fix typo

src/sql/resolver/expr/ob_raw_expr_deduce_type.h

@@ -110,7 +110,7 @@ private:
   int add_implicit_cast_for_op_row(ObRawExpr *&child_ptr,
                                    const common::ObIArray<ObExprResType> &input_types,
                                    const ObCastMode &cast_mode);
-  // try add cast expr on subquery stmt's oubput && update column types.
+  // try add cast expr on subquery stmt's output && update column types.
   int add_implicit_cast_for_subquery(ObQueryRefRawExpr &expr,
                                      const common::ObIArray<ObExprResType> &input_types,
                                      const ObCastMode &cast_mode);

src/sql/resolver/expr/ob_raw_expr_modify_column_name.h

@@ -37,7 +37,7 @@ public:
 
   int modifyColumnName(ObRawExpr &expr);
 
-  // interface of ObRawExprVistor
+  // interface of ObRawExprVisitor
   virtual int visit(ObConstRawExpr &expr);
   virtual int visit(ObExecParamRawExpr &expr);
   virtual int visit(ObVarRawExpr &expr);

src/sql/resolver/expr/ob_raw_expr_replacer.cpp

@@ -51,7 +51,7 @@ int ObRawExprReplacer::replace(ObRawExpr *&expr)
     expr = new_expr;
     replace_happened_ = true;
   } else if (OB_FAIL(expr->preorder_accept(*this))) {
-    LOG_WARN("failed to preorder accecpt expr", K(ret));
+    LOG_WARN("failed to preorder accept expr", K(ret));
   }
   return ret;
 }

src/sql/resolver/expr/ob_raw_expr_replacer.h

@@ -26,8 +26,8 @@ namespace sql
  *    it is replaced when visit ObQueryRefRawExpr;
  * 3. the replaced expr and its children will be skipped when traverse the expr tree, for example
  *    with replace rule [{c1 -> c1+c2+1}, {c2 -> c1+c2+2}]
- *    select c1, c2 from t1 will be transfromed into select c1+c2+1, c1+c2+2 from t1
+ *    select c1, c2 from t1 will be transformed into select c1+c2+1, c1+c2+2 from t1
- *    In constrast, ObTransformUtils::replace_expr will return OB_SIZE_OVERFLOW unexpectedly;
+ *    In contrast, ObTransformUtils::replace_expr will return OB_SIZE_OVERFLOW unexpectedly;
  */
 class ObRawExprReplacer: public ObRawExprVisitor
 {
@@ -87,7 +87,7 @@ private:
   hash::ObHashMap<uint64_t, uint64_t> expr_replace_map_;
 
   bool replace_happened_;
-   //If true, skip param epxrs which are resolved as flags instead of exprs in mysql.
+   //If true, skip param exprs which are resolved as flags instead of exprs in mysql.
    //(e.g. the second param of IS expr)
   bool skip_bool_param_mysql_;
 };