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29 lines
779 B
C++
29 lines
779 B
C++
#pragma once
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#include <IO/ReadBufferFromFileBase.h>
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#include <string>
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#include <memory>
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namespace DB
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{
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/** Create an object to read data from a file.
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* estimated_size - the number of bytes to read
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* aio_threshold - the minimum number of bytes for asynchronous reads
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*
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* If aio_threshold = 0 or estimated_size < aio_threshold, read operations are executed synchronously.
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* Otherwise, the read operations are performed asynchronously.
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*/
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std::unique_ptr<ReadBufferFromFileBase> createReadBufferFromFileBase(
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const std::string & filename_,
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size_t estimated_size,
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size_t aio_threshold,
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size_t mmap_threshold,
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size_t buffer_size_ = DBMS_DEFAULT_BUFFER_SIZE,
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int flags_ = -1,
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char * existing_memory_ = nullptr,
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size_t alignment = 0);
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}
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