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59 lines
1.4 KiB
C++
59 lines
1.4 KiB
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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#include <DB/Storages/ColumnDefault.h>
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#include <DB/Interpreters/Context.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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const ColumnDefaults & column_defaults_,
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const Context & context_)
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: output(output_), required_columns(required_columns_),
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column_defaults(column_defaults_), context(context_)
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{
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}
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AddingDefaultBlockOutputStream(BlockOutputStreamPtr output_, NamesAndTypesListPtr required_columns_, const Context & context_)
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: AddingDefaultBlockOutputStream{output_, required_columns_, {}, context_}
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{
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}
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void write(const Block & block) override
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{
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Block res = block;
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res.addDefaults(*required_columns, column_defaults, context);
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output->write(res);
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}
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void flush() { output->flush(); }
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void writePrefix() override { output->writePrefix(); }
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void writeSuffix() override { output->writeSuffix(); }
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private:
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BlockOutputStreamPtr output;
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NamesAndTypesListPtr required_columns;
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const ColumnDefaults & column_defaults;
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Context context;
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};
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}
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