jgoday commented on issue #554: URL: https://github.com/apache/arrow-datafusion/issues/554#issuecomment-873539365
Hi @Jimexist, Could I take a look at this ? As I understand it: * a **BuiltInWindowFunctionExpr** and a **PartitionEvaluator** has to be implemented under _physical_plan/expressions_, **lag** and **lead** functions should be created with a name, an expression, and the offset/default_value optional arguments. * **return_type_for_built_in** and **signature_for_built_in** should be changed for Lag/Lead (physical_plan/window_functions) * signature has to be a **Signature::OneOf**( (expr -> result), (expr, offset) -> result, (expr, offset, default_value) -> result ) I'm probably missing some details, but would this approach be valid ? -- 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]
