[GitHub] [airflow] m1racoli opened a new pull request #5970: [AIRFLOW-2923][AIRFLOW-1784] Implement LatestOnlyOperator as BaseBranchOperator

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m1racoli opened a new pull request #5970: [AIRFLOW-2923][AIRFLOW-1784] Implement LatestOnlyOperator as BaseBranchOperator
URL: https://github.com/apache/airflow/pull/5970
 
 
   LatestOnlyOperator is a special case of a BranchOperator, thus it should inherit from it.
   This fixes an issue where the skipping behaviour of LatestOnlyOperator is inconsistent with other operators,
   by forcefully skipping all downstream tasks recursively ignoring trigger rules.
   
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-2923
     - https://issues.apache.org/jira/browse/AIRFLOW-1784 
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   LatestOnlyOperator is a special case of a BranchOperator, thus it should inherit from it.
   This fixes an issue where the skipping behaviour of LatestOnlyOperator is inconsistent with other operators by forcefully skipping all downstream tasks recursively, ignoring trigger rules.
   
   ### Tests
   
   - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   Extended `tests.operators.test_latest_only_operator.py` to cover downstream children with trigger rules. Furthermore fixed the test to not skip task in externally triggered DagRuns.
   
   ### Commits
   
   - [x] 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
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [x] Passes `flake8`
   

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