presto-main/src/main/java/io/prestosql/operator/WorkProcessorPipelineSourceOperator.java/WorkProcessorPipelineSourceOperator/finishMemoryRevoke
class WorkProcessorPipelineSourceOperator:    @Override
    public void finishMemoryRevoke()
    {
        // TODO: support spill
        throw new UnsupportedOperationException();
    }