mirror of
https://github.com/ClickHouse/ClickHouse.git
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280 lines
9.5 KiB
C++
280 lines
9.5 KiB
C++
#include <Poco/File.h>
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#include <Poco/FileStream.h>
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#include <DB/Common/escapeForFileName.h>
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#include <DB/IO/WriteBufferFromString.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/DataStreams/MaterializingBlockInputStream.h>
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#include <DB/DataStreams/copyData.h>
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#include <DB/Parsers/ASTCreateQuery.h>
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#include <DB/Parsers/ASTNameTypePair.h>
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#include <DB/Storages/StorageLog.h>
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#include <DB/Storages/StorageSystemNumbers.h>
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#include <DB/Parsers/ParserCreateQuery.h>
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#include <DB/Parsers/formatAST.h>
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#include <DB/Interpreters/InterpreterSelectQuery.h>
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#include <DB/Interpreters/InterpreterCreateQuery.h>
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#include <DB/DataTypes/DataTypeNested.h>
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namespace DB
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{
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InterpreterCreateQuery::InterpreterCreateQuery(ASTPtr query_ptr_, Context & context_)
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: query_ptr(query_ptr_), context(context_)
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{
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}
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StoragePtr InterpreterCreateQuery::execute(bool assume_metadata_exists)
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{
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String path = context.getPath();
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String current_database = context.getCurrentDatabase();
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ASTCreateQuery & create = typeid_cast<ASTCreateQuery &>(*query_ptr);
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String database_name = create.database.empty() ? current_database : create.database;
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String database_name_escaped = escapeForFileName(database_name);
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String table_name = create.table;
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String table_name_escaped = escapeForFileName(table_name);
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String as_database_name = create.as_database.empty() ? current_database : create.as_database;
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String as_table_name = create.as_table;
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String data_path = path + "data/" + database_name_escaped + "/";
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String metadata_path = path + "metadata/" + database_name_escaped + "/" + (!table_name.empty() ? table_name_escaped + ".sql" : "");
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/// CREATE|ATTACH DATABASE
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if (!database_name.empty() && table_name.empty())
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{
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if (create.attach)
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{
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if (!Poco::File(data_path).exists())
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throw Exception("Directory " + data_path + " doesn't exist.", ErrorCodes::DIRECTORY_DOESNT_EXIST);
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}
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else
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{
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if (!create.if_not_exists && Poco::File(metadata_path).exists())
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throw Exception("Directory " + metadata_path + " already exists.", ErrorCodes::DIRECTORY_ALREADY_EXISTS);
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if (!create.if_not_exists && Poco::File(data_path).exists())
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throw Exception("Directory " + data_path + " already exists.", ErrorCodes::DIRECTORY_ALREADY_EXISTS);
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Poco::File(metadata_path).createDirectory();
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Poco::File(data_path).createDirectory();
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}
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if (!create.if_not_exists || !context.isDatabaseExist(database_name))
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context.addDatabase(database_name);
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return StoragePtr();
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}
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SharedPtr<InterpreterSelectQuery> interpreter_select;
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Block select_sample;
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/// Для таблиц типа view, чтобы получить столбцы, может понадобиться sample_block.
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if (create.select && (!create.attach || (!create.columns && (create.is_view || create.is_materialized_view))))
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{
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interpreter_select = new InterpreterSelectQuery(create.select, context);
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select_sample = interpreter_select->getSampleBlock();
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}
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StoragePtr res;
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String storage_name;
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NamesAndTypesListPtr columns = new NamesAndTypesList;
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StoragePtr as_storage;
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IStorage::TableStructureReadLockPtr as_storage_lock;
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if (!as_table_name.empty())
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{
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as_storage = context.getTable(as_database_name, as_table_name);
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as_storage_lock = as_storage->lockStructure(false);
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}
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{
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Poco::ScopedLock<Poco::Mutex> lock(context.getMutex());
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if (!create.is_temporary)
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{
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context.assertDatabaseExists(database_name);
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if (context.isTableExist(database_name, table_name))
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{
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if (create.if_not_exists)
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return context.getTable(database_name, table_name);
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else
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throw Exception("Table " + database_name + "." + table_name + " already exists.", ErrorCodes::TABLE_ALREADY_EXISTS);
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}
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}
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/// Получаем список столбцов
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if (create.columns)
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{
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columns = new NamesAndTypesList(parseColumns(create.columns, context.getDataTypeFactory()));
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}
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else if (!create.as_table.empty())
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columns = new NamesAndTypesList(as_storage->getColumnsList());
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else if (create.select)
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{
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columns = new NamesAndTypesList;
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for (size_t i = 0; i < select_sample.columns(); ++i)
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columns->push_back(NameAndTypePair(select_sample.getByPosition(i).name, select_sample.getByPosition(i).type));
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}
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else
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throw Exception("Incorrect CREATE query: required list of column descriptions or AS section or SELECT.", ErrorCodes::INCORRECT_QUERY);
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/// Даже если в запросе был список столбцов, на всякий случай приведем его к стандартному виду (развернем Nested).
