osipovartem commented on issue #12907: URL: https://github.com/apache/datafusion/issues/12907#issuecomment-5558807571
I would like to pick up the UNPIVOT half as a focused first PR. I maintain a downstream implementation, but rather than revive the previous 1,000+ line combined change, I plan to split it into: 1. a reusable `LogicalPlanBuilder::unpivot` transformation, 2. a thin DataFrame API wrapper, and 3. SQL `TableFactor::Unpivot` lowering with focused tests. The implementation will use ordinary projections + `UNION ALL`, avoid dependencies on scalar UDFs, cover INCLUDE/EXCLUDE NULLS, aliases, type coercion, and validation, and leave PIVOT for a separate follow-up. I will preserve attribution to the prior work where code is reused. -- 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]
