presto-main/src/main/java/io/prestosql/operator/NestedLoopJoinPagesSupplier.java/NestedLoopJoinPagesSupplier/setPages
class NestedLoopJoinPagesSupplier:    @Override
    public ListenableFuture<?> setPages(NestedLoopJoinPages nestedLoopJoinPages)
    {
        requireNonNull(nestedLoopJoinPages, "nestedLoopJoinPages is null");
        boolean wasSet = pagesFuture.set(nestedLoopJoinPages);
        checkState(wasSet, "pagesFuture already set");
        return pagesNoLongerNeeded;
    }