Elevate queryer type

db/db.go

@@ -543,13 +543,14 @@ func (db *DB) Query(req *command.Request, xTime bool) ([]*command.QueryRows, err
 	return db.queryWithConn(req, xTime, conn)
 }
 
+type queryer interface {
+	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
+}
+
 func (db *DB) queryWithConn(req *command.Request, xTime bool, conn *sql.Conn) ([]*command.QueryRows, error) {
 	var err error
-	type Queryer interface {
-		QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
-	}
 
-	var queryer Queryer
+	var queryer queryer
 	var tx *sql.Tx
 	if req.Transaction {
 		stats.Add(numQTx, 1)
@@ -621,10 +622,6 @@ func (db *DB) queryWithConn(req *command.Request, xTime bool, conn *sql.Conn) ([
 	return allRows, err
 }
 
-type queryer interface {
-	QueryContext(ctx context.Context, query string, args ...interface{}) (*sql.Rows, error)
-}
-
 func (db *DB) queryStmtWithConn(stmt *command.Statement, xTime bool, q queryer) (*command.QueryRows, error) {
 	rows := &command.QueryRows{}
 	start := time.Now()