Tom Lane wrote:
... but when it is TRUE, there should be a notice, same as there is in
SELECT.  UPDATE should produce such a notice too, IMHO.  Probably we
omitted the message originally because there was no way to avoid it
in a DELETE, but now there will be.

Well, my previous message described why I'm not sure that this line of reasoning is correct. I think the only really proper configuration is add_missing_from=false and an explicit USING/FROM list. Just about the only reason to enable add_missing_from would be for compatibility with previous releases of PostgreSQL -- and that "compatible" behavior is not to issue a warning for UPDATE and DELETE in this situation. If the user deliberately enables add_missing_from, I'm inclined to trust them that they know what they're doing.


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