ClickHouse/dbms/src/Storages/StorageMaterializedView.h
2018-02-22 13:03:35 +03:00

73 lines
2.4 KiB
C++

#pragma once
#include <ext/shared_ptr_helper.h>
#include <Storages/IStorage.h>
namespace DB
{
class IAST;
using ASTPtr = std::shared_ptr<IAST>;
class StorageMaterializedView : public ext::shared_ptr_helper<StorageMaterializedView>, public IStorage
{
public:
std::string getName() const override { return "MaterializedView"; }
std::string getTableName() const override { return table_name; }
const NamesAndTypesList & getColumnsListImpl() const override { return columns; }
ASTPtr getInnerQuery() const { return inner_query->clone(); };
StoragePtr getTargetTable() const;
NameAndTypePair getColumn(const String & column_name) const override;
bool hasColumn(const String & column_name) const override;
bool supportsSampling() const override { return getTargetTable()->supportsSampling(); }
bool supportsPrewhere() const override { return getTargetTable()->supportsPrewhere(); }
bool supportsFinal() const override { return getTargetTable()->supportsFinal(); }
bool supportsIndexForIn() const override { return getTargetTable()->supportsIndexForIn(); }
BlockOutputStreamPtr write(const ASTPtr & query, const Settings & settings) override;
void drop() override;
bool optimize(const ASTPtr & query, const ASTPtr & partition, bool final, bool deduplicate, const Context & context) override;
void shutdown() override;
bool checkTableCanBeDropped() const override;
BlockInputStreams read(
const Names & column_names,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size,
unsigned num_streams) override;
String getDataPath() const override { return getTargetTable()->getDataPath(); }
private:
String select_database_name;
String select_table_name;
String target_database_name;
String target_table_name;
String table_name;
String database_name;
ASTPtr inner_query;
Context & global_context;
bool has_inner_table = false;
protected:
StorageMaterializedView(
const String & table_name_,
const String & database_name_,
Context & local_context,
const ASTCreateQuery & query,
const NamesAndTypesList & columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_,
bool attach_);
};
}