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33 lines
1.1 KiB
C++
33 lines
1.1 KiB
C++
#pragma once
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#include <boost/noncopyable.hpp>
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#include <Core/Block.h>
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#include <IO/ReadBufferFromFileBase.h>
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#include <Storages/MergeTree/MergeTreeReadTask.h>
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namespace DB
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{
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/// The interface that determines how tasks for reading (MergeTreeReadTask)
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/// are distributed among data parts with ranges.
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class IMergeTreeReadPool : private boost::noncopyable
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{
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public:
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virtual ~IMergeTreeReadPool() = default;
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virtual String getName() const = 0;
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virtual Block getHeader() const = 0;
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/// Returns true if tasks are returned in the same order as the order of ranges passed to pool
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virtual bool preservesOrderOfRanges() const = 0;
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/// task_idx is an implementation defined identifier that helps
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/// to get required task. E.g. it may be number of thread in case of Default reading type or an index of a part in case of InOrder/InReverseOrder reading type.
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virtual MergeTreeReadTaskPtr getTask(size_t task_idx, MergeTreeReadTask * previous_task) = 0;
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virtual void profileFeedback(ReadBufferFromFileBase::ProfileInfo info) = 0;
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};
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using MergeTreeReadPoolPtr = std::shared_ptr<IMergeTreeReadPool>;
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}
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