69 lines
1.7 KiB
C++
69 lines
1.7 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 OCEANBASE_BASIC_OB_COUNT_OP_H_
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#define OCEANBASE_BASIC_OB_COUNT_OP_H_
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#include "sql/engine/ob_operator.h"
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namespace oceanbase {
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namespace sql {
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class ObCountSpec : public ObOpSpec {
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OB_UNIS_VERSION_V(1);
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public:
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ObCountSpec(common::ObIAllocator& alloc, const ObPhyOperatorType type);
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INHERIT_TO_STRING_KV("op_spec", ObOpSpec, K_(rownum_limit), K_(anti_monotone_filters));
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ObExpr* rownum_limit_;
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ExprFixedArray anti_monotone_filters_;
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};
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class ObCountOp : public ObOperator {
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public:
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ObCountOp(ObExecContext& exec_ctx, const ObOpSpec& spec, ObOpInput* input);
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virtual int inner_open() override;
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virtual int rescan() override;
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virtual int switch_iterator() override;
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// Increment %cur_rownum_ in get_next_row()
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virtual int get_next_row() override;
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virtual int inner_get_next_row() override;
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virtual void destroy() override
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{
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ObOperator::destroy();
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}
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int64_t get_cur_rownum() const
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{
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return cur_rownum_;
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}
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private:
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// reset default value of %cur_rownum_ && %rownum_limit_
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void reset_default();
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int get_rownum_limit();
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private:
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int64_t cur_rownum_;
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int64_t rownum_limit_;
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};
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} // end namespace sql
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} // end namespace oceanbase
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#endif // OCEANBASE_BASIC_OB_COUNT_OP_H_
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