presto-blackhole/src/main/java/io/prestosql/plugin/blackhole/BlackHoleMetadata.java/BlackHoleMetadata/getColumnMetadata
class BlackHoleMetadata:    @Override
    public ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle)
    {
        BlackHoleColumnHandle blackHoleColumnHandle = (BlackHoleColumnHandle) columnHandle;
        return blackHoleColumnHandle.toColumnMetadata();
    }