Confusing remark about UPSERT in fdwhandler.sgml

Confusing remark about UPSERT in fdwhandler.sgml

The following is a remark about UPSERT in fdwhandler.sgml.

     INSERT</> with an ON CONFLICT</> clause does not
     support specifying the conflict target, as remote constraints are not
     locally known. This in turn implies that ON CONFLICT DO
     UPDATE</> is not supported, since the specification is mandatory there.

ISