/**
 * 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_FROM_TZ_H_
#define OCEANBASE_SQL_OB_EXPR_FROM_TZ_H_

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

namespace oceanbase {
namespace sql {
class ObExprFromTz : public ObFuncExprOperator {
public:
  explicit ObExprFromTz(common::ObIAllocator& alloc);
  virtual ~ObExprFromTz()
  {}
  virtual int calc_result_type2(
      ObExprResType& type, ObExprResType& input1, ObExprResType& input2, common::ObExprTypeCtx& type_ctx) const;
  virtual int calc_result2(common::ObObj& result, const common::ObObj& input1, const common::ObObj& input2,
      common::ObExprCtx& expr_ctx) const;

  static int eval_from_tz_val(const common::ObOTimestampData& in_ts_val, const common::ObString& tz_str,
      ObSQLSessionInfo& my_session, common::ObOTimestampData& out_ts_val);
  static int eval_from_tz(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res);
  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& expr) const override;

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

}  // namespace sql
}  // namespace oceanbase
#endif  // OCEANBASE_SQL_OB_EXPR_FROM_TZ_H_
