reformat source code

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

src/sql/engine/expr/ob_expr_convert.h

@@ -17,7 +17,7 @@
 namespace oceanbase {
 namespace sql {
 class ObExprConvert : public ObFuncExprOperator {
-  public:
+public:
   explicit ObExprConvert(common::ObIAllocator& alloc);
   virtual ~ObExprConvert();
   virtual int calc_result_type2(
@@ -27,7 +27,7 @@ class ObExprConvert : public ObFuncExprOperator {
       common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const;
   virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
 
-  private:
+private:
   DISALLOW_COPY_AND_ASSIGN(ObExprConvert);
 };
 }  // namespace sql