ClickHouse/dbms/Databases/IDatabase.h

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#pragma once
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#include <Core/Types.h>
#include <Parsers/IAST_fwd.h>
#include <Storages/IStorage_fwd.h>
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#include <Storages/StorageInMemoryMetadata.h>
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#include <Dictionaries/IDictionary.h>
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#include <Common/Exception.h>
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#include <ctime>
#include <functional>
#include <memory>
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namespace DB
{
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class Context;
struct Settings;
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struct ConstraintsDescription;
class ColumnsDescription;
struct IndicesDescription;
struct TableStructureWriteLockHolder;
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class ASTCreateQuery;
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using Dictionaries = std::set<String>;
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namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
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extern const int CANNOT_GET_CREATE_TABLE_QUERY;
extern const int CANNOT_GET_CREATE_DICTIONARY_QUERY;
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}
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class IDatabaseTablesIterator
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{
public:
virtual void next() = 0;
virtual bool isValid() const = 0;
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virtual const String & name() const = 0;
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virtual const StoragePtr & table() const = 0;
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virtual ~IDatabaseTablesIterator() = default;
};
/// Copies list of tables and iterates through such snapshot.
class DatabaseTablesSnapshotIterator final : public IDatabaseTablesIterator
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{
private:
Tables tables;
Tables::iterator it;
public:
DatabaseTablesSnapshotIterator(Tables & tables_) : tables(tables_), it(tables.begin()) {}
DatabaseTablesSnapshotIterator(Tables && tables_) : tables(tables_), it(tables.begin()) {}
void next() override { ++it; }
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bool isValid() const override { return it != tables.end(); }
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const String & name() const override { return it->first; }
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const StoragePtr & table() const override { return it->second; }
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};
/// Copies list of dictionaries and iterates through such snapshot.
class DatabaseDictionariesSnapshotIterator
{
private:
Dictionaries dictionaries;
Dictionaries::iterator it;
public:
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DatabaseDictionariesSnapshotIterator() = default;
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DatabaseDictionariesSnapshotIterator(Dictionaries & dictionaries_) : dictionaries(dictionaries_), it(dictionaries.begin()) {}
DatabaseDictionariesSnapshotIterator(Dictionaries && dictionaries_) : dictionaries(dictionaries_), it(dictionaries.begin()) {}
void next() { ++it; }
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bool isValid() const { return !dictionaries.empty() && it != dictionaries.end(); }
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const String & name() const { return *it; }
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};
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using DatabaseTablesIteratorPtr = std::unique_ptr<IDatabaseTablesIterator>;
using DatabaseDictionariesIteratorPtr = std::unique_ptr<DatabaseDictionariesSnapshotIterator>;
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/** Database engine.
* It is responsible for:
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* - initialization of set of known tables and dictionaries;
* - checking existence of a table and getting a table object;
* - retrieving a list of all tables;
* - creating and dropping tables;
* - renaming tables and moving between databases with same engine.
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*/
class IDatabase : public std::enable_shared_from_this<IDatabase>
{
public:
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IDatabase() = delete;
IDatabase(String database_name_) : database_name(std::move(database_name_)) {}
/// Get name of database engine.
virtual String getEngineName() const = 0;
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/// Load a set of existing tables.
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/// You can call only once, right after the object is created.
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virtual void loadStoredObjects(Context & /*context*/, bool /*has_force_restore_data_flag*/) {}
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/// Check the existence of the table.
virtual bool isTableExist(
const Context & context,
const String & name) const = 0;
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/// Check the existence of the dictionary
virtual bool isDictionaryExist(
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const Context & /*context*/,
const String & /*name*/) const
{
return false;
}
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/// Get the table for work. Return nullptr if there is no table.
virtual StoragePtr tryGetTable(
const Context & context,
const String & name) const = 0;
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using FilterByNameFunction = std::function<bool(const String &)>;
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/// Get an iterator that allows you to pass through all the tables.
/// It is possible to have "hidden" tables that are not visible when passing through, but are visible if you get them by name using the functions above.
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virtual DatabaseTablesIteratorPtr getTablesIterator(const Context & context, const FilterByNameFunction & filter_by_table_name = {}) = 0;
/// Get an iterator to pass through all the dictionaries.
virtual DatabaseDictionariesIteratorPtr getDictionariesIterator(const Context & /*context*/, [[maybe_unused]] const FilterByNameFunction & filter_by_dictionary_name = {})
{
return std::make_unique<DatabaseDictionariesSnapshotIterator>();
}
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/// Get an iterator to pass through all the tables and dictionary tables.
virtual DatabaseTablesIteratorPtr getTablesWithDictionaryTablesIterator(const Context & context, const FilterByNameFunction & filter_by_name = {})
{
return getTablesIterator(context, filter_by_name);
}
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/// Is the database empty.
virtual bool empty(const Context & context) const = 0;
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/// Add the table to the database. Record its presence in the metadata.
virtual void createTable(
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const Context & /*context*/,
const String & /*name*/,
const StoragePtr & /*table*/,
const ASTPtr & /*query*/)
{
throw Exception("There is no CREATE TABLE query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Add the dictionary to the database. Record its presence in the metadata.
virtual void createDictionary(
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const Context & /*context*/,
const String & /*dictionary_name*/,
const ASTPtr & /*query*/)
{
throw Exception("There is no CREATE DICTIONARY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Delete the table from the database. Delete the metadata.
virtual void removeTable(
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const Context & /*context*/,
const String & /*name*/)
{
throw Exception("There is no DROP TABLE query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Delete the dictionary from the database. Delete the metadata.
virtual void removeDictionary(
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const Context & /*context*/,
const String & /*dictionary_name*/)
{
throw Exception("There is no DROP DICTIONARY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Add a table to the database, but do not add it to the metadata. The database may not support this method.
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virtual void attachTable(const String & /*name*/, const StoragePtr & /*table*/)
{
throw Exception("There is no ATTACH TABLE query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Add dictionary to the database, but do not add it to the metadata. The database may not support this method.
/// If dictionaries_lazy_load is false it also starts loading the dictionary asynchronously.
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virtual void attachDictionary(const String & /*name*/, const Context & /*context*/)
{
throw Exception("There is no ATTACH DICTIONARY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Forget about the table without deleting it, and return it. The database may not support this method.
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virtual StoragePtr detachTable(const String & /*name*/)
{
throw Exception("There is no DETACH TABLE query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Forget about the dictionary without deleting it. The database may not support this method.
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virtual void detachDictionary(const String & /*name*/, const Context & /*context*/)
{
throw Exception("There is no DETACH DICTIONARY query for Database" + getEngineName(), ErrorCodes::NOT_IMPLEMENTED);
}
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/// Rename the table and possibly move the table to another database.
virtual void renameTable(
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const Context & /*context*/,
const String & /*name*/,
IDatabase & /*to_database*/,
const String & /*to_name*/,
TableStructureWriteLockHolder &)
{
throw Exception(getEngineName() + ": renameTable() is not supported", ErrorCodes::NOT_IMPLEMENTED);
}
using ASTModifier = std::function<void(IAST &)>;
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/// Change the table structure in metadata.
/// You must call under the TableStructureLock of the corresponding table . If engine_modifier is empty, then engine does not change.
virtual void alterTable(
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const Context & /*context*/,
const String & /*name*/,
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const StorageInMemoryMetadata & /*metadata*/)
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{
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throw Exception(getEngineName() + ": alterTable() is not supported", ErrorCodes::NOT_IMPLEMENTED);
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}
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/// Returns time of table's metadata change, 0 if there is no corresponding metadata file.
virtual time_t getObjectMetadataModificationTime(const String & /*name*/) const
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{
return static_cast<time_t>(0);
}
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/// Get the CREATE TABLE query for the table. It can also provide information for detached tables for which there is metadata.
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ASTPtr tryGetCreateTableQuery(const Context & context, const String & name) const noexcept
{
return getCreateTableQueryImpl(context, name, false);
}
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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ASTPtr getCreateTableQuery(const Context & context, const String & name) const
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{
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return getCreateTableQueryImpl(context, name, true);
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}
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/// Get the CREATE DICTIONARY query for the dictionary. Returns nullptr if dictionary doesn't exists.
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ASTPtr tryGetCreateDictionaryQuery(const Context & context, const String & name) const noexcept
{
return getCreateDictionaryQueryImpl(context, name, false);
}
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ASTPtr getCreateDictionaryQuery(const Context & context, const String & name) const
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{
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return getCreateDictionaryQueryImpl(context, name, true);
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}
/// Get the CREATE DATABASE query for current database.
virtual ASTPtr getCreateDatabaseQuery(const Context & /*context*/) const = 0;
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/// Get name of database.
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String getDatabaseName() const { return database_name; }
/// Returns path for persistent data storage if the database supports it, empty string otherwise
virtual String getDataPath() const { return {}; }
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/// Returns path for persistent data storage for table if the database supports it, empty string otherwise. Table must exist
virtual String getTableDataPath(const String & /*table_name*/) const { return {}; }
/// Returns path for persistent data storage for CREATE/ATTACH query if the database supports it, empty string otherwise
virtual String getTableDataPath(const ASTCreateQuery & /*query*/) const { return {}; }
/// Returns metadata path if the database supports it, empty string otherwise
virtual String getMetadataPath() const { return {}; }
/// Returns metadata path of a concrete table if the database supports it, empty string otherwise
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virtual String getObjectMetadataPath(const String & /*table_name*/) const { return {}; }
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/// Ask all tables to complete the background threads they are using and delete all table objects.
virtual void shutdown() = 0;
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/// Delete data and metadata stored inside the database, if exists.
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virtual void drop(const Context & /*context*/) {}
virtual ~IDatabase() {}
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protected:
virtual ASTPtr getCreateTableQueryImpl(const Context & /*context*/, const String & /*name*/, bool throw_on_error) const
{
if (throw_on_error)
throw Exception("There is no SHOW CREATE TABLE query for Database" + getEngineName(), ErrorCodes::CANNOT_GET_CREATE_TABLE_QUERY);
return nullptr;
}
virtual ASTPtr getCreateDictionaryQueryImpl(const Context & /*context*/, const String & /*name*/, bool throw_on_error) const
{
if (throw_on_error)
throw Exception("There is no SHOW CREATE DICTIONARY query for Database" + getEngineName(), ErrorCodes::CANNOT_GET_CREATE_DICTIONARY_QUERY);
return nullptr;
}
String database_name;
Squashed commit of the following: commit f9b478181cd49224154cc350fb57df7121842f1c Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 04:06:36 2016 +0300 Database engines: development [#METR-19997]. commit f7a10a67761ccfd05f3dac32d6444920cd8d4d60 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 03:44:37 2016 +0300 Database engines: development [#METR-19997]. commit bd98a8558e98bad2bed278e5762c4e0fc66e6f38 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:33:59 2016 +0300 Database engines: development [#METR-19997]. commit 19712fd884c22a4e2c2b67474086dea8f44e7c7b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Sat Mar 19 00:03:11 2016 +0300 Database engines: development [#METR-19997]. commit 50274d6df7e91fcc34aab8a8c72347daa2c6512f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 23:24:57 2016 +0300 Database engines: development [#METR-19997]. commit 4a0b99b19b34e90ef8b7be2d199f6232e36ef3f7 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 22:50:36 2016 +0300 Database engines: development [#METR-19997]. commit 44ff3ebba7a3e460a27a89f31ddf199dbea1d182 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 15:09:17 2016 +0300 Database engines: development [#METR-19997]. commit 137c31f3004cfd282473b6acb01cbe1b4ca2aadd Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:26:34 2016 +0300 Database engines: development [#METR-19997]. commit aa4c0496d4afe4a691164254be2bd5600542b38a Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 03:22:59 2016 +0300 Database engines: development [#METR-19997]. commit 5a94d1f0607450a2dac28a4d7df8b1393a864c23 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Fri Mar 18 01:02:40 2016 +0300 Database engines: development [#METR-19997]. commit 50fd5b52ea1141955a5dfba0dcb191f3289ac25b Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 23:23:40 2016 +0300 Database engines: development [#METR-19997]. commit a333d91b058e4f56dd83a6d2878c3c2bd8efc002 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 20:29:07 2016 +0300 Database engines: development [#METR-19997]. commit f81d366e7ac8348436f2698d040f8e341743a024 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Thu Mar 17 01:30:23 2016 +0300 Database engines: development [#METR-19997]. commit d0696860c9060827896214c08d147c759ea79376 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 21:55:31 2016 +0300 Database engines: development [#METR-19997]. commit 46a168c2ada140a0e95cd8d4b9d8ba9bac855d11 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 08:00:58 2016 +0300 Database engines: development [#METR-19997]. commit 20a2bad161454225fc1b5f9b919b842fbebc3231 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:51:10 2016 +0300 Database engines: development [#METR-19997]. commit ca0a77fcc2a8d0b276eb3743c53551ad3fe16314 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 06:02:20 2016 +0300 Reverted erroneous modification [#METR-19997]. commit 1370bdcc4594182f6ef2b146f9afabfe1c295080 Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Wed Mar 16 00:41:34 2016 +0300 Database engines: development [#METR-19997]. commit 16e72c67041cae6471509d3f0f3d4a9aa7b7dc0f Author: Alexey Milovidov <milovidov@yandex-team.ru> Date: Tue Mar 15 00:41:48 2016 +0300 Database engines: development [#METR-19997].
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};
using DatabasePtr = std::shared_ptr<IDatabase>;
using Databases = std::map<String, DatabasePtr>;
}