exec.Command("git", "rev-parse", "--show-toplevel")
+	byteArr, err := cmd.Output()
+	if err != nil {
+		panic(err)
+	}
+
+	testRoot = strings.TrimSpace(string(byteArr)) + "/tests/"
+}