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71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
#pragma once
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#include <Core/Types.h>
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#include <DataStreams/IBlockStream_fwd.h>
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#include <Common/Stopwatch.h>
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#include <vector>
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namespace DB
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{
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class Block;
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class ReadBuffer;
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class WriteBuffer;
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/// Information for profiling. See IBlockInputStream.h
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struct BlockStreamProfileInfo
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{
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/// Info about stream object this profile info refers to.
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IBlockInputStream * parent = nullptr;
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bool started = false;
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Stopwatch total_stopwatch {CLOCK_MONOTONIC_COARSE}; /// Time with waiting time
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size_t rows = 0;
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size_t blocks = 0;
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size_t bytes = 0;
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using BlockStreamProfileInfos = std::vector<const BlockStreamProfileInfo *>;
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/// Collect BlockStreamProfileInfo for the nearest sources in the tree named `name`. Example; collect all info for PartialSorting streams.
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void collectInfosForStreamsWithName(const char * name, BlockStreamProfileInfos & res) const;
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/** Get the number of rows if there were no LIMIT.
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* If there is no LIMIT, 0 is returned.
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* If the query does not contain ORDER BY, the number can be underestimated - return the number of rows in blocks that were read before LIMIT reached.
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* If the query contains an ORDER BY, then returns the exact number of rows as if LIMIT is removed from query.
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*/
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size_t getRowsBeforeLimit() const;
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bool hasAppliedLimit() const;
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void update(Block & block);
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void update(size_t num_rows, size_t num_bytes);
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/// Binary serialization and deserialization of main fields.
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/// Writes only main fields i.e. fields that required by internal transmission protocol.
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void read(ReadBuffer & in);
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void write(WriteBuffer & out) const;
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/// Sets main fields from other object (see methods above).
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/// If skip_block_size_info if true, then rows, bytes and block fields are ignored.
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void setFrom(const BlockStreamProfileInfo & rhs, bool skip_block_size_info);
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/// Only for Processors.
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void setRowsBeforeLimit(size_t rows_before_limit_)
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{
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applied_limit = true;
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rows_before_limit = rows_before_limit_;
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}
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private:
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void calculateRowsBeforeLimit() const;
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/// For these fields we make accessors, because they must be calculated beforehand.
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mutable bool applied_limit = false; /// Whether LIMIT was applied
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mutable size_t rows_before_limit = 0;
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mutable bool calculated_rows_before_limit = false; /// Whether the field rows_before_limit was calculated
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};
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}
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