CloudWatch/Logs: Don't group dataframes for non time series queries for non live path (#38915)

* Use the same grouping function in legacy code

* Add error propagation

* Fix tests

* Fix tests

pkg/tests/api/metrics/api_metrics_test.go

@@ -129,9 +129,6 @@ func TestQueryCloudWatchLogs(t *testing.T) {
 				Fields: []*data.Field{
 					data.NewField("logGroupName", nil, []*string{}),
 				},
-				Meta: &data.FrameMeta{
-					PreferredVisualization: "logs",
-				},
 			},
 		}
 

pkg/tsdb/cloudwatch/log_actions.go

@@ -35,36 +35,12 @@ func (e *cloudWatchExecutor) executeLogActions(ctx context.Context, req *backend
 				return err
 			}
 
-			// When a query of the form "stats ... by ..." is made, we want to return
+			groupedFrames, err := groupResponseFrame(dataframe, model.Get("statsGroups").MustStringArray())
-			// one series per group defined in the query, but due to the format
+			if err != nil {
-			// the query response is in, there does not seem to be a way to tell
+				return err
-			// by the response alone if/how the results should be grouped.
-			// Because of this, if the frontend sees that a "stats ... by ..." query is being made
-			// the "statsGroups" parameter is sent along with the query to the backend so that we
-			// can correctly group the CloudWatch logs response.
-			statsGroups := model.Get("statsGroups").MustStringArray()
-			if len(statsGroups) > 0 && len(dataframe.Fields) > 0 {
-				groupedFrames, err := groupResults(dataframe, statsGroups)
-				if err != nil {
-					return err
-				}
-
-				resultChan <- backend.Responses{
-					query.RefID: backend.DataResponse{Frames: groupedFrames},
-				}
-				return nil
 			}
-
-			if dataframe.Meta != nil {
-				dataframe.Meta.PreferredVisualization = "logs"
-			} else {
-				dataframe.Meta = &data.FrameMeta{
-					PreferredVisualization: "logs",
-				}
-			}
-
 			resultChan <- backend.Responses{
-				query.RefID: backend.DataResponse{Frames: data.Frames{dataframe}},
+				query.RefID: backend.DataResponse{Frames: groupedFrames},
 			}
 			return nil
 		})

pkg/tsdb/cloudwatch/log_actions_test.go

@@ -81,9 +81,6 @@ func TestQuery_DescribeLogGroups(t *testing.T) {
 								aws.String("group_a"), aws.String("group_b"), aws.String("group_c"),
 							}),
 						},
-						Meta: &data.FrameMeta{
-							PreferredVisualization: "logs",
-						},
 					},
 				},
 			},
@@ -142,9 +139,6 @@ func TestQuery_DescribeLogGroups(t *testing.T) {
 								aws.String("group_a"), aws.String("group_b"), aws.String("group_c"),
 							}),
 						},
-						Meta: &data.FrameMeta{
-							PreferredVisualization: "logs",
-						},
 					},
 				},
 			},
@@ -220,9 +214,6 @@ func TestQuery_GetLogGroupFields(t *testing.T) {
 				aws.Int64(100), aws.Int64(30), aws.Int64(55),
 			}),
 		},
-		Meta: &data.FrameMeta{
-			PreferredVisualization: "logs",
-		},
 	}
 	expFrame.RefID = refID
 	assert.Equal(t, &backend.QueryDataResponse{Responses: backend.Responses{
@@ -357,7 +348,6 @@ func TestQuery_StartQuery(t *testing.T) {
 			Custom: map[string]interface{}{
 				"Region": "default",
 			},
-			PreferredVisualization: "logs",
 		}
 		assert.Equal(t, &backend.QueryDataResponse{Responses: backend.Responses{
 			refID: {
@@ -431,9 +421,6 @@ func TestQuery_StopQuery(t *testing.T) {
 		Fields: []*data.Field{
 			data.NewField("success", nil, []bool{true}),
 		},
-		Meta: &data.FrameMeta{
-			PreferredVisualization: "logs",
-		},
 	}
 	assert.Equal(t, &backend.QueryDataResponse{Responses: backend.Responses{
 		"": {