/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef _OCEANBASE_SQL_OB_EXPR_ASSIGN_H_
#define _OCEANBASE_SQL_OB_EXPR_ASSIGN_H_
#include "sql/engine/expr/ob_expr_operator.h"
#include "lib/ob_name_def.h"
namespace oceanbase {
namespace sql {
class ObExprAssign : public ObFuncExprOperator {
  public:
  explicit ObExprAssign(common::ObIAllocator& alloc);
  virtual ~ObExprAssign();
  virtual int calc_result_type2(
      ObExprResType& type, ObExprResType& key, ObExprResType& value, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result2(
      common::ObObj& result, const common::ObObj& key, const common::ObObj& value, common::ObExprCtx& expr_ctx) const;
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  static int calc(common::ObObj& result, const common::ObObj& key, const common::ObObj& value,
      sql::ObSQLSessionInfo* my_session_, common::ObCastCtx& cast_ctx);

  private:
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprAssign);
};

}  // namespace sql
}  // namespace oceanbase
#endif  //_OCEANBASE_SQL_OB_EXPR_ASSIGN_H_