matriv commented on pull request #18058:
URL: https://github.com/apache/flink/pull/18058#issuecomment-1000220873


   Imho, I'm always thinking on the safest side of things, If we allow it then 
we give some flexibility but the issue is always there, and sooner or later we 
will have retractions from the next index for records that are inserted in the 
current index, so I cannot see how that flexibility provides some value over 
the danger of having to deal with those retractions and amend "manually" the 
records. To be more clear, I cannot see a case were we can have retractions 
working smoothly all the time and avoid this issue.


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