feat: add _extracted suffix to detected fields conflicts (grafana#13993)

Author: trevorwhitney

pkg/querier/querier.go

@@ -1199,6 +1199,11 @@ func parseDetectedFields(limit uint32, streams logqlmodel.Streams) map[string]*p
 	emtpyparser := ""
 
 	for _, stream := range streams {
+		streamLbls, err := syntax.ParseLabels(stream.Labels)
+		if err != nil {
+			streamLbls = labels.EmptyLabels()
+		}
+
 		for _, entry := range stream.Entries {
 			structuredMetadata := getStructuredMetadata(entry)
 			for k, vals := range structuredMetadata {
@@ -1226,7 +1231,7 @@ func parseDetectedFields(limit uint32, streams logqlmodel.Streams) map[string]*p
 				}
 			}
 
-			detected, parser := parseLine(entry.Line)
+			detected, parser := parseLine(entry.Line, streamLbls)
 			for k, vals := range detected {
 				df, ok := detectedFields[k]
 				if !ok && fieldCount < limit {
@@ -1283,11 +1288,11 @@ func getStructuredMetadata(entry push.Entry) map[string][]string {
 	return result
 }
 
-func parseLine(line string) (map[string][]string, *string) {
+func parseLine(line string, streamLbls labels.Labels) (map[string][]string, *string) {
 	parser := "logfmt"
 	logFmtParser := logql_log.NewLogfmtParser(true, false)
 
-	lbls := logql_log.NewBaseLabelsBuilder().ForLabels(labels.EmptyLabels(), 0)
+	lbls := logql_log.NewBaseLabelsBuilder().ForLabels(streamLbls, 0)
 	_, logfmtSuccess := logFmtParser.Process(0, []byte(line), lbls)
 	if !logfmtSuccess || lbls.HasErr() {
 		parser = "json"
@@ -1301,6 +1306,10 @@ func parseLine(line string) (map[string][]string, *string) {
 
 	parsedLabels := map[string]map[string]struct{}{}
 	for _, lbl := range lbls.LabelsResult().Labels() {
+		// skip indexed labels, as we only want detected fields
+		if streamLbls.Has(lbl.Name) {
+			continue
+		}
 		if values, ok := parsedLabels[lbl.Name]; ok {
 			values[lbl.Value] = struct{}{}
 		} else {

pkg/querier/querier_mock_test.go

@@ -575,7 +575,7 @@ func mockStreamWithLabels(from int, quantity int, labels string) logproto.Stream
 }
 
 func mockLogfmtStream(from int, quantity int) logproto.Stream {
-	return mockLogfmtStreamWithLabels(from, quantity, `{type="test"}`)
+	return mockLogfmtStreamWithLabels(from, quantity, `{type="test", name="foo"}`)
 }
 
 func mockLogfmtStreamWithLabels(_ int, quantity int, labels string) logproto.Stream {
@@ -586,7 +586,7 @@ func mockLogfmtStreamWithLabels(_ int, quantity int, labels string) logproto.Str
 		entries = append(entries, logproto.Entry{
 			Timestamp: time.Unix(int64(i), 0),
 			Line: fmt.Sprintf(
-				`message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t`,
+				`message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t name=bar`,
 				i,
 				i,
 				(i * 10),

