app/vmselect/promql: reset timeseries name on group_left and group_right as Prometheus does

app/vmselect/promql/binary_op.go

@@ -322,6 +322,7 @@ func adjustBinaryOpTags(be *binaryOpExpr, left, right []*timeseries) ([]*timeser
 			}
 			src := tssRight[0]
 			for _, ts := range tssLeft {
+				resetMetricGroupIfRequired(be, ts)
 				ts.MetricName.AddMissingTags(joinTags, &src.MetricName)
 				rvsLeft = append(rvsLeft, ts)
 				rvsRight = append(rvsRight, src)
@@ -332,6 +333,7 @@ func adjustBinaryOpTags(be *binaryOpExpr, left, right []*timeseries) ([]*timeser
 			}
 			src := tssLeft[0]
 			for _, ts := range tssRight {
+				resetMetricGroupIfRequired(be, ts)
 				ts.MetricName.AddMissingTags(joinTags, &src.MetricName)
 				rvsLeft = append(rvsLeft, src)
 				rvsRight = append(rvsRight, ts)

app/vmselect/promql/exec_test.go

@@ -1869,9 +1869,9 @@ func TestExecSuccess(t *testing.T) {
 		resultExpected := []netstorage.Result{r}
 		f(q, resultExpected)
 	})
-	t.Run(`vector * on(foo) group_left() duplicate_timeseries`, func(t *testing.T) {
+	t.Run(`vector * on(foo) group_left() duplicate_nonoverlapping_timeseries`, func(t *testing.T) {
 		t.Parallel()
-		q := `label_set(time()/10, "foo", "bar") + on(foo) group_left() (
+		q := `label_set(time()/10, "foo", "bar", "xx", "yy", "__name__", "qwert") + on(foo) group_left() (
 			label_set(time() < 1400, "foo", "bar", "op", "le"),
 			label_set(time() >= 1400, "foo", "bar", "op", "ge"),
 		)`
@@ -1880,13 +1880,85 @@ func TestExecSuccess(t *testing.T) {
 			Values:     []float64{1100, 1320, 1540, 1760, 1980, 2200},
 			Timestamps: timestampsExpected,
 		}
-		r1.MetricName.Tags = []storage.Tag{{
+		r1.MetricName.Tags = []storage.Tag{
-			Key:   []byte("foo"),
+			{
-			Value: []byte("bar"),
+				Key:   []byte("foo"),
-		}}
+				Value: []byte("bar"),
+			},
+			{
+				Key:   []byte("xx"),
+				Value: []byte("yy"),
+			},
+		}
 		resultExpected := []netstorage.Result{r1}
 		f(q, resultExpected)
 	})
+	t.Run(`vector * on(foo) group_left(__name__)`, func(t *testing.T) {
+		t.Parallel()
+		q := `label_set(time()/10, "foo", "bar", "xx", "yy", "__name__", "qwert") + on(foo) group_left(__name__)
+			label_set(time(), "foo", "bar", "__name__", "aaa")`
+		r1 := netstorage.Result{
+			MetricName: metricNameExpected,
+			Values:     []float64{1100, 1320, 1540, 1760, 1980, 2200},
+			Timestamps: timestampsExpected,
+		}
+		r1.MetricName.MetricGroup = []byte("aaa")
+		r1.MetricName.Tags = []storage.Tag{
+			{
+				Key:   []byte("foo"),
+				Value: []byte("bar"),
+			},
+			{
+				Key:   []byte("xx"),
+				Value: []byte("yy"),
+			},
+		}
+		resultExpected := []netstorage.Result{r1}
+		f(q, resultExpected)
+	})
+	t.Run(`vector * on(foo) group_right()`, func(t *testing.T) {
+		t.Parallel()
+		q := `sort(label_set(time()/10, "foo", "bar", "xx", "yy", "__name__", "qwert") + on(foo) group_right(xx) (
+			label_set(time(), "foo", "bar", "__name__", "aaa"),
+			label_set(time()+3, "foo", "bar", "__name__", "yyy","ppp", "123"),
+		))`
+		r1 := netstorage.Result{
+			MetricName: metricNameExpected,
+			Values:     []float64{1100, 1320, 1540, 1760, 1980, 2200},
+			Timestamps: timestampsExpected,
+		}
+		r1.MetricName.Tags = []storage.Tag{
+			{
+				Key:   []byte("foo"),
+				Value: []byte("bar"),
+			},
+			{
+				Key:   []byte("xx"),
+				Value: []byte("yy"),
+			},
+		}
+		r2 := netstorage.Result{
+			MetricName: metricNameExpected,
+			Values:     []float64{1103, 1323, 1543, 1763, 1983, 2203},
+			Timestamps: timestampsExpected,
+		}
+		r2.MetricName.Tags = []storage.Tag{
+			{
+				Key:   []byte("foo"),
+				Value: []byte("bar"),
+			},
+			{
+				Key:   []byte("ppp"),
+				Value: []byte("123"),
+			},
+			{
+				Key:   []byte("xx"),
+				Value: []byte("yy"),
+			},
+		}
+		resultExpected := []netstorage.Result{r1, r2}
+		f(q, resultExpected)
+	})
 	t.Run(`vector * on() group_left scalar`, func(t *testing.T) {
 		t.Parallel()
 		q := `sort_desc((label_set(time(), "foo", "bar") or label_set(10, "foo", "qwert")) * on() group_left 2)`