ryanyuan opened a new pull request #4164: BigQueryHook check if dataset exists URL: https://github.com/apache/incubator-airflow/pull/4164 Add a function to BigQueryHook to check the existence of a dataset. Return True if the dataset exists. Return False if 404 error received. Make sure you have checked _all_ steps below. ### Jira - [ ] My PR addresses the following [Airflow-3318](https://issues.apache.org/jira/browse/AIRFLOW-3318) issues and references them in the PR title. ### Description - [ ] Here are some details about my PR, including screenshots of any UI changes: To check the existence of a dataset in BigQuery, existing BigQueryHook only supports either 1) using get_datasets_list() to get all the datasets and then searching the target dataset from the list; or 2) using get_dataset(). However, with get_dataset(), it raises AirflowException whenever an HttpError received. So it has no capabilities to determine if the dataset exists or not. To solve this issue, I've added a function to return a boolean value representing the existence of the dataset. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: tests.contrib.hooks.test_bigquery_hook:TestDatasetsOperations.test_check_dataset_exists tests.contrib.hooks.test_bigquery_hook:TestDatasetsOperations.test_check_dataset_exists_not_exist ### Commits - [ ] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)": 1. Subject is separated from body by a blank line 1. Subject is limited to 50 characters (not including Jira issue reference) 1. Subject does not end with a period 1. Subject uses the imperative mood ("add", not "adding") 1. Body wraps at 72 characters 1. Body explains "what" and "why", not "how" ### Documentation - [ ] In case of new functionality, my PR adds documentation that describes how to use it. - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added. ### Code Quality - [ ] Passes `flake8`
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