fix(samples): dataset getcreatetime (#866)

Author: Praful Makani

samples/snippets/src/main/java/com/example/bigquery/ResourceCleanUp.java

@@ -47,13 +47,13 @@ public static void main(String[] args) {
  // clean up stale test datasets
  Page<Dataset> datasets = bigquery.listDatasets(PROJECT_ID, DatasetListOption.pageSize(1000));
  for (Dataset dataset : datasets.getValues()) {
+ dataset = dataset.reload();
  String datasetName = dataset.getDatasetId().getDataset();
  if ((datasetName.contains("CREATE_DATASET_AWS_TEST_")
- || datasetName.contains("MY_DATASET_")
- || datasetName.contains("gcloud_test_")
- || datasetName.contains("SHARED_DATASET_TEST_"))
- // && dataset.getCreationTime() > sixHourAgo
- ) {
+ || datasetName.contains("MY_DATASET_")
+ || datasetName.contains("gcloud_test_")
+ || datasetName.contains("SHARED_DATASET_TEST_"))
+ && dataset.getCreationTime() > sixHourAgo) {
  System.out.format("\tDeleting Dataset: %s\n", datasetName);
  bigquery.delete(
  DatasetId.of(PROJECT_ID, datasetName), BigQuery.DatasetDeleteOption.deleteContents());