46 lines
1.4 KiB
C++
46 lines
1.4 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef _OB_SINGLE_CHILD_PHY_OPERATOR_H
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#define _OB_SINGLE_CHILD_PHY_OPERATOR_H 1
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#include "sql/engine/ob_phy_operator.h"
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namespace oceanbase {
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namespace sql {
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class ObSingleChildPhyOperator : public ObPhyOperator {
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public:
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explicit ObSingleChildPhyOperator(common::ObIAllocator& alloc);
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virtual ~ObSingleChildPhyOperator();
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/// set the only one child
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virtual int set_child(int32_t child_idx, ObPhyOperator& child_operator);
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/// get the only one child
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virtual ObPhyOperator* get_child(int32_t child_idx) const;
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virtual int32_t get_child_num() const
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{
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return 1;
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}
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virtual void reset();
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virtual void reuse();
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virtual int accept(ObPhyOperatorVisitor& visitor) const;
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObSingleChildPhyOperator);
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protected:
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// data members
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ObPhyOperator* child_op_;
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};
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} // end namespace sql
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} // end namespace oceanbase
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#endif /* _OB_SINGLE_CHILD_PHY_OPERATOR_H */
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