chore: added for comparison across group by and merges debugging quantile exact

pkg/query-service/app/clickhouseReader/reader.go

@@ -385,7 +385,7 @@ func (r *ClickHouseReader) buildResourceSubQuery(tags []model.TagQueryParam, svc
 	return resourceSubQuery, nil
 }
 
-func (r *ClickHouseReader) GetServices(ctx context.Context, queryParams *model.GetServicesParams) (*[]model.ServiceItem, *model.ApiError) {
+func (r *ClickHouseReader) GetServicesOG(ctx context.Context, queryParams *model.GetServicesParams) (*[]model.ServiceItem, *model.ApiError) {
 
 	if r.indexTable == "" {
 		return nil, &model.ApiError{Typ: model.ErrorExec, Err: ErrNoIndexTable}
@@ -428,7 +428,7 @@ func (r *ClickHouseReader) GetServices(ctx context.Context, queryParams *model.G
 
 			query := fmt.Sprintf(
 				`SELECT
-					quantile(0.99)(duration_nano) as p99,
+					toFloat64(quantileExact(0.99)(duration_nano)) as p99,
 					avg(duration_nano) as avgDuration,
 					count(*) as numCalls
 				FROM %s.%s
@@ -510,6 +510,274 @@ func (r *ClickHouseReader) GetServices(ctx context.Context, queryParams *model.G
 	return &serviceItems, nil
 }
 
