In another message to this list, I saw a reference to http://phoenix-hbase.blogspot.com.es/2013/04/how-to-add-your-own-built-in-function.html?m=1, where it’s shown how to create a scalar built-in function in Phoenix. I’m surprised because I though UDF’s were not in the roadmap, according to this Jira https://issues.apache.org/jira/browse/PHOENIX-538 where it says “until coprocessors have a way to run inside their own sandbox, we'd want to have a way to disable this feature”. I think this feature is very interesting, so I’m wondering whether this built-in functions are executed in the client or in the Region Servers as coprocessors. If that’s the case, are they running in a sandboxed environment to protect the Region Servers?
Thanks a lot for the information,
Juan Rodríguez Hortalá