icexelloss commented on PR #34288:
URL: https://github.com/apache/arrow/pull/34288#issuecomment-1442462063

   @westonpace I am working on the substrait producer side of this - IIUC, the 
producer should generate sth like this?
   ```
   extension_uris {
     extension_uri_anchor: 1
   }
   extension_uris {
     extension_uri_anchor: 2
     uri: "urn:arrow:substrait_simple_extension_function"
   }
   extensions {
     extension_function {
       extension_uri_reference: 1
       function_anchor: 1
       name: "multiply"
     }
   }
   extensions {
     extension_function {
       extension_uri_reference: 2
       function_anchor: 2
       name: "my_udf"
     }
   }
   ```
   


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