presto-main/src/main/java/io/prestosql/spiller/FileHolder.java/FileHolder/close
class FileHolder:    @Override
    public synchronized void close()
    {
        if (deleted) {
            return;
        }
        deleted = true;

        try {
            Files.delete(filePath);
        }
        catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }