Merge pull request #12891 from svenklemm/unixepochgroup

add $__unixEpochGroup and $__unixEpochGroupAlias to sql datasources

pkg/tsdb/postgres/macros.go

@@ -140,6 +140,27 @@ func (m *postgresMacroEngine) evaluateMacro(name string, args []string) (string,
 		return fmt.Sprintf("%d", m.timeRange.GetFromAsSecondsEpoch()), nil
 	case "__unixEpochTo":
 		return fmt.Sprintf("%d", m.timeRange.GetToAsSecondsEpoch()), nil
+	case "__unixEpochGroup":
+		if len(args) < 2 {
+			return "", fmt.Errorf("macro %v needs time column and interval and optional fill value", name)
+		}
+		interval, err := time.ParseDuration(strings.Trim(args[1], `'`))
+		if err != nil {
+			return "", fmt.Errorf("error parsing interval %v", args[1])
+		}
+		if len(args) == 3 {
+			err := tsdb.SetupFillmode(m.query, interval, args[2])
+			if err != nil {
+				return "", err
+			}
+		}
+		return fmt.Sprintf("floor(%s/%v)*%v", args[0], interval.Seconds(), interval.Seconds()), nil
+	case "__unixEpochGroupAlias":
+		tg, err := m.evaluateMacro("__unixEpochGroup", args)
+		if err == nil {
+			return tg + " AS \"time\"", err
+		}
+		return "", err
 	default:
 		return "", fmt.Errorf("Unknown macro %v", name)
 	}

pkg/tsdb/postgres/macros_test.go

@@ -129,6 +129,18 @@ func TestMacroEngine(t *testing.T) {
 
 				So(sql, ShouldEqual, fmt.Sprintf("select %d", to.Unix()))
 			})
+
+			Convey("interpolate __unixEpochGroup function", func() {
+
+				sql, err := engine.Interpolate(query, timeRange, "SELECT $__unixEpochGroup(time_column,'5m')")
+				So(err, ShouldBeNil)
+				sql2, err := engine.Interpolate(query, timeRange, "SELECT $__unixEpochGroupAlias(time_column,'5m')")
+				So(err, ShouldBeNil)
+
+				So(sql, ShouldEqual, "SELECT floor(time_column/300)*300")
+				So(sql2, ShouldEqual, sql+" AS \"time\"")
+			})
+
 		})
 
 		Convey("Given a time range between 1960-02-01 07:00 and 1965-02-03 08:00", func() {