InfluxDB: support aggregate results (#25726)

pkg/tsdb/influxdb/flux/builder.go

@@ -91,7 +91,6 @@ func (fb *FrameBuilder) Init(metadata *query.FluxTableMetadata) error {
 				return err
 			}
 			fb.value = converter
-		case col.Name() == "_measurement":
 			fb.isTimeSeries = true
 		case isTag(col.Name()):
 			fb.labels = append(fb.labels, col.Name())
@@ -129,19 +128,31 @@ func (fb *FrameBuilder) Append(record *query.FluxRecord) error {
 		}
 
 		if fb.isTimeSeries {
-			// Series Data
-			labels := make(map[string]string)
-			for _, name := range fb.labels {
-				labels[name] = record.ValueByKey(name).(string)
+			frameName, ok := record.ValueByKey("_measurement").(string)
+			if !ok {
+				frameName = "" // empty frame name
 			}
+
 			fb.active = data.NewFrame(
-				record.Measurement(),
+				frameName,
 				data.NewFieldFromFieldType(data.FieldTypeTime, 0),
 				data.NewFieldFromFieldType(fb.value.OutputFieldType, 0),
 			)
 
 			fb.active.Fields[0].Name = "Time"
-			fb.active.Fields[1].Name = record.Field()
+			name, ok := record.ValueByKey("_field").(string)
+			if ok {
+				fb.active.Fields[1].Name = name
+			}
+
+			// set the labels
+			labels := make(map[string]string)
+			for _, name := range fb.labels {
+				val, ok := record.ValueByKey(name).(string)
+				if ok {
+					labels[name] = val
+				}
+			}
 			fb.active.Fields[1].Labels = labels
 		} else {
 			fields := make([]*data.Field, len(fb.columns))

pkg/tsdb/influxdb/flux/builder_test.go

@@ -1,30 +1,10 @@
 package flux
 
 import (
-	"regexp"
 	"testing"
 )
 
-var isField = regexp.MustCompile(`^_(time|value|measurement|field|start|stop)$`)
-
 func TestColumnIdentification(t *testing.T) {
-	t.Run("Test Field Identification", func(t *testing.T) {
-		fieldNames := []string{"_time", "_value", "_measurement", "_field", "_start", "_stop"}
-		for _, item := range fieldNames {
-			if !isField.MatchString(item) {
-				t.Fatal("Field", item, "Expected field, but got false")
-			}
-		}
-	})
-
-	t.Run("Test Not Field Identification", func(t *testing.T) {
-		fieldNames := []string{"_header", "_cpu", "_hello", "_doctor"}
-		for _, item := range fieldNames {
-			if isField.MatchString(item) {
-				t.Fatal("Field", item, "Expected NOT a field, but got true")
-			}
-		}
-	})
 
 	t.Run("Test Tag Identification", func(t *testing.T) {
 		tagNames := []string{"header", "value", "tag"}

pkg/tsdb/influxdb/flux/executor_test.go

@@ -10,6 +10,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/go-cmp/cmp"
+	"github.com/grafana/grafana-plugin-sdk-go/data"
+	"github.com/xorcare/pointer"
+
 	influxdb2 "github.com/influxdata/influxdb-client-go"
 	"github.com/influxdata/influxdb-client-go/api"
 )
@@ -152,6 +156,59 @@ func TestExecuteGrouping(t *testing.T) {
 	})
 }
 
+func TestAggregateGrouping(t *testing.T) {
+	ctx := context.Background()
+
+	t.Run("Grouping Test", func(t *testing.T) {
+		runner := &MockRunner{
+			testDataPath: "aggregate.csv",
+		}
+
+		dr := ExecuteQuery(ctx, QueryModel{MaxDataPoints: 100}, runner, 50)
+		if dr.Error != nil {
+			t.Fatal(dr.Error)
+		}
+
+		if len(dr.Frames) != 1 {
+			t.Fatal("Expected one frame")
+		}
+
+		str, _ := dr.Frames[0].StringTable(-1, -1)
+		fmt.Println(str)
+
+		// 	 `Name:
+		// Dimensions: 2 Fields by 3 Rows
+		// +-------------------------------+--------------------------+
+		// | Name: Time                    | Name:                    |
+		// | Labels:                       | Labels: host=hostname.ru |
+		// | Type: []time.Time             | Type: []*float64         |
+		// +-------------------------------+--------------------------+
+		// | 2020-06-05 12:06:00 +0000 UTC | 8.291                    |
+		// | 2020-06-05 12:07:00 +0000 UTC | 0.534                    |
+		// | 2020-06-05 12:08:00 +0000 UTC | 0.667                    |
+		// +-------------------------------+--------------------------+
+		// `
+
+		expectedFrame := data.NewFrame("",
+			data.NewField("Time", nil, []time.Time{
+				time.Date(2020, 6, 5, 12, 6, 0, 0, time.UTC),
+				time.Date(2020, 6, 5, 12, 7, 0, 0, time.UTC),
+				time.Date(2020, 6, 5, 12, 8, 0, 0, time.UTC),
+			}),
+			data.NewField("", map[string]string{"host": "hostname.ru"}, []*float64{
+				pointer.Float64(8.291),
+				pointer.Float64(0.534),
+				pointer.Float64(0.667),
+			}),
+		)
+		expectedFrame.Meta = &data.FrameMeta{}
+
+		if diff := cmp.Diff(expectedFrame, dr.Frames[0], data.FrameTestCompareOptions()...); diff != "" {
+			t.Errorf("Result mismatch (-want +got):\n%s", diff)
+		}
+	})
+}
+
 func TestBuckets(t *testing.T) {
 	ctx := context.Background()
 

pkg/tsdb/influxdb/flux/testdata/aggregate.csv

@@ -0,0 +1,7 @@
+#datatype,string,long,dateTime:RFC3339,dateTime:RFC3339,dateTime:RFC3339,string,double
+#group,false,false,true,true,false,true,false
+#default,_result,,,,,,
+,result,table,_start,_stop,_time,host,_value
+,,0,2020-06-05T12:03:27.444072266Z,2020-06-05T12:08:27.444072266Z,2020-06-05T12:06:00Z,hostname.ru,8.291
+,,0,2020-06-05T12:03:27.444072266Z,2020-06-05T12:08:27.444072266Z,2020-06-05T12:07:00Z,hostname.ru,0.534
+,,0,2020-06-05T12:03:27.444072266Z,2020-06-05T12:08:27.444072266Z,2020-06-05T12:08:00Z,hostname.ru,0.667