more user-friendly
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-17819'>FLINK-17819</a>] -         Yarn error unhelpful when forgetting HADOOP_CLASSPATH
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-17920'>FLINK-17920</a>] -         Add the Python example of Interval Join in Table API doc
</li>
<li>[<a href='https://issues.apache.org/jira/browse/FLINK-17945'>FLINK-17945</a>] -         Improve error reporting of Python CI tests
</li>
<li>[<a href='https://issues.apache.org