support log query trace (#137)

diff --git a/log.graphqls b/log.graphqls
index 855f6db..b16474a 100644
--- a/log.graphqls
+++ b/log.graphqls
@@ -18,8 +18,9 @@
 type Logs {
     # When this field is not empty, frontend should display it in UI
     errorReason: String
-
     logs: [Log!]!
+    #For OAP internal query debugging
+    debuggingTrace: DebuggingTrace
 }
 
 # Log info
@@ -102,7 +103,7 @@
 extend type Query {
     # Return true if the current storage implementation supports fuzzy query for logs.
     supportQueryLogsByKeywords: Boolean!
-    queryLogs(condition: LogQueryCondition): Logs
+    queryLogs(condition: LogQueryCondition, debug: Boolean): Logs
 
     # Test the logs and get the results of the LAL output.
     test(requests: LogTestRequest!): LogTestResponse!