jrgemignani commented on issue #1691:
URL: https://github.com/apache/age/issues/1691#issuecomment-2013170834

   @mingfang The particular cause for this issue is hard to easily describe, 
especially without getting very technical. Suffice to say, that MERGE (within 
the execution of a MERGE command instance) can't see what it has just created. 
   
   In most cases, this isn't an issue because MERGE only CREATEs what isn't 
already there. However, when it is driven externally, it is possible for it to 
have duplicates for duplicated data. I'm not sure if this is the only case 
where this is possible, though.
   
   I am looking into how to allow MERGE to know prior to inserting a duplicate 
**and** if this can resolve the issue. This may take some time, though, to 
implement.


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