text: /**
   * 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_LOG_UNPIVOT_H_
  #define _OB_LOG_UNPIVOT_H_
  #include "sql/optimizer/ob_logical_operator.h"
  #include "sql/resolver/dml/ob_dml_stmt.h"
  
  namespace oceanbase {
  namespace sql {
  class ObLogUnpivot : public ObLogicalOperator {
  public:
    ObLogUnpivot(ObLogPlan& plan)
        : ObLogicalOperator(plan), subquery_id_(common::OB_INVALID_ID), subquery_name_(), access_exprs_()
    {}
  
    ~ObLogUnpivot()
    {}
  
    virtual int copy_without_child(ObLogicalOperator*& out);
    virtual int allocate_expr_post(ObAllocExprContext& ctx);
    virtual int print_my_plan_annotation(char* buf, int64_t& buf_len, int64_t& pos, ExplainType type);
    int allocate_exchange_post(AllocExchContext* ctx) override;
  
    int calc_cost();
    virtual int est_cost() override;
    virtual int re_est_cost(const ObLogicalOperator* parent, double need_row_count, bool& re_est) override;
    int gen_filters();
    int gen_output_columns();
    int set_properties();
    void set_subquery_id(uint64_t subquery_id)
    {
      subquery_id_ = subquery_id;
    }
    inline const uint64_t& get_subquery_id() const
    {
      return subquery_id_;
    }
    inline common::ObString& get_subquery_name()
    {
      return subquery_name_;
    }
    inline const common::ObIArray<ObRawExpr*>& get_access_exprs() const
    {
      return access_exprs_;
    }
    inline common::ObIArray<ObRawExpr*>& get_access_exprs()
    {
      return access_exprs_;
    }
    virtual int transmit_op_ordering();
    virtual int transmit_local_ordering();
  
    virtual int compute_op_ordering() override;
    virtual int compute_fd_item_set() override;
    virtual int compute_one_row_info() override;
  
  public:
    uint64_t subquery_id_;
    common::ObString subquery_name_;
    common::ObArray<ObRawExpr*, common::ModulePageAllocator, true> access_exprs_;
    ObUnpivotInfo unpivot_info_;
  
  private:
    DISALLOW_COPY_AND_ASSIGN(ObLogUnpivot);
  };
  
  }  // end of namespace sql
  }  // end of namespace oceanbase
  
  #endif /* OB_LOG_SUBQUERY_SCAN_H_ */
  