presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/EvaluateZeroSample.java/EvaluateZeroSample/apply
class EvaluateZeroSample:    @Override
    public Result apply(SampleNode sample, Captures captures, Context context)
    {
        return Result.ofPlanNode(new ValuesNode(sample.getId(), sample.getOutputSymbols(), ImmutableList.of()));
    }