andygrove commented on PR #2704:
URL: 
https://github.com/apache/datafusion-comet/pull/2704#issuecomment-3498282365

   > Thanks @andygrove
   > 
   > I would also add supported signatures, for instance most recent Concat
   > 
   > ```
   >   // Carry out the native execution for concat(string*)
   >   // falling back to Spark for other input types
   >   override def getSupportLevel(expr: Concat): SupportLevel = {
   >     if (expr.children.forall(_.dataType == DataTypes.StringType)) {
   >       Compatible()
   >     } else {
   >       Incompatible(Some(unsupportedReason))
   >     }
   >   }
   > }
   > ```
   
   Thanks, I added a section on this


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