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31 lines
809 B
C++
31 lines
809 B
C++
#pragma once
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#include <DB/DataStreams/IBlockOutputStream.h>
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namespace DB
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{
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/** Преобразует столбцы-константы в полноценные столбцы ("материализует" их).
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*/
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class MaterializingBlockOutputStream : public IBlockOutputStream
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{
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public:
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MaterializingBlockOutputStream(const BlockOutputStreamPtr & output);
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void write(const Block & block) override;
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void flush() override;
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void writePrefix() override;
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void writeSuffix() override;
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void setRowsBeforeLimit(size_t rows_before_limit) override;
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void setTotals(const Block & totals) override;
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void setExtremes(const Block & extremes) override;
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String getContentType() const override;
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private:
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static Block materialize(const Block & original_block);
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private:
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BlockOutputStreamPtr output;
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};
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}
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