reformat source code

according to code styles, 'AccessModifierOffset' should be -2.

src/sql/resolver/cmd/ob_empty_query_stmt.h

@@ -18,14 +18,14 @@
 namespace oceanbase {
 namespace sql {
 class ObEmptyQueryStmt : public ObCMDStmt {
-  public:
+public:
   ObEmptyQueryStmt() : ObCMDStmt(stmt::T_EMPTY_QUERY)
   {}
 
   virtual ~ObEmptyQueryStmt()
   {}
 
-  private:
+private:
   DISALLOW_COPY_AND_ASSIGN(ObEmptyQueryStmt);
 };