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73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
#pragma once
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#include <Poco/SharedPtr.h>
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#include <DB/DataStreams/IProfilingBlockInputStream.h>
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#include <DB/Interpreters/evaluateMissingDefaults.h>
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#include <DB/Columns/ColumnConst.h>
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#include <DB/Storages/ColumnDefault.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 AddingDefaultBlockInputStream : public IProfilingBlockInputStream
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{
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public:
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AddingDefaultBlockInputStream(
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BlockInputStreamPtr input_,
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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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: required_columns(required_columns_),
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column_defaults(column_defaults_), context(context_)
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{
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children.push_back(input_);
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}
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AddingDefaultBlockInputStream(BlockInputStreamPtr input_, NamesAndTypesListPtr required_columns_, const Context & context_)
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: AddingDefaultBlockInputStream{input_, required_columns_, ColumnDefaults{}, context_}
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{
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}
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String getName() const override { return "AddingDefault"; }
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String getID() const override
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{
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std::stringstream res;
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res << "AddingDefault(" << children.back()->getID();
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for (NamesAndTypesList::const_iterator it = required_columns->begin(); it != required_columns->end(); ++it)
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res << ", " << it->name << ", " << it->type->getName();
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res << ")";
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return res.str();
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}
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protected:
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Block readImpl() override
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{
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Block res = children.back()->read();
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if (!res)
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return res;
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/** @todo if somehow block does not contain values for implicitly-defaulted columns that are prerequisites
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* for explicitly-defaulted ones, exception will be thrown during evaluating such columns
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* (implicitly-defaulted columns are evaluated on the line after following one. */
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evaluateMissingDefaults(res, *required_columns, column_defaults, context);
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res.addDefaults(*required_columns);
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return res;
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}
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private:
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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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