presto-main/src/main/java/io/prestosql/spiller/FileSingleStreamSpiller.java/FileSingleStreamSpiller/close
class FileSingleStreamSpiller:    @Override
    public void close()
    {
        closer.register(localSpillContext);
        closer.register(() -> memoryContext.setBytes(0));
        try {
            closer.close();
        }
        catch (IOException e) {
            throw new PrestoException(GENERIC_INTERNAL_ERROR, "Failed to close spiller", e);
        }
    }