Don't cut off subsecond precision for postgres macros

Change time format to RFC3339Nano for $__timeFilter, $__timeFrom and
$__timeTo macros

pkg/tsdb/postgres/macros.go

@@ -86,11 +86,11 @@ func (m *postgresMacroEngine) evaluateMacro(name string, args []string) (string,
 			return "", fmt.Errorf("missing time column argument for macro %v", name)
 		}
 
-		return fmt.Sprintf("%s BETWEEN '%s' AND '%s'", args[0], m.timeRange.GetFromAsTimeUTC().Format(time.RFC3339), m.timeRange.GetToAsTimeUTC().Format(time.RFC3339)), nil
+		return fmt.Sprintf("%s BETWEEN '%s' AND '%s'", args[0], m.timeRange.GetFromAsTimeUTC().Format(time.RFC3339Nano), m.timeRange.GetToAsTimeUTC().Format(time.RFC3339Nano)), nil
 	case "__timeFrom":
-		return fmt.Sprintf("'%s'", m.timeRange.GetFromAsTimeUTC().Format(time.RFC3339)), nil
+		return fmt.Sprintf("'%s'", m.timeRange.GetFromAsTimeUTC().Format(time.RFC3339Nano)), nil
 	case "__timeTo":
-		return fmt.Sprintf("'%s'", m.timeRange.GetToAsTimeUTC().Format(time.RFC3339)), nil
+		return fmt.Sprintf("'%s'", m.timeRange.GetToAsTimeUTC().Format(time.RFC3339Nano)), nil
 	case "__timeGroup":
 		if len(args) < 2 {
 			return "", fmt.Errorf("macro %v needs time column and interval and optional fill value", name)

pkg/tsdb/postgres/macros_test.go

@@ -41,7 +41,7 @@ func TestMacroEngine(t *testing.T) {
 				sql, err := engine.Interpolate(query, timeRange, "WHERE $__timeFilter(time_column)")
 				So(err, ShouldBeNil)
 
-				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339), to.Format(time.RFC3339)))
+				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339Nano), to.Format(time.RFC3339Nano)))
 			})
 
 			Convey("interpolate __timeFrom function", func() {
@@ -138,7 +138,7 @@ func TestMacroEngine(t *testing.T) {
 				sql, err := engine.Interpolate(query, timeRange, "WHERE $__timeFilter(time_column)")
 				So(err, ShouldBeNil)
 
-				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339), to.Format(time.RFC3339)))
+				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339Nano), to.Format(time.RFC3339Nano)))
 			})
 
 			Convey("interpolate __unixEpochFilter function", func() {
@@ -158,7 +158,7 @@ func TestMacroEngine(t *testing.T) {
 				sql, err := engine.Interpolate(query, timeRange, "WHERE $__timeFilter(time_column)")
 				So(err, ShouldBeNil)
 
-				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339), to.Format(time.RFC3339)))
+				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339Nano), to.Format(time.RFC3339Nano)))
 			})
 
 			Convey("interpolate __unixEpochFilter function", func() {
@@ -168,5 +168,22 @@ func TestMacroEngine(t *testing.T) {
 				So(sql, ShouldEqual, fmt.Sprintf("select time >= %d AND time <= %d", from.Unix(), to.Unix()))
 			})
 		})
+
+		Convey("Given a time range between 1960-02-01 07:00:00.5 and 1980-02-03 08:00:00.5", func() {
+			from := time.Date(1960, 2, 1, 7, 0, 0, 500e6, time.UTC)
+			to := time.Date(1980, 2, 3, 8, 0, 0, 500e6, time.UTC)
+			timeRange := tsdb.NewTimeRange(strconv.FormatInt(from.UnixNano()/int64(time.Millisecond), 10), strconv.FormatInt(to.UnixNano()/int64(time.Millisecond), 10))
+
+			So(from.Format(time.RFC3339Nano), ShouldEqual, "1960-02-01T07:00:00.5Z")
+			So(to.Format(time.RFC3339Nano), ShouldEqual, "1980-02-03T08:00:00.5Z")
+			Convey("interpolate __timeFilter function", func() {
+				sql, err := engine.Interpolate(query, timeRange, "WHERE $__timeFilter(time_column)")
+				So(err, ShouldBeNil)
+
+				So(sql, ShouldEqual, fmt.Sprintf("WHERE time_column BETWEEN '%s' AND '%s'", from.Format(time.RFC3339Nano), to.Format(time.RFC3339Nano)))
+			})
+
+		})
+
 	})
 }