Method getCreateDatabaseQueryImpl

src/Databases/DatabaseOnDisk.cpp:563–593

}

ASTPtr DatabaseOnDisk::getCreateDatabaseQueryImpl() const
{
    auto default_db_disk = getContext()->getDatabaseDisk();
    ASTPtr ast;

    const auto & settings = getContext()->getSettingsRef();
    {
        auto metadata_file_path = DatabaseCatalog::getMetadataFilePath(database_name);
        ast = parseQueryFromMetadata(log, getContext(), default_db_disk, metadata_file_path, true);
        auto & ast_create_query = ast->as<ASTCreateQuery &>();
        ast_create_query.attach = false;
        ast_create_query.setDatabase(database_name);
    }
    if (!ast)
    {
        /// Handle databases (such as default) for which there are no database.sql files.
        /// If database.sql doesn't exist, then engine is Ordinary
        String query = "CREATE DATABASE " + backQuoteIfNeed(database_name) + " ENGINE = Ordinary";
        ParserCreateQuery parser;
        ast = parseQuery(
            parser, query.data(), query.data() + query.size(), "", 0, settings[Setting::max_parser_depth], settings[Setting::max_parser_backtracks]);
    }

    if (!comment.empty())
    {
        auto & ast_create_query = ast->as<ASTCreateQuery &>();
        ast_create_query.set(ast_create_query.comment, make_intrusive<ASTLiteral>(comment));
    }

    return ast;
}

void DatabaseOnDisk::drop(ContextPtr local_context)
{