+func (r *ClickHouseReader) GetServices(ctx context.Context, queryParams *model.GetServicesParams) (*[]model.ServiceItem, *model.ApiError) {
+	if r.indexTable == "" {
+		return nil, &model.ApiError{Typ: model.ErrorExec, Err: ErrNoIndexTable}
+	}
+
+	topLevelOps, apiErr := r.GetTopLevelOperations(ctx, *queryParams.Start, *queryParams.End, nil)
+	if apiErr != nil {
+		return nil, apiErr
+	}
+	// Build parallel arrays for arrayZip approach
+	var ops []string
+	var svcs []string
+	serviceOperationsMap := make(map[string][]string)
+
+	for svc, opsList := range *topLevelOps {
+		// Cap operations to 1500 per service (same as original logic)
+		cappedOps := opsList[:int(math.Min(1500, float64(len(opsList))))]
+		serviceOperationsMap[svc] = cappedOps
+
+		// Add to parallel arrays
+		for _, op := range cappedOps {
+			ops = append(ops, op)
+			svcs = append(svcs, svc)
+		}
+	}
+
+	fmt.Printf("Operation pairs count: %d\n", len(ops))
+
+	// Build resource subquery for all services, but only include our target services
+	targetServices := make([]string, 0, len(*topLevelOps))
+	for svc := range *topLevelOps {
+		targetServices = append(targetServices, svc)
+	}
+	resourceSubQuery, err := r.buildResourceSubQueryForServices(queryParams.Tags, targetServices, *queryParams.Start, *queryParams.End)
+	if err != nil {
+		zap.L().Error("Error building resource subquery", zap.Error(err))
+		return nil, &model.ApiError{Typ: model.ErrorExec, Err: err}
+	}
+
+	// Build the optimized single query using arrayZip for tuple creation
+	query := fmt.Sprintf(`
+		SELECT 
+			resource_string_service$$name AS serviceName,
+			toFloat64(quantileExact(0.99)(duration_nano)) AS p99,
+			avg(duration_nano) AS avgDuration,
+			count(*) AS numCalls,
+			countIf(statusCode = 2) AS numErrors
+		FROM %s.%s
+		WHERE (name, resource_string_service$$name) IN arrayZip(@ops, @svcs)
+			AND timestamp >= @start 
+			AND timestamp <= @end
+			AND ts_bucket_start >= @start_bucket 
+			AND ts_bucket_start <= @end_bucket
+			AND (resource_fingerprint GLOBAL IN %s)
+		GROUP BY serviceName
+		ORDER BY numCalls DESC`,
+		r.TraceDB, r.traceTableName, resourceSubQuery,
+	)
+
+	args := []interface{}{
+		clickhouse.Named("start", strconv.FormatInt(queryParams.Start.UnixNano(), 10)),
+		clickhouse.Named("end", strconv.FormatInt(queryParams.End.UnixNano(), 10)),
+		clickhouse.Named("start_bucket", strconv.FormatInt(queryParams.Start.Unix()-1800, 10)),
+		clickhouse.Named("end_bucket", strconv.FormatInt(queryParams.End.Unix(), 10)),
+		// Important: wrap slices with clickhouse.Array for IN/array params
+		clickhouse.Named("ops", ops),
+		clickhouse.Named("svcs", svcs),
+	}
+
+	fmt.Printf("Query: %s\n", query)
+
+	// Execute the single optimized query
+	rows, err := r.db.Query(ctx, query, args...)
+	if err != nil {
+		zap.L().Error("Error executing optimized services query", zap.Error(err))
+		return nil, &model.ApiError{Typ: model.ErrorExec, Err: err}
+	}
+	defer rows.Close()
+
+	// Process results
+	serviceItems := []model.ServiceItem{}
+
+	for rows.Next() {
+		var serviceItem model.ServiceItem
+		err := rows.ScanStruct(&serviceItem)
+		if err != nil {
+			zap.L().Error("Error scanning service item", zap.Error(err))
+			continue
+		}
+
+		// Skip services with zero calls (match original behavior)
+		if serviceItem.NumCalls == 0 {
+			continue
+		}
+
+		// Add data warning for this service
+		if ops, exists := serviceOperationsMap[serviceItem.ServiceName]; exists {
+			serviceItem.DataWarning = model.DataWarning{
+				TopLevelOps: ops,
+			}
+		}
+
+		// Calculate derived fields
+		serviceItem.CallRate = float64(serviceItem.NumCalls) / float64(queryParams.Period)
+		if serviceItem.NumCalls > 0 {
+			serviceItem.ErrorRate = float64(serviceItem.NumErrors) * 100 / float64(serviceItem.NumCalls)
+		}
+
+		serviceItems = append(serviceItems, serviceItem)
+	}
+
+	if err = rows.Err(); err != nil {
+		zap.L().Error("Error iterating over service results", zap.Error(err))
+		return nil, &model.ApiError{Typ: model.ErrorExec, Err: err}
+	}
+
+	// Fetch results from the original GetServicesOG for comparison
+	ogResults, ogErr := r.GetServicesOG(ctx, queryParams)
+	if ogErr != nil {
+		zap.L().Error("Error fetching OG service results", zap.Error(ogErr))
+	} else {
+		// Compare the optimized results with OG results
+		ogMap := make(map[string]model.ServiceItem)
+		for _, ogItem := range *ogResults {
+			ogMap[ogItem.ServiceName] = ogItem
+		}
+
+		for _, optItem := range serviceItems {
+			if ogItem, exists := ogMap[optItem.ServiceName]; exists {
+				// Compare key fields (NumCalls, NumErrors, etc.)
+				if optItem.NumCalls != ogItem.NumCalls ||
+					optItem.NumErrors != ogItem.NumErrors ||
+					int64(optItem.Percentile99) != int64(ogItem.Percentile99) ||
+					int64(optItem.AvgDuration) != int64(ogItem.AvgDuration) {
+					fmt.Printf(
+						"[Discrepancy] Service: %s | optNumCalls: %d, ogNumCalls: %d | optNumErrors: %d, ogNumErrors: %d | optP99: %.2f, ogP99: %.2f | optAvgDuration: %.2f, ogAvgDuration: %.2f\n",
+						optItem.ServiceName,
+						optItem.NumCalls, ogItem.NumCalls,
+						optItem.NumErrors, ogItem.NumErrors,
+						optItem.Percentile99, ogItem.Percentile99,
+						optItem.AvgDuration, ogItem.AvgDuration,
+					)
+				}
+			} else {
+				zap.L().Warn("Service present in optimized results but missing in OG results",
+					zap.String("service", optItem.ServiceName))
+			}
+		}
+
+		// Check for services present in OG but missing in optimized
+		optMap := make(map[string]struct{})
+		for _, optItem := range serviceItems {
+			optMap[optItem.ServiceName] = struct{}{}
+		}
+		for _, ogItem := range *ogResults {
+			if _, exists := optMap[ogItem.ServiceName]; !exists {
+				fmt.Printf("Service present in OG results but missing in optimized results: %s\n", ogItem.ServiceName)
+			}
+		}
+	}
+
+	return &serviceItems, nil
+}
+
+// buildResourceSubQueryForServices builds a resource subquery that includes only specific services
+// This maintains service context while optimizing for multiple services in a single query
+func (r *ClickHouseReader) buildResourceSubQueryForServices(tags []model.TagQueryParam, targetServices []string, start, end time.Time) (string, error) {
+	if len(targetServices) == 0 {
+		return "", fmt.Errorf("no target services provided")
+	}
+
+	if len(tags) == 0 {
+		// For exact parity with per-service behavior, build via resource builder with only service filter
+		filterSet := v3.FilterSet{}
+		filterSet.Items = append(filterSet.Items, v3.FilterItem{
+			Key: v3.AttributeKey{
+				Key:      "service.name",
+				DataType: v3.AttributeKeyDataTypeString,
+				Type:     v3.AttributeKeyTypeResource,
+			},
+			Operator: v3.FilterOperatorIn,
+			Value:    targetServices,
+		})
+
+		resourceSubQuery, err := resource.BuildResourceSubQuery(
+			r.TraceDB,
+			r.traceResourceTableV3,
+			start.Unix()-1800,
+			end.Unix(),
+			&filterSet,
+			[]v3.AttributeKey{},
+			v3.AttributeKey{},
+			false)
+		if err != nil {
+			zap.L().Error("Error building resource subquery for services", zap.Error(err))
+			return "", err
+		}
+		return resourceSubQuery, nil
+	}
+
+	// Convert tags to filter set
+	filterSet := v3.FilterSet{}
+	for _, tag := range tags {
+		// Skip the collector id as we don't add it to traces
+		if tag.Key == "signoz.collector.id" {
+			continue
+		}
+
+		var it v3.FilterItem
+		it.Key = v3.AttributeKey{
+			Key:      tag.Key,
+			DataType: v3.AttributeKeyDataTypeString,
+			Type:     v3.AttributeKeyTypeResource,
+		}
+
+		switch tag.Operator {
+		case model.NotInOperator:
+			it.Operator = v3.FilterOperatorNotIn
+			it.Value = tag.StringValues
+		case model.InOperator:
+			it.Operator = v3.FilterOperatorIn
+			it.Value = tag.StringValues
+		default:
+			return "", fmt.Errorf("operator %s not supported", tag.Operator)
+		}
+
+		filterSet.Items = append(filterSet.Items, it)
+	}
+
+	// Add service filter to limit to our target services
+	filterSet.Items = append(filterSet.Items, v3.FilterItem{
+		Key: v3.AttributeKey{
+			Key:      "service.name",
+			DataType: v3.AttributeKeyDataTypeString,
+			Type:     v3.AttributeKeyTypeResource,
+		},
+		Operator: v3.FilterOperatorIn,
+		Value:    targetServices,
+	})
+
+	// Build resource subquery with service-specific filtering
+	resourceSubQuery, err := resource.BuildResourceSubQuery(
+		r.TraceDB,
+		r.traceResourceTableV3,
+		start.Unix()-1800,
+		end.Unix(),
+		&filterSet,
+		[]v3.AttributeKey{},
+		v3.AttributeKey{},
+		false)
+	if err != nil {
+		zap.L().Error("Error building resource subquery for services", zap.Error(err))
+		return "", err
+	}
+	return resourceSubQuery, nil
+}
+
+// buildServiceInClause creates a properly quoted IN clause for service names
+func (r *ClickHouseReader) buildServiceInClause(services []string) string {
+	var quotedServices []string
+	for _, svc := range services {
+		// Escape single quotes and wrap in quotes
+		escapedSvc := strings.ReplaceAll(svc, "'", "\\'")
+		quotedServices = append(quotedServices, fmt.Sprintf("'%s'", escapedSvc))
+	}
+	return strings.Join(quotedServices, ", ")
+}
+
 func getStatusFilters(query string, statusParams []string, excludeMap map[string]struct{}) string {
 	// status can only be two and if both are selected than they are equivalent to none selected
 	if _, ok := excludeMap["status"]; ok {
@@ -529,7 +797,6 @@ func getStatusFilters(query string, statusParams []string, excludeMap map[string
 	}
 	return query
 }
-
 func createTagQueryFromTagQueryParams(queryParams []model.TagQueryParam) []model.TagQuery {
 	tags := []model.TagQuery{}
 	for _, tag := range queryParams {
@@ -686,7 +953,6 @@ func addExistsOperator(item model.TagQuery, tagMapType string, not bool) (string
 	}
 	return fmt.Sprintf(" AND %s (%s)", notStr, strings.Join(tagOperatorPair, " OR ")), args
 }
-
 func (r *ClickHouseReader) GetEntryPointOperations(ctx context.Context, queryParams *model.GetTopOperationsParams) (*[]model.TopOperationsItem, error) {
 	// Step 1: Get top operations for the given service
 	topOps, err := r.GetTopOperations(ctx, queryParams)
@@ -755,9 +1021,9 @@ func (r *ClickHouseReader) GetTopOperations(ctx context.Context, queryParams *mo
 
