davidradl commented on PR #26630:
URL: https://github.com/apache/flink/pull/26630#issuecomment-2940739656

   @fsk119 Please could you write down in the Flip or the Jira the motivation 
for reusing the lookupJoin operator for the ML_PREDICT. I am curious what the 
join key means for ML_PREDICT. Does this mean that there always has to be 
something to join on in order to be able to issue the ML_PREDICT call? 
   When I syntax like this , I do not immediately see what the join key would 
be: 
   ```
   SELECT f1, f2, label FROM
   ML_PREDICT(
     input => `my_data`,
     model => `classifier_model`,
     args => DESCRIPTOR(f1, f2)
   )
   ```


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