presto-main/src/main/java/io/prestosql/operator/OperatorContext.java/OperatorContext/setNestedOperatorStatsSupplier
class OperatorContext:    public void setNestedOperatorStatsSupplier(Supplier<List<OperatorStats>> nestedOperatorStatsSupplier)
    {
        requireNonNull(nestedOperatorStatsSupplier, "nestedOperatorStatsSupplier is null");
        this.nestedOperatorStatsSupplier.set(nestedOperatorStatsSupplier);
    }