SubhamSinghal opened a new issue, #21596: URL: https://github.com/apache/datafusion/issues/21596
### Is your feature request related to a problem or challenge? [Discussion thread](https://github.com/apache/datafusion/pull/21479#discussion_r3068891661) The `WindowTopN` physical optimizer rule currently skips `FilterExec` nodes that have an embedded projection (`filter.projection().is_some()`). This happens when `ProjectionPushdown` runs before `WindowTopN` and embeds a projection into the `FilterExec`. ```rust // Don't handle filters with projections if filter.projection().is_some() { return None; } ``` ### Describe the solution you'd like Extend WindowTopN to handle FilterExec with embedded projections. This would require: 1. Extracting the projection mapping from FilterExec 2. Resolving the window column index through the projection (mapping projected column indices back to the original schema) 3. Carrying the projection forward into the replacement plan (either re-wrapping PartitionedTopKExec with a ProjectionExec, or embedding the projection) ### Describe alternatives you've considered _No response_ ### 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]