 	query := fmt.Sprintf(`
 		SELECT
-			quantile(0.5)(durationNano) as p50,
-			quantile(0.95)(durationNano) as p95,
-			quantile(0.99)(durationNano) as p99,
+			toFloat64(quantileExact(0.5)(durationNano)) as p50,
+			toFloat64(quantileExact(0.95)(durationNano)) as p95,
+			toFloat64(quantileExact(0.99)(durationNano)) as p99,
 			COUNT(*) as numCalls,
 			countIf(status_code=2) as errorCount,
 			name
@@ -1239,11 +1505,11 @@ func (r *ClickHouseReader) GetDependencyGraph(ctx context.Context, queryParams *
 		SELECT
 			src as parent,
 			dest as child,
-			result[1] AS p50,
-			result[2] AS p75,
-			result[3] AS p90,
-			result[4] AS p95,
-			result[5] AS p99,
+			toFloat64(result[1]) AS p50,
+			toFloat64(result[2]) AS p75,
+			toFloat64(result[3]) AS p90,
+			toFloat64(result[4]) AS p95,
+			toFloat64(result[5]) AS p99,
 			sum(total_count) as callCount,
 			sum(total_count)/ @duration AS callRate,
 			sum(error_count)/sum(total_count) * 100 as errorRate
@@ -1275,7 +1541,6 @@ func getLocalTableName(tableName string) string {
 	return tableNameSplit[0] + "." + strings.Split(tableNameSplit[1], "distributed_")[1]
 
