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43 lines
887 B
C++
43 lines
887 B
C++
#pragma once
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#include <Poco/SharedPtr.h>
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#include <DB/DataStreams/IBlockOutputStream.h>
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#include <DB/Columns/ColumnConst.h>
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namespace DB
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{
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/** Добавляет в блок недостающие столбцы со значениями по-умолчанию.
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* Эти столбцы - материалированные (не константы).
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*/
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class AddingDefaultBlockOutputStream : public IBlockOutputStream
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{
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public:
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AddingDefaultBlockOutputStream(
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BlockOutputStreamPtr output_,
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NamesAndTypesListPtr required_columns_)
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: output(output_), required_columns(required_columns_)
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{
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}
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String getName() const { return "AddingDefaultBlockOutputStream"; }
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void write(const Block & block)
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{
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Block res = block;
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res.addDefaults(required_columns);
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output->write(res);
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}
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private:
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BlockOutputStreamPtr output;
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NamesAndTypesListPtr required_columns;
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};
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}
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