presto-main/src/main/java/io/prestosql/operator/WorkProcessorPipelineSourceOperator.java/WorkProcessorPipelineSourceOperator/getOperatorInfo
class WorkProcessorPipelineSourceOperator:    @Nullable
    private OperatorInfo getOperatorInfo(WorkProcessorOperatorContext context)
    {
        WorkProcessorOperator operator = context.operator;
        if (operator != null) {
            return operator.getOperatorInfo().orElse(null);
        }

        return context.finalOperatorInfo;
    }