ClickHouse/dbms/src/Storages/StorageFactory.cpp

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#include <Storages/StorageFactory.h>
#include <Interpreters/Context.h>
#include <Parsers/ASTFunction.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTCreateQuery.h>
#include <Common/Exception.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_STORAGE;
extern const int LOGICAL_ERROR;
extern const int INCORRECT_QUERY;
extern const int ENGINE_REQUIRED;
extern const int FUNCTION_CANNOT_HAVE_PARAMETERS;
extern const int BAD_ARGUMENTS;
extern const int DATA_TYPE_CANNOT_BE_USED_IN_TABLES;
}
/// Some types are only for intermediate values of expressions and cannot be used in tables.
static void checkAllTypesAreAllowedInTable(const NamesAndTypesList & names_and_types)
{
for (const auto & elem : names_and_types)
if (elem.type->cannotBeStoredInTables())
throw Exception("Data type " + elem.type->getName() + " cannot be used in tables", ErrorCodes::DATA_TYPE_CANNOT_BE_USED_IN_TABLES);
}
void StorageFactory::registerStorage(const std::string & name, Creator creator)
{
if (!storages.emplace(name, std::move(creator)).second)
throw Exception("TableFunctionFactory: the table function name '" + name + "' is not unique",
ErrorCodes::LOGICAL_ERROR);
}
StoragePtr StorageFactory::get(
ASTCreateQuery & query,
const String & data_path,
const String & table_name,
const String & database_name,
Context & local_context,
Context & context,
const NamesAndTypesList & columns,
const NamesAndTypesList & materialized_columns,
const NamesAndTypesList & alias_columns,
const ColumnDefaults & column_defaults,
bool attach,
bool has_force_restore_data_flag) const
{
String name;
ASTs args;
ASTStorage * storage_def = query.storage;
if (query.is_view)
{
if (query.storage)
throw Exception("Specifying ENGINE is not allowed for a View", ErrorCodes::INCORRECT_QUERY);
name = "View";
}
else
{
/// Check for some special types, that are not allowed to be stored in tables. Example: NULL data type.
/// Exception: any type is allowed in View, because plain (non-materialized) View does not store anything itself.
checkAllTypesAreAllowedInTable(columns);
checkAllTypesAreAllowedInTable(materialized_columns);
checkAllTypesAreAllowedInTable(alias_columns);
if (query.is_materialized_view)
{
name = "MaterializedView";
}
else
{
if (!storage_def)
throw Exception("Incorrect CREATE query: ENGINE required", ErrorCodes::ENGINE_REQUIRED);
const ASTFunction & engine_def = *storage_def->engine;
if (engine_def.parameters)
throw Exception(
"Engine definition cannot take the form of a parametric function", ErrorCodes::FUNCTION_CANNOT_HAVE_PARAMETERS);
if (engine_def.arguments)
args = engine_def.arguments->children;
name = engine_def.name;
if ((storage_def->partition_by || storage_def->order_by || storage_def->sample_by || storage_def->settings)
&& !endsWith(name, "MergeTree"))
{
throw Exception(
"Engine " + name + " doesn't support PARTITION BY, ORDER BY, SAMPLE BY or SETTINGS clauses. "
"Currently only the MergeTree family of engines supports them", ErrorCodes::BAD_ARGUMENTS);
}
if (name == "View")
{
throw Exception(
"Direct creation of tables with ENGINE View is not supported, use CREATE VIEW statement",
ErrorCodes::INCORRECT_QUERY);
}
else if (name == "MaterializedView")
{
throw Exception(
"Direct creation of tables with ENGINE MaterializedView is not supported, use CREATE MATERIALIZED VIEW statement",
ErrorCodes::INCORRECT_QUERY);
}
}
}
auto it = storages.find(name);
if (it == storages.end())
throw Exception("Unknown table engine " + name, ErrorCodes::UNKNOWN_STORAGE);
Arguments arguments
{
.engine_name = name,
.engine_args = args,
.storage_def = storage_def,
.query = query,
.data_path = data_path,
.table_name = table_name,
.database_name = database_name,
.local_context = local_context,
.context = context,
.columns = columns,
.materialized_columns = materialized_columns,
.alias_columns = alias_columns,
.column_defaults = column_defaults,
.attach = attach,
.has_force_restore_data_flag = has_force_restore_data_flag
};
return it->second(arguments);
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}
}