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ASTPtr new_columns = formatColumns(*columns);
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if (create.columns)
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{
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auto it = std::find(create.children.begin(), create.children.end(), create.columns);
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if (it != create.children.end())
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*it = new_columns;
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else
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create.children.push_back(new_columns);
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}
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else
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create.children.push_back(new_columns);
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create.columns = new_columns;
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/// Выбор нужного движка таблицы
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if (create.storage)
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{
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storage_name = typeid_cast<ASTFunction &>(*create.storage).name;
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}
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else if (!create.as_table.empty())
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{
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storage_name = as_storage->getName();
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create.storage = typeid_cast<const ASTCreateQuery &>(*context.getCreateQuery(as_database_name, as_table_name)).storage;
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}
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else if (create.is_temporary)
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{
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storage_name = "Memory";
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ASTFunction * func = new ASTFunction();
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func->name = storage_name;
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create.storage = func;
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}
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else if (create.is_view)
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{
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storage_name = "View";
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ASTFunction * func = new ASTFunction();
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func->name = storage_name;
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create.storage = func;
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}
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else if (create.is_materialized_view)
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{
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storage_name = "MaterializedView";
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ASTFunction * func = new ASTFunction();
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func->name = storage_name;
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create.storage = func;
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}
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else
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throw Exception("Incorrect CREATE query: required ENGINE.", ErrorCodes::ENGINE_REQUIRED);
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res = context.getStorageFactory().get(
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storage_name, data_path, table_name, database_name, context,
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context.getGlobalContext(), query_ptr, columns, create.attach);
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/// Проверка наличия метаданных таблицы на диске и создание метаданных
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if (!assume_metadata_exists && !create.is_temporary)
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{
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if (Poco::File(metadata_path).exists())
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{
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/** Запрос ATTACH TABLE может использоваться, чтобы создать в оперативке ссылку на уже существующую таблицу.
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* Это используется, например, при загрузке сервера.
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*/
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if (!create.attach)
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throw Exception("Metadata for table " + database_name + "." + table_name + " already exists.",
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ErrorCodes::TABLE_METADATA_ALREADY_EXISTS);
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}
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else
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{
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/// Меняем CREATE на ATTACH и пишем запрос в файл.
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ASTPtr attach_ptr = query_ptr->clone();
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ASTCreateQuery & attach = typeid_cast<ASTCreateQuery &>(*attach_ptr);
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attach.attach = true;
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attach.database.clear();
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attach.as_database.clear();
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attach.as_table.clear();
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attach.if_not_exists = false;
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attach.is_populate = false;
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/// Для engine VIEW необходимо сохранить сам селект запрос, для остальных - наоборот
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if (storage_name != "View" && storage_name != "MaterializedView")
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attach.select = nullptr;
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Poco::FileOutputStream metadata_file(metadata_path);
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formatAST(attach, metadata_file, 0, false);
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metadata_file << "\n";
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}
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}
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if (create.is_temporary)
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{
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context.getSessionContext().addExternalTable(table_name, res);
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}
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else
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context.addTable(database_name, table_name, res);
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}
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/// Если запрос CREATE SELECT, то вставим в таблицу данные
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if (create.select && storage_name != "View" && (storage_name != "MaterializedView" || create.is_populate))
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{
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BlockInputStreamPtr from = new MaterializingBlockInputStream(interpreter_select->execute());
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copyData(*from, *res->write(query_ptr));
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}
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return res;
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}
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NamesAndTypesList InterpreterCreateQuery::parseColumns(ASTPtr expression_list, const DataTypeFactory & data_type_factory)
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{
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NamesAndTypesList columns;
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ASTExpressionList & columns_list = typeid_cast<ASTExpressionList &>(*expression_list);
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for (const ASTPtr & ast : columns_list.children)
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{
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const ASTNameTypePair & name_and_type_pair = typeid_cast<const ASTNameTypePair &>(*ast);
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StringRange type_range = name_and_type_pair.type->range;
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columns.push_back(NameAndTypePair(
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name_and_type_pair.name,
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data_type_factory.get(String(type_range.first, type_range.second - type_range.first))));
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}
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columns = *DataTypeNested::expandNestedColumns(columns);
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return columns;
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}
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ASTPtr InterpreterCreateQuery::formatColumns(const NamesAndTypesList & columns)
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{
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ASTPtr columns_list_ptr = new ASTExpressionList;
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ASTExpressionList & columns_list = typeid_cast<ASTExpressionList &>(*columns_list_ptr);
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for (const NameAndTypePair & it : columns)
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{
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ASTPtr name_and_type_pair_ptr = new ASTNameTypePair;
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ASTNameTypePair & name_and_type_pair = typeid_cast<ASTNameTypePair &>(*name_and_type_pair_ptr);
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name_and_type_pair.name = it.name;
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StringPtr type_name = new String(it.type->getName());
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ParserIdentifierWithOptionalParameters storage_p;
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Expected expected = "";
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const char * pos = type_name->data();
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const char * end = pos + type_name->size();
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if (!storage_p.parse(pos, end, name_and_type_pair.type, expected))
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throw Exception("Cannot parse data type.", ErrorCodes::SYNTAX_ERROR);
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name_and_type_pair.type->query_string = type_name;
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columns_list.children.push_back(name_and_type_pair_ptr);
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}
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return columns_list_ptr;
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}
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}
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