ClickHouse/dbms/src/Storages/StorageSet.h

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#pragma once
#include <ext/shared_ptr_helper.hpp>
#include <Storages/IStorage.h>
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namespace DB
{
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class Set;
using SetPtr = std::shared_ptr<Set>;
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/** Common part of StorageSet and StorageJoin.
*/
class StorageSetOrJoinBase : private ext::shared_ptr_helper<StorageSetOrJoinBase>, public IStorage
{
friend class ext::shared_ptr_helper<StorageSetOrJoinBase>;
friend class SetOrJoinBlockOutputStream;
public:
String getTableName() const override { return name; }
const NamesAndTypesList & getColumnsListImpl() const override { return *columns; }
void rename(const String & new_path_to_db, const String & new_database_name, const String & new_table_name) override;
BlockOutputStreamPtr write(ASTPtr query, const Settings & settings) override;
protected:
StorageSetOrJoinBase(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_);
String path;
String name;
NamesAndTypesListPtr columns;
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UInt64 increment = 0; /// For the backup file names.
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/// Restore from backup.
void restore();
private:
void restoreFromFile(const String & file_path);
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/// Insert the block into the state.
virtual void insertBlock(const Block & block) = 0;
virtual size_t getSize() const = 0;
};
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/** Lets you save the set for later use on the right side of the IN statement.
* When inserted into a table, the data will be inserted into the set,
* and also written to a file-backup, for recovery after a restart.
* Reading from the table is not possible directly - it is possible to specify only the right part of the IN statement.
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*/
class StorageSet : private ext::shared_ptr_helper<StorageSet>, public StorageSetOrJoinBase
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{
friend class ext::shared_ptr_helper<StorageSet>;
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public:
static StoragePtr create(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_)
{
return ext::shared_ptr_helper<StorageSet>::make_shared(path_, name_, columns_, materialized_columns_, alias_columns_, column_defaults_);
}
String getName() const override { return "Set"; }
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/// Access the insides.
SetPtr & getSet() { return set; }
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private:
SetPtr set;
StorageSet(
const String & path_,
const String & name_,
NamesAndTypesListPtr columns_,
const NamesAndTypesList & materialized_columns_,
const NamesAndTypesList & alias_columns_,
const ColumnDefaults & column_defaults_);
void insertBlock(const Block & block) override;
size_t getSize() const override;
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};
}