/**
 * 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 _OB_EXPR_LNNVL_H
#define _OB_EXPR_LNNVL_H

#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase {
namespace sql {
class ObExprFuncLnnvl : public ObFuncExprOperator {
public:
  explicit ObExprFuncLnnvl(common::ObIAllocator& alloc);
  virtual ~ObExprFuncLnnvl();
  virtual int calc_result1(common::ObObj& result, const common::ObObj& input, common::ObExprCtx& expr_ctx) const override;
  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const override;
  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;

  static int eval_lnnvl(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);

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

inline int ObExprFuncLnnvl::calc_result_type1(
    ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const
{
  UNUSED(type_ctx);
  UNUSED(type1);
  type.set_tinyint();
  type.set_scale(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObTinyIntType].scale_);
  type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObTinyIntType].precision_);
  type1.set_calc_type(common::ObTinyIntType);
  return common::OB_SUCCESS;
}

}  // namespace sql
}  // namespace oceanbase
#endif /*OB_SQL_EXPR_FUNC_END*/
