andygrove opened a new issue, #6177: URL: https://github.com/apache/datafusion-comet/issues/6177
**Arity.** `CometNativeUDF.register` installs a Spark catalog stub so that SQL and DataFrame name resolution succeed, and that stub is built from `functions.udf` with a fixed-arity Scala lambda, one case per arity from 0 to 4. A UDF with five or more arguments is rejected at registration. Neither the ABI nor the native adapter has an arity limit; only the stub does. Spark's `UDF5` through `UDF22` interfaces (or building the `ScalaUDF` directly) would remove the cap. **`registerAll`.** A library can export any number of kernels, but each has to be registered by name with its own signature. A `registerAll(spark, libraryPath)` that registered every exported kernel would need the library to report each kernel's signature, which ties into #5597 (derive the return type from the library rather than asking the caller to declare it). Follow-up to #4459. -- 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]
