Remove unused code

core/pkg/source/querygroup.go

@@ -70,44 +70,3 @@ func (qgar *QueryGroupAsyncResult) Await() ([]*QueryResult, error) {
 
 	return result.Results, nil
 }
-
-/*
-type QueryResultCollection []*QueryResults
-
-func (qrc *QueryResultCollection) HasErrors() bool {
-	for _, qr := range *qrc {
-		if qr.Error != nil {
-			return true
-		}
-	}
-	return false
-}
-
-func (qrc *QueryResultCollection) Error() error {
-	var errCollection QueryErrorCollector
-
-	for _, qr := range *qrc {
-		q := qr.Query
-		e := qr.Error
-
-		if e != nil {
-			if IsErrorCollection(e) {
-				if errs, ok := e.(QueryErrorCollection); ok {
-					for _, qErr := range errs.Errors() {
-						errCollection.AppendError(qErr)
-					}
-					for _, qWarn := range errs.Warnings() {
-						errCollection.AppendWarning(qWarn)
-					}
-				} else {
-					errCollection.AppendError(&QueryError{Query: q, Error: e})
-				}
-			} else {
-				errCollection.AppendError(&QueryError{Query: q, Error: e})
-			}
-		}
-	}
-
-	return &errCollection
-}
-*/