findepi commented on issue #18845: URL: https://github.com/apache/datafusion/issues/18845#issuecomment-3559754855
There is no reason to "transplant" a typed (bound) expression from one schema to some other schema with different input types. Doing so would be treating the expressions as _syntactical_ rather than _semantical_ operations. Outside of initial SQL plan building (where expressions are constructed syntactical and then applied to a plan), the expression type does not change throughout the planning and optimization process. That's why I think about this in the terms of [typed expressions](https://github.com/apache/datafusion/issues/12604) rather than "caching data type and nullability". However, I can also see how _caching_ may look more approachable to instill over existing code base. -- 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]
