Cloudwatch Logs: Make mixed type fields fallback to being strings (#63981)

* Cloudwatch Logs: make mixed type fields fallback to being strings

* addressing pr comments

pkg/tsdb/cloudwatch/log_query.go

@@ -73,9 +73,14 @@ func logsResultsToDataframes(response *cloudwatchlogs.GetQueryResultsOutput) (*d
 				timeField[i] = &parsedTime
 			} else if numericField, ok := fieldValues[*resultField.Field].([]*float64); ok {
 				parsedFloat, err := strconv.ParseFloat(*resultField.Value, 64)
+
 				if err != nil {
-					return nil, err
+					// This can happen if a field has a mix of numeric and non-numeric values.
+					// In that case, we change the field from a numeric field to a string field.
+					fieldValues[*resultField.Field] = changeToStringField(rowCount, nonEmptyRows[:i+1], *resultField.Field)
+					continue
 				}
+
 				numericField[i] = &parsedFloat
 			} else {
 				fieldValues[*resultField.Field].([]*string)[i] = resultField.Value
@@ -145,6 +150,19 @@ func logsResultsToDataframes(response *cloudwatchlogs.GetQueryResultsOutput) (*d
 	return frame, nil
 }
 
+func changeToStringField(lengthOfValues int, rows [][]*cloudwatchlogs.ResultField, logEventField string) []*string {
+	fieldValuesAsStrings := make([]*string, lengthOfValues)
+	for i, resultFields := range rows {
+		for _, field := range resultFields {
+			if *field.Field == logEventField {
+				fieldValuesAsStrings[i] = field.Value
+			}
+		}
+	}
+
+	return fieldValuesAsStrings
+}
+
 func groupResults(results *data.Frame, groupingFieldNames []string) ([]*data.Frame, error) {
 	groupingFields := make([]*data.Field, 0)
 

pkg/tsdb/cloudwatch/log_query_test.go

@@ -221,6 +221,62 @@ func TestLogsResultsToDataframes(t *testing.T) {
 	assert.ElementsMatch(t, expectedDataframe.Fields, dataframes.Fields)
 }
 
+func TestLogsResultsToDataframes_MixedTypes_NumericValuesMixedWithStringFallBackToStringValues(t *testing.T) {
+	dataframes, err := logsResultsToDataframes(&cloudwatchlogs.GetQueryResultsOutput{
+		Results: [][]*cloudwatchlogs.ResultField{
+			{
+				&cloudwatchlogs.ResultField{
+					Field: aws.String("numberOrString"),
+					Value: aws.String("-1.234"),
+				},
+			},
+			{
+				&cloudwatchlogs.ResultField{
+					Field: aws.String("numberOrString"),
+					Value: aws.String("1"),
+				},
+			},
+			{
+				&cloudwatchlogs.ResultField{
+					Field: aws.String("numberOrString"),
+					Value: aws.String("not a number"),
+				},
+			},
+			{
+				&cloudwatchlogs.ResultField{
+					Field: aws.String("numberOrString"),
+					Value: aws.String("2.000"),
+				},
+			},
+		},
+		Status: aws.String("ok"),
+	})
+	require.NoError(t, err)
+
+	expectedDataframe := &data.Frame{
+		Name: "CloudWatchLogsResponse",
+		Fields: []*data.Field{
+			data.NewField("numberOrString", nil, []*string{
+				aws.String("-1.234"),
+				aws.String("1"),
+				aws.String("not a number"),
+				aws.String("2.000"),
+			}),
+		},
+		RefID: "",
+		Meta: &data.FrameMeta{
+			Custom: map[string]interface{}{
+				"Status": "ok",
+			},
+		},
+	}
+
+	assert.Equal(t, expectedDataframe.Name, dataframes.Name)
+	assert.Equal(t, expectedDataframe.RefID, dataframes.RefID)
+	assert.Equal(t, expectedDataframe.Meta, dataframes.Meta)
+	assert.ElementsMatch(t, expectedDataframe.Fields, dataframes.Fields)
+}
+
 func TestGroupKeyGeneration(t *testing.T) {
 	logField := data.NewField("@log", data.Labels{}, []*string{
 		aws.String("fakelog-a"),