lincoln-lil opened a new pull request, #27022: URL: https://github.com/apache/flink/pull/27022
## What is the purpose of the change As reported in https://issues.apache.org/jira/browse/CALCITE-7192, the following query may produce wrong result: ```sql SELECT STDDEV_POP(salary) FILTER (WHERE salary > 1000) FROM employees; ``` the decomposition for STDDEV_POP will be: ``` SQRT((SUM(x * x) - SUM(x) * SUM(x) / COUNT(x))/ COUNT(x)) ``` for the above example, the `SUM(salary * salary)` lost the filter `salary > 1000`. The fix itself is very simple. ## Brief change log Fix AggregateReduceFunctionsRule and add corresponding tests ## Verifying this change Newly added rule test AggregateReduceFunctionsRuleTest ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with @Public(Evolving): (no) - The serializers: (no ) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
