presto-main/src/main/java/io/prestosql/operator/HashBuilderOperator.java/HashBuilderOperator/finishMemoryRevoke
class HashBuilderOperator:    @Override
    public void finishMemoryRevoke()
    {
        checkState(finishMemoryRevoke.isPresent(), "Cannot finish unknown revoking");
        finishMemoryRevoke.get().run();
        finishMemoryRevoke = Optional.empty();
    }