reformat source code

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

src/sql/engine/expr/ob_expr_elt.h

@@ -19,7 +19,7 @@
 namespace oceanbase {
 namespace sql {
 class ObExprElt : public ObExprOperator {
-  public:
+public:
   explicit ObExprElt(common::ObIAllocator& alloc);
   virtual ~ObExprElt(){};
 
@@ -35,7 +35,7 @@ class ObExprElt : public ObExprOperator {
   virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
   static int eval_elt(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
 
-  private:
+private:
   DISALLOW_COPY_AND_ASSIGN(ObExprElt);
 };