presto-mongodb/src/main/java/io/prestosql/plugin/mongodb/MongoMetadata.java/MongoMetadata/getColumnMetadata
class MongoMetadata:    @Override
    public ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle)
    {
        return ((MongoColumnHandle) columnHandle).toColumnMetadata();
    }