pkg/querier/querier_test.go

@@ -1777,15 +1777,16 @@ func TestQuerier_DetectedFields(t *testing.T) {
 		detectedFields := resp.Fields
 		// log lines come from querier_mock_test.go
 		// message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t
-		assert.Len(t, detectedFields, 7)
+		assert.Len(t, detectedFields, 8)
 		expectedCardinality := map[string]uint64{
-			"message":  5,
-			"count":    5,
-			"fake":     1,
-			"bytes":    5,
-			"duration": 5,
-			"percent":  5,
-			"even":     2,
+			"message":        5,
+			"count":          5,
+			"fake":           1,
+			"bytes":          5,
+			"duration":       5,
+			"percent":        5,
+			"even":           2,
+			"name_extracted": 1,
 		}
 		for _, d := range detectedFields {
 			card := expectedCardinality[d.Label]
@@ -1821,17 +1822,18 @@ func TestQuerier_DetectedFields(t *testing.T) {
 		detectedFields := resp.Fields
 		// log lines come from querier_mock_test.go
 		// message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t
-		assert.Len(t, detectedFields, 9)
+		assert.Len(t, detectedFields, 10)
 		expectedCardinality := map[string]uint64{
-			"variable": 5,
-			"constant": 1,
-			"message":  5,
-			"count":    5,
-			"fake":     1,
-			"bytes":    5,
-			"duration": 5,
-			"percent":  5,
-			"even":     2,
+			"variable":       5,
+			"constant":       1,
+			"message":        5,
+			"count":          5,
+			"fake":           1,
+			"bytes":          5,
+			"duration":       5,
+			"percent":        5,
+			"even":           2,
+			"name_extracted": 1,
 		}
 		for _, d := range detectedFields {
 			card := expectedCardinality[d.Label]
@@ -1867,7 +1869,7 @@ func TestQuerier_DetectedFields(t *testing.T) {
 		detectedFields := resp.Fields
 		// log lines come from querier_mock_test.go
 		// message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t
-		assert.Len(t, detectedFields, 7)
+		assert.Len(t, detectedFields, 8)
 
 		var messageField, countField, bytesField, durationField, floatField, evenField *logproto.DetectedField
 		for _, field := range detectedFields {
@@ -1923,7 +1925,7 @@ func TestQuerier_DetectedFields(t *testing.T) {
 		detectedFields := resp.Fields
 		// log lines come from querier_mock_test.go
 		// message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t
-		assert.Len(t, detectedFields, 9)
+		assert.Len(t, detectedFields, 10)
 
 		var messageField, countField, bytesField, durationField, floatField, evenField, constantField, variableField *logproto.DetectedField
 		for _, field := range detectedFields {
@@ -1955,7 +1957,56 @@ func TestQuerier_DetectedFields(t *testing.T) {
 		assert.Equal(t, []string{"logfmt"}, evenField.Parsers)
 		assert.Equal(t, []string{""}, constantField.Parsers)
 		assert.Equal(t, []string{""}, variableField.Parsers)
-	})
+	},
+	)
+
+	t.Run(
+		"adds _extracted suffix to detected fields that conflict with indexed labels",
+		func(t *testing.T) {
+			store := newStoreMock()
+			store.On("SelectLogs", mock.Anything, mock.Anything).
+				Return(mockLogfmtStreamIterator(1, 2), nil)
+
+			queryClient := newQueryClientMock()
+			queryClient.On("Recv").
+				Return(mockQueryResponse([]logproto.Stream{mockLogfmtStreamWithStructuredMetadata(1, 2)}), nil)
+
+			ingesterClient := newQuerierClientMock()
+			ingesterClient.On("Query", mock.Anything, mock.Anything, mock.Anything).
+				Return(queryClient, nil)
+
+			querier, err := newQuerier(
+				conf,
+				mockIngesterClientConfig(),
+				newIngesterClientMockFactory(ingesterClient),
+				mockReadRingWithOneActiveIngester(),
+				&mockDeleteGettter{},
+				store, limits)
+			require.NoError(t, err)
+
+			resp, err := querier.DetectedFields(ctx, &request)
+			require.NoError(t, err)
+
+			detectedFields := resp.Fields
+			// log lines come from querier_mock_test.go
+			// message="line %d" count=%d fake=true bytes=%dMB duration=%dms percent=%f even=%t
+			assert.Len(t, detectedFields, 10)
+
+			var nameField *logproto.DetectedField
+			for _, field := range detectedFields {
+				switch field.Label {
+				case "name_extracted":
+					nameField = field
+				}
+			}
+
+			assert.NotNil(t, nameField)
+			assert.Equal(t, "name_extracted", nameField.Label)
+			assert.Equal(t, logproto.DetectedFieldString, nameField.Type)
+			assert.Equal(t, []string{"logfmt"}, nameField.Parsers)
+			assert.Equal(t, uint64(1), nameField.Cardinality)
+		},
+	)
 }
 
 func BenchmarkQuerierDetectedFields(b *testing.B) {