 }
-
 func (r *ClickHouseReader) setTTLLogs(ctx context.Context, orgID string, params *model.TTLParams) (*model.SetTTLResponseItem, *model.ApiError) {
 	// uuid is used as transaction id
 	uuidWithHyphen := uuid.New()
@@ -1416,7 +1681,6 @@ func (r *ClickHouseReader) setTTLLogs(ctx context.Context, orgID string, params
 	}(ttlPayload)
 	return &model.SetTTLResponseItem{Message: "move ttl has been successfully set up"}, nil
 }
-
 func (r *ClickHouseReader) setTTLTraces(ctx context.Context, orgID string, params *model.TTLParams) (*model.SetTTLResponseItem, *model.ApiError) {
 	// uuid is used as transaction id
 	uuidWithHyphen := uuid.New()
@@ -2057,7 +2321,6 @@ func (r *ClickHouseReader) ListErrors(ctx context.Context, queryParams *model.Li
 
 	return &getErrorResponses, nil
 }
-
 func (r *ClickHouseReader) CountErrors(ctx context.Context, queryParams *model.CountErrorsParams) (uint64, *model.ApiError) {
 
 	var errorCount uint64
@@ -2169,7 +2432,6 @@ func (r *ClickHouseReader) GetNextPrevErrorIDs(ctx context.Context, queryParams
 	return &getNextPrevErrorIDsResponse, nil
 
 }
-
 func (r *ClickHouseReader) getNextErrorID(ctx context.Context, queryParams *model.GetErrorParams) (string, time.Time, *model.ApiError) {
 
 	var getNextErrorIDReponse []model.NextPrevErrorIDsDBResponse
@@ -2830,7 +3092,6 @@ func (r *ClickHouseReader) GetMetricAttributeKeys(ctx context.Context, req *v3.F
 
 	return &response, nil
 }
-
 func (r *ClickHouseReader) GetMeterAttributeKeys(ctx context.Context, req *v3.FilterAttributeKeyRequest) (*v3.FilterAttributeKeyResponse, error) {
 	var query string
 	var err error
@@ -2905,7 +3166,6 @@ func (r *ClickHouseReader) GetMetricAttributeValues(ctx context.Context, req *v3
 
 	return &attributeValues, nil
 }
-
 func (r *ClickHouseReader) GetMetricMetadata(ctx context.Context, orgID valuer.UUID, metricName, serviceName string) (*v3.MetricMetadataResponse, error) {
 
 	unixMilli := common.PastDayRoundOff()
@@ -3577,7 +3837,6 @@ func readRow(vars []interface{}, columnNames []string, countOfNumberCols int) ([
 	}
 	return groupBy, groupAttributes, groupAttributesArray, nil
 }
-
 func readRowsForTimeSeriesResult(rows driver.Rows, vars []interface{}, columnNames []string, countOfNumberCols int) ([]*v3.Series, error) {
 	// when groupBy is applied, each combination of cartesian product
 	// of attribute values is a separate series. Each item in seriesToPoints
@@ -4373,7 +4632,6 @@ func (r *ClickHouseReader) ReadRuleStateHistoryByRuleID(
 
 	return timeline, nil
 }
-
 func (r *ClickHouseReader) ReadRuleStateHistoryTopContributorsByRuleID(
 	ctx context.Context, ruleID string, params *model.QueryRuleStateHistory) ([]model.RuleStateHistoryContributor, error) {
 	query := fmt.Sprintf(`SELECT
@@ -4962,7 +5220,6 @@ func (r *ClickHouseReader) GetActiveTimeSeriesForMetricName(ctx context.Context,
 	}
 	return timeSeries, nil
 }
-
 func (r *ClickHouseReader) ListSummaryMetrics(ctx context.Context, orgID valuer.UUID, req *metrics_explorer.SummaryListMetricsRequest) (*metrics_explorer.SummaryListMetricsResponse, *model.ApiError) {
 	var args []interface{}
 
@@ -5180,7 +5437,6 @@ func (r *ClickHouseReader) ListSummaryMetrics(ctx context.Context, orgID valuer.
 
 	return &response, nil
 }
-
 func (r *ClickHouseReader) GetMetricsTimeSeriesPercentage(ctx context.Context, req *metrics_explorer.TreeMapMetricsRequest) (*[]metrics_explorer.TreeMapResponseItem, *model.ApiError) {
 	var args []interface{}
 
@@ -5760,7 +6016,6 @@ func (r *ClickHouseReader) GetInspectMetrics(ctx context.Context, req *metrics_e
 		Series: &seriesList,
 	}, nil
 }
-
 func (r *ClickHouseReader) GetInspectMetricsFingerprints(ctx context.Context, attributes []string, req *metrics_explorer.InspectMetricsRequest) ([]string, *model.ApiError) {
 	// Build dynamic key selections and JSON extracts
 	var jsonExtracts []string
@@ -5933,7 +6188,6 @@ func (r *ClickHouseReader) CheckForLabelsInMetric(ctx context.Context, metricNam
 	}
 	return hasLE, nil
 }
-
 func (r *ClickHouseReader) GetUpdatedMetricsMetadata(ctx context.Context, orgID valuer.UUID, metricNames ...string) (map[string]*model.UpdateMetricsMetadata, *model.ApiError) {
 	cachedMetadata := make(map[string]*model.UpdateMetricsMetadata)
 	var missingMetrics []string