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64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
#pragma once
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#include <DB/Parsers/ASTSelectQuery.h>
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#include <DB/Storages/IStorage.h>
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namespace DB
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{
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class StorageView : public IStorage
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{
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public:
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static StoragePtr create(
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const String & table_name_,
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const String & database_name_,
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Context & context_,
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ASTPtr & query_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_);
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std::string getName() const override { return "View"; }
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std::string getTableName() const override { return table_name; }
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const NamesAndTypesList & getColumnsListImpl() const override { return *columns; }
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ASTPtr getInnerQuery() const { return inner_query.clone(); };
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/// Пробрасывается внутрь запроса и решается на его уровне.
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bool supportsSampling() const override { return true; }
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bool supportsFinal() const override { return true; }
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BlockInputStreams read(
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const Names & column_names,
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ASTPtr query,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size = DEFAULT_BLOCK_SIZE,
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unsigned threads = 1) override;
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void drop() override;
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protected:
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String select_database_name;
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String select_table_name;
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String table_name;
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String database_name;
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ASTSelectQuery inner_query;
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Context & context;
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NamesAndTypesListPtr columns;
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StorageView(
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const String & table_name_,
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const String & database_name_,
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Context & context_,
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ASTPtr & query_,
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NamesAndTypesListPtr columns_,
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const NamesAndTypesList & materialized_columns_,
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const NamesAndTypesList & alias_columns_,
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const ColumnDefaults & column_defaults_);
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};
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}
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