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https://github.com/ClickHouse/ClickHouse.git
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495c6e03aa
* Replace all Context references with std::weak_ptr * Fix shared context captured by value * Fix build * Fix Context with named sessions * Fix copy context * Fix gcc build * Merge with master and fix build * Fix gcc-9 build
47 lines
1.2 KiB
C++
47 lines
1.2 KiB
C++
#pragma once
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#include <DataStreams/IBlockOutputStream.h>
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#include <Columns/ColumnConst.h>
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#include <Storages/ColumnsDescription.h>
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namespace DB
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{
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class ExpressionActions;
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using ExpressionActionsPtr = std::shared_ptr<ExpressionActions>;
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class Context;
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/** This stream adds three types of columns into block
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* 1. Columns, that are missed inside request, but present in table without defaults (missed columns)
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* 2. Columns, that are missed inside request, but present in table with defaults (columns with default values)
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* 3. Columns that materialized from other columns (materialized columns)
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* All three types of columns are materialized (not constants).
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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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const BlockOutputStreamPtr & output_,
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const Block & header_,
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const ColumnsDescription & columns_,
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ContextPtr context_);
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Block getHeader() const override { return header; }
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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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private:
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BlockOutputStreamPtr output;
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const Block header;
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ExpressionActionsPtr adding_defaults_actions;
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};
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}
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