/**
 * 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_ENGINE_EXPR_OB_EXPR_DES_HEX_STR_
#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_DES_HEX_STR_

#include "common/expression/ob_expr_string_buf.h"
#include "sql/engine/expr/ob_expr_operator.h"

namespace oceanbase {
namespace sql {
class ObExprDesHexStr : public ObFuncExprOperator {
public:
  explicit ObExprDesHexStr(common::ObIAllocator& alloc);
  virtual ~ObExprDesHexStr()
  {}

  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;

  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
  static int eval_des_hex_str(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);

private:
  static int deserialize_hex_cstr(
      const char* buf, int64_t buf_len, common::ObExprStringBuf& string_buf, common::ObObj& obj);

private:
  DISALLOW_COPY_AND_ASSIGN(ObExprDesHexStr);
};
}  // namespace sql
}  // namespace oceanbase
#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_DES_HEX_STR_
