```
Caught exception while loading metadata: Code: 501, e.displayText() = DB::Exception: Cannot create MySQL database, because Code: 393, e.displayText() 
= DB::Exception: There is no query, Stack trace (when copying this message, always include the lines below):

0. /home/milovidov/ClickHouse/build_gcc9/../contrib/poco/Foundation/src/Exception.cpp:27: Poco::Exception::Exception(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, 
int) @ 0x1074687c in /usr/bin/clickhouse
1. /home/milovidov/ClickHouse/build_gcc9/../src/Common/Exception.cpp:37: DB::Exception::Exception(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int) @ 0x7867c29 in
 /usr/bin/clickhouse
2. /home/milovidov/ClickHouse/build_gcc9/../contrib/libcxx/include/string:2134: DB::Context::getQueryContext() const (.cold) @ 0xd202416 in /usr/bin/clickhouse
3. /home/milovidov/ClickHouse/build_gcc9/../src/Interpreters/Context.h:457: DB::DatabaseConnectionMySQL::DatabaseConnectionMySQL(DB::Context const&, std::__1::basic_string<char, std::__1::char_traits<char>, std:
:__1::allocator<char> > const&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, DB::ASTStorage const*, std::__1::basic_string<char, std::__1::char_traits<char>, std:
:__1::allocator<char> > const&, mysqlxx::Pool&&) @ 0xd408d7c in /usr/bin/clickhouse
```

```
ATTACH DATABASE conv_main
ENGINE = MySQL('hostname:3306', 'db', 'metrika', 'password')
```
{
    const auto & create_query = std::make_shared<ASTCreateQuery>();
    create_query->database = getDatabaseName();
    create_query->set(create_query->storage, database_engine_define);
    return create_query;
}
void DatabaseConnectionMySQL::fetchTablesIntoLocalCache(const Context & context) const
{
    const auto & tables_with_modification_time = fetchTablesWithModificationTime();
    destroyLocalCacheExtraTables(tables_with_modification_time);
    fetchLatestTablesStructureIntoCache(tables_with_modification_time, context);
}
void DatabaseConnectionMySQL::destroyLocalCacheExtraTables(const std::map<String, UInt64> & tables_with_modification_time) const
{
    for (auto iterator = local_tables_cache.begin(); iterator != local_tables_cache.end();)
    {
        if (tables_with_modification_time.find(iterator->first) != tables_with_modification_time.end())
            ++iterator;
        else
        {
            outdated_tables.emplace_back(iterator->second.second);
            iterator = local_tables_cache.erase(iterator);
        }
    }
}
void DatabaseConnectionMySQL::fetchLatestTablesStructureIntoCache(const std::map<String, UInt64> &tables_modification_time, const Context & context) const