gabotechs opened a new issue, #20778: URL: https://github.com/apache/datafusion/issues/20778
### Is your feature request related to a problem or challenge? https://github.com/apache/datafusion/pull/19761 introduced buffering on the probe side of a HashJoinExec node as an optional feature for eagerly fetching the probe side. While this demonstrates speed in benchmarks, it does not play well with dynamic filters, as the buffering behavior does not let the dynamic filter produce any meaningful filter, therefore, fetching more than whats necessary. For this reason, hash join buffering on the probe side is an optional feature. ### Describe the solution you'd like It would be nice to detect when a dynamic filter exists below the BufferExec node and either: - disable the buffering behavior - hold a reference to the dynamic filter and be smart about whether it's worth waiting for it or not ### Describe alternatives you've considered Just leave the hash join buffering off by default forever ### Additional context _No response_ -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
