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64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#pragma once
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#include <DB/IO/WriteBufferFromFile.h>
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#include <DB/IO/CompressedWriteBuffer.h>
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#include <DB/Columns/ColumnsNumber.h>
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#include <DB/Interpreters/sortBlock.h>
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#include <DB/Storages/MergeTree/MergeTreeData.h>
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namespace DB
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{
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struct BlockWithDateInterval
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{
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Block block;
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UInt16 min_date = std::numeric_limits<UInt16>::max(); /// For further updating, see updateDates method.
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UInt16 max_date = std::numeric_limits<UInt16>::min();
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BlockWithDateInterval() = default;
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BlockWithDateInterval(const Block & block_, UInt16 min_date_, UInt16 max_date_)
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: block(block_), min_date(min_date_), max_date(max_date_) {}
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void updateDates(UInt16 date)
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{
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if (date < min_date)
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min_date = date;
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if (date > max_date)
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max_date = date;
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}
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};
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using BlocksWithDateIntervals = std::list<BlockWithDateInterval>;
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/** Записывает новые куски с данными в merge-дерево.
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*/
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class MergeTreeDataWriter
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{
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public:
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MergeTreeDataWriter(MergeTreeData & data_) : data(data_), log(&Logger::get(data.getLogName() + " (Writer)")) {}
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/** Split the block to blocks, each of them must be written as separate part.
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* (split rows by months)
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* Works deterministically: if same block was passed, function will return same result in same order.
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*/
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BlocksWithDateIntervals splitBlockIntoParts(const Block & block);
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/** All rows must correspond to same month.
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* 'temp_index' - value for 'left' and 'right' for new part. Could be changed later at rename.
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* Returns part with name starting with 'tmp_', yet not added to MergeTreeData.
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*/
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MergeTreeData::MutableDataPartPtr writeTempPart(BlockWithDateInterval & block, Int64 temp_index);
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private:
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MergeTreeData & data;
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Logger * log;
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};
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}
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