/**
 * 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_GET_PACKAGE_VAR_H
#define _OB_EXPR_GET_PACKAGE_VAR_H 1

namespace oceanbase
{
}

#endif /* _OB_EXPR_GET_PACKAGE_VAR_H */

// Copyright 2014-2017 Alibaba Inc. All Rights Reserved.
// Author:
#ifndef SRC_SQL_ENGINE_EXPR_OB_EXPR_GET_PACKAGE_VAR_H_
#define SRC_SQL_ENGINE_EXPR_OB_EXPR_GET_PACKAGE_VAR_H_
#include "lib/ob_name_def.h"
#include "sql/engine/expr/ob_expr_operator.h"
#include "sql/session/ob_sql_session_info.h"

namespace oceanbase
{
namespace sql
{
class ObExprGetPackageVar : public ObFuncExprOperator
{
public:
  explicit ObExprGetPackageVar(common::ObIAllocator &alloc)
  : ObFuncExprOperator(alloc, T_OP_GET_PACKAGE_VAR, N_GET_PACKAGE_VAR, PARAM_NUM_UNKNOWN, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION, INTERNAL_IN_MYSQL_MODE) {}

  virtual int calc_result_typeN(ObExprResType &type,
                                ObExprResType *types_stack,
                                int64_t param_num,
                                ObExprTypeCtx &type_ctx) const;

  static int eval_get_package_var(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
  virtual int cg_expr(ObExprCGCtx &ctx, const ObRawExpr &raw_expr,
                      ObExpr &rt_expr) const override;
private:
  static int calc(common::ObObj &result,
                  uint64_t package_id,
                  int64_t spec_version,
                  int64_t body_version,
                  int64_t var_idx,
                  ObExecContext *exec_ctx,
                  ObSQLSessionInfo *session_info);
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObExprGetPackageVar);
};
} //end namespace sql
} //end namespace oceanbase
#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_GET_PACKAGE_VAR_H_ */