xudong963 opened a new issue #1585: URL: https://github.com/apache/arrow-datafusion/issues/1585
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.** Under certain conditions, convert `outer join` to `inner join` to improve performance. **Describe the solution you'd like** During predicate pushdown, if the filter condition (`where`) only references the **non-nullable-side** table, then it can be pushed down. But if the filter condition (`where`) references the **nullable-side** table, it can't be pushed down, things get bad, which leads to performance cracking. Fortunately, if the filtering conditions are **strict**, we can convert the **outer join** to **inner join**, all filter conditions can be pushed down. Broadly speaking, a function, operator, or expression is considered **strict** if the input argument is NULL and the output is either NULL or FALSE. **Describe alternatives you've considered** No **Additional context** AFAIK, Postgres has the feature. -- 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]
