presto-blackhole/src/main/java/io/prestosql/plugin/blackhole/BlackHoleMetadata.java/BlackHoleMetadata/dropTable
class BlackHoleMetadata:    @Override
    public void dropTable(ConnectorSession session, ConnectorTableHandle tableHandle)
    {
        BlackHoleTableHandle blackHoleTableHandle = (BlackHoleTableHandle) tableHandle;
        tables.remove(blackHoleTableHandle.toSchemaTableName());
    }