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#include <Storages/StorageNull.h>
#include <Storages/StorageFactory.h>
#include <Storages/AlterCommands.h>
#include <Interpreters/InterpreterAlterQuery.h>
#include <Interpreters/Context.h>
#include <Databases/IDatabase.h>
#include <IO/WriteHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NOT_IMPLEMENTED;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ALTER_OF_COLUMN_IS_FORBIDDEN;
}
void registerStorageNull(StorageFactory & factory)
{
factory.registerStorage("Null", [](const StorageFactory::Arguments & args)
{
if (!args.engine_args.empty())
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "Engine {} doesn't support any arguments ({} given)",
args.engine_name, args.engine_args.size());
return std::make_shared<StorageNull>(args.table_id, args.columns, args.constraints, args.comment);
},
{
.supports_parallel_insert = true,
});
}
void StorageNull::checkAlterIsPossible(const AlterCommands & commands, ContextPtr context) const
{
std::optional<NameDependencies> name_deps{};
for (const auto & command : commands)
{
if (command.type != AlterCommand::Type::ADD_COLUMN
&& command.type != AlterCommand::Type::MODIFY_COLUMN
&& command.type != AlterCommand::Type::DROP_COLUMN
&& command.type != AlterCommand::Type::COMMENT_COLUMN
&& command.type != AlterCommand::Type::COMMENT_TABLE)
throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Alter of type '{}' is not supported by storage {}",
command.type, getName());
if (command.type == AlterCommand::DROP_COLUMN && !command.clear)
{
if (!name_deps)
name_deps = getDependentViewsByColumn(context);
const auto & deps_mv = name_deps.value()[command.column_name];
if (!deps_mv.empty())
{
throw Exception(ErrorCodes::ALTER_OF_COLUMN_IS_FORBIDDEN,
"Trying to ALTER DROP column {} which is referenced by materialized view {}",
backQuoteIfNeed(command.column_name), toString(deps_mv)
);
}
}
}
}
void StorageNull::alter(const AlterCommands & params, ContextPtr context, AlterLockHolder &)
{
auto table_id = getStorageID();
StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
params.apply(new_metadata, context);
DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(context, table_id, new_metadata);
setInMemoryMetadata(new_metadata);
}
}
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