75 lines
2.7 KiB
C++
75 lines
2.7 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_SRC_SQL_ENGINE_AGGREGATE_OB_SCALAR_AGGREGATE_H_
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#define OCEANBASE_SRC_SQL_ENGINE_AGGREGATE_OB_SCALAR_AGGREGATE_H_
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#include "common/row/ob_row_store.h"
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#include "sql/engine/aggregate/ob_groupby.h"
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#include "sql/engine/aggregate/ob_aggregate_function.h"
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namespace oceanbase {
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namespace common {
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class ObNewRow;
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} // namespace common
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namespace sql {
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class ObScalarAggregate : public ObGroupBy {
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protected:
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class ObScalarAggregateCtx;
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public:
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explicit ObScalarAggregate(common::ObIAllocator& alloc);
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virtual ~ObScalarAggregate();
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virtual void reset();
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virtual void reuse();
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virtual int rescan(ObExecContext& ctx) const;
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virtual int switch_iterator(ObExecContext& ctx) const override;
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protected:
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virtual int inner_get_next_row(ObExecContext& ctx, const common::ObNewRow*& row) const;
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/**
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* @brief open operator, not including children operators.
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* called by open.
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* Every op should implement this method.
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*/
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virtual int inner_open(ObExecContext& ctx) const;
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/**
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* @brief close operator, not including children operators.
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* Every op should implement this method.
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*/
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virtual int inner_close(ObExecContext& ctx) const;
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/**
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* @brief create operator context, only child operator can know it's specific operator type,
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* so must be overwrited by child operator,
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* @param ctx[in], execute context
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* @param op_ctx[out], the pointer of operator context
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* @return if success, return OB_SUCCESS, otherwise, return errno
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*/
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virtual int inner_create_operator_ctx(ObExecContext& ctx, ObPhyOperatorCtx*& op_ctx) const;
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/**
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* @brief for specified phy operator to print it's member variable with json key-value format
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* @param buf[in] to string buffer
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* @param buf_len[in] buffer length
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* @return if success, return the length used by print string, otherwise return 0
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*/
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virtual int64_t to_string_kv(char* buf, const int64_t buf_len) const;
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virtual int add_group_column_idx(int64_t column_idx, common::ObCollationType cs_type);
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private:
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// disallow copy
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DISALLOW_COPY_AND_ASSIGN(ObScalarAggregate);
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};
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} // namespace sql
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} // namespace oceanbase
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#endif /* OCEANBASE_SRC_SQL_ENGINE_AGGREGATE_OB_SCALAR_AGGREGATE_H_ */
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