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#include <Parsers/ASTRenameQuery.h>
#include <Databases/IDatabase.h>
#include <Interpreters/Context.h>
#include <Interpreters/InterpreterRenameQuery.h>
#include <Storages/IStorage.h>
#include <Interpreters/executeDDLQueryOnCluster.h>
#include <Interpreters/QueryLog.h>
#include <Access/Common/AccessRightsElement.h>
#include <Common/typeid_cast.h>
#include <Databases/DatabaseReplicated.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
extern const int LOGICAL_ERROR;
}
InterpreterRenameQuery::InterpreterRenameQuery(const ASTPtr & query_ptr_, ContextPtr context_)
: WithContext(context_), query_ptr(query_ptr_)
{
}
BlockIO InterpreterRenameQuery::execute()
{
const auto & rename = query_ptr->as<const ASTRenameQuery &>();
if (!rename.cluster.empty())
{
DDLQueryOnClusterParams params;
params.access_to_check = getRequiredAccess(rename.database ? RenameType::RenameDatabase : RenameType::RenameTable);
return executeDDLQueryOnCluster(query_ptr, getContext(), params);
}
getContext()->checkAccess(getRequiredAccess(rename.database ? RenameType::RenameDatabase : RenameType::RenameTable));
String path = getContext()->getPath();
String current_database = getContext()->getCurrentDatabase();
/** In case of error while renaming, it is possible that only part of tables was renamed
* or we will be in inconsistent state. (It is worth to be fixed.)
*/
RenameDescriptions descriptions;
descriptions.reserve(rename.elements.size());
/// Don't allow to drop tables (that we are renaming); don't allow to create tables in places where tables will be renamed.
TableGuards table_guards;
for (const auto & elem : rename.elements)
{
descriptions.emplace_back(elem, current_database);
const auto & description = descriptions.back();
UniqueTableName from(description.from_database_name, description.from_table_name);
UniqueTableName to(description.to_database_name, description.to_table_name);
table_guards[from];
table_guards[to];
}
auto & database_catalog = DatabaseCatalog::instance();
/// Must do it in consistent order.
for (auto & table_guard : table_guards)
table_guard.second = database_catalog.getDDLGuard(table_guard.first.database_name, table_guard.first.table_name);
if (rename.database)
return executeToDatabase(rename, descriptions);
else
return executeToTables(rename, descriptions, table_guards);
}
BlockIO InterpreterRenameQuery::executeToTables(const ASTRenameQuery & rename, const RenameDescriptions & descriptions, TableGuards & ddl_guards)
{
assert(!rename.rename_if_cannot_exchange || descriptions.size() == 1);
assert(!(rename.rename_if_cannot_exchange && rename.exchange));
auto & database_catalog = DatabaseCatalog::instance();
for (const auto & elem : descriptions)
{
if (elem.if_exists)
{
assert(!rename.exchange);
if (!database_catalog.isTableExist(StorageID(elem.from_database_name, elem.from_table_name), getContext()))
continue;
}
bool exchange_tables;
if (rename.exchange)
{
exchange_tables = true;
}
else if (rename.rename_if_cannot_exchange)
{
exchange_tables = database_catalog.isTableExist(StorageID(elem.to_database_name, elem.to_table_name), getContext());
renamed_instead_of_exchange = !exchange_tables;
}
else
{
exchange_tables = false;
database_catalog.assertTableDoesntExist(StorageID(elem.to_database_name, elem.to_table_name), getContext());
}
DatabasePtr database = database_catalog.getDatabase(elem.from_database_name);
if (database->shouldReplicateQuery(getContext(), query_ptr))
{
if (1 < descriptions.size())
throw Exception(
ErrorCodes::NOT_IMPLEMENTED,
"Database {} is Replicated, "
"it does not support renaming of multiple tables in single query.",
elem.from_database_name);
UniqueTableName from(elem.from_database_name, elem.from_table_name);
UniqueTableName to(elem.to_database_name, elem.to_table_name);
ddl_guards[from]->releaseTableLock();
ddl_guards[to]->releaseTableLock();
return database->tryEnqueueReplicatedDDL(query_ptr, getContext());
}
else
{
StorageID from_table_id{elem.from_database_name, elem.from_table_name};
StorageID to_table_id{elem.to_database_name, elem.to_table_name};
std::vector<StorageID> ref_dependencies;
std::vector<StorageID> loading_dependencies;
if (!exchange_tables)
{
bool check_ref_deps = getContext()->getSettingsRef().check_referential_table_dependencies;
bool check_loading_deps = !check_ref_deps && getContext()->getSettingsRef().check_table_dependencies;
std::tie(ref_dependencies, loading_dependencies) = database_catalog.removeDependencies(from_table_id, check_ref_deps, check_loading_deps);
}
try
{
database->renameTable(
getContext(),
elem.from_table_name,
*database_catalog.getDatabase(elem.to_database_name),
elem.to_table_name,
exchange_tables,
rename.dictionary);
DatabaseCatalog::instance().addDependencies(to_table_id, ref_dependencies, loading_dependencies);
}
catch (...)
