https://cloud.google.com/bigquery/docs/paging-results#paging_through_query_results

results.getNextPage() will return results from second page and might return NPE in some cases

We need to add update this sample to ensure:

1. show first page of results;
2. stop paging when we reach the last page (to avoid NPE).

https://cloud.google.com/bigquery/docs/paging-results#paging

We may want to either update this sample to get rid of iterateAll() of include comments to explain how it works with pagination.