adding maxQueryCommentMetadata to Class struct

Author: yashmaheshwari

class.go

@@ -21,9 +21,11 @@ type Class struct {
 	UniqueQueries uint     // unique number of queries in class
 	Example       *Example `json:",omitempty"` // sample query with max Query_time
 	// --
-	outliers uint64
-	lastDb   string
-	sample   bool
+	outliers                uint64
+	lastDb                  string
+	sample                  bool
+	maxQueryTime            float64
+	maxQueryCommentMetadata map[string]string
 }
 
 // A Example is a real query and its database, timestamp, and Query_time.
@@ -40,12 +42,14 @@ type Example struct {
 // If sample is true, the query with the greatest Query_time is saved.
 func NewClass(id, fingerprint string, sample bool) *Class {
 	return &Class{
-		Id:           id,
-		Fingerprint:  fingerprint,
-		Metrics:      NewMetrics(),
-		TotalQueries: 0,
-		Example:      &Example{},
-		sample:       sample,
+		Id:                      id,
+		Fingerprint:             fingerprint,
+		Metrics:                 NewMetrics(),
+		TotalQueries:            0,
+		Example:                 &Example{},
+		sample:                  sample,
+		maxQueryTime:            0,
+		maxQueryCommentMetadata: map[string]string{},
 	}
 }
 
@@ -82,6 +86,13 @@ func (c *Class) AddEvent(e Event, outlier bool) {
 			}
 		}
 	}
+
+	if queryTime, ok := e.TimeMetrics["Query_time"]; ok {
+		if queryTime > c.maxQueryTime {
+			c.maxQueryCommentMetadata = e.CommentMetadata
+		}
+	}
+
 }
 
 // Finalize calculates all metric statistics. Call this function when done

metrics.go

@@ -14,7 +14,6 @@ type Metrics struct {
 	TimeMetrics   map[string]*TimeStats   `json:",omitempty"`
 	NumberMetrics map[string]*NumberStats `json:",omitempty"`
 	BoolMetrics   map[string]*BoolStats   `json:",omitempty"`
-	//	TODO(Yash): Add another metrics for metadata.
 }
 
 // TimeStats are microsecond-based metrics like Query_time and Lock_time.
@@ -27,8 +26,6 @@ type TimeStats struct {
 	P95        float64 `json:",omitempty"` // 95th percentile
 	Max        float64 `json:",omitempty"`
 	outlierSum float64
-	//	TODO(Yash) timeTakeToTraceId as map.  Move this to Metrics class or create another struct parallel to TImeMetrics, NumberMetrics, BoolMetrics
-	//	traceIdOfMaxSql
 }
 
 // NumberStats are integer-based metrics like Rows_sent and Merge_passes.
@@ -75,7 +72,6 @@ func (m *Metrics) AddEvent(e Event, outlier bool) {
 			stats.Sum += val
 		}
 		stats.vals = append(stats.vals, float64(val))
-		//	TODO(Yash): Add traceIdProto to the map defined in TimeMetrics
 	}
 
 	for metric, val := range e.NumberMetrics {
@@ -137,7 +133,6 @@ func (m *Metrics) Finalize(rateLimit uint) {
 
 		// Update sum last because avg ^ needs the original value.
 		s.Sum = (s.Sum * float64(rateLimit)) + s.outlierSum
-		//TODO(Yash): Do timeTakenToTraceIdProto[s.Max] to know the traceId and populate traceIdOfMaxSql
 	}
 
 	for _, s := range m.NumberMetrics {