{
/// Restore dependencies if RENAME fails
DatabaseCatalog::instance().addDependencies(from_table_id, ref_dependencies, loading_dependencies);
throw;
}
}
}
return {};
}
BlockIO InterpreterRenameQuery::executeToDatabase(const ASTRenameQuery &, const RenameDescriptions & descriptions)
{
assert(descriptions.size() == 1);
assert(descriptions.front().from_table_name.empty());
assert(descriptions.front().to_table_name.empty());
const auto & old_name = descriptions.front().from_database_name;
const auto & new_name = descriptions.back().to_database_name;
auto & catalog = DatabaseCatalog::instance();
auto db = descriptions.front().if_exists ? catalog.tryGetDatabase(old_name) : catalog.getDatabase(old_name);
if (db)
{
catalog.assertDatabaseDoesntExist(new_name);
db->renameDatabase(getContext(), new_name);
}
return {};
}
AccessRightsElements InterpreterRenameQuery::getRequiredAccess(InterpreterRenameQuery::RenameType type) const
{
AccessRightsElements required_access;
const auto & rename = query_ptr->as<const ASTRenameQuery &>();
for (const auto & elem : rename.elements)
{
if (type == RenameType::RenameTable)
{
required_access.emplace_back(AccessType::SELECT | AccessType::DROP_TABLE, elem.from.getDatabase(), elem.from.getTable());
required_access.emplace_back(AccessType::CREATE_TABLE | AccessType::INSERT, elem.to.getDatabase(), elem.to.getTable());
if (rename.exchange)
{
required_access.emplace_back(AccessType::CREATE_TABLE | AccessType::INSERT, elem.from.getDatabase(), elem.from.getTable());
required_access.emplace_back(AccessType::SELECT | AccessType::DROP_TABLE, elem.to.getDatabase(), elem.to.getTable());
}
}
else if (type == RenameType::RenameDatabase)
{
required_access.emplace_back(AccessType::SELECT | AccessType::DROP_DATABASE, elem.from.getDatabase());
required_access.emplace_back(AccessType::CREATE_DATABASE | AccessType::INSERT, elem.to.getDatabase());
}
else
{
throw Exception(ErrorCodes::LOGICAL_ERROR, "Unknown type of rename query");
}
}
return required_access;
}
void InterpreterRenameQuery::extendQueryLogElemImpl(QueryLogElement & elem, const ASTPtr & ast, ContextPtr) const
{
const auto & rename = ast->as<const ASTRenameQuery &>();
for (const auto & element : rename.elements)
{
{
String database = backQuoteIfNeed(!element.from.database ? getContext()->getCurrentDatabase() : element.from.getDatabase());
elem.query_databases.insert(database);
elem.query_tables.insert(database + "." + backQuoteIfNeed(element.from.getTable()));
}
{
String database = backQuoteIfNeed(!element.to.database ? getContext()->getCurrentDatabase() : element.to.getDatabase());
elem.query_databases.insert(database);
elem.query_tables.insert(database + "." + backQuoteIfNeed(element.to.getTable()));
}
}
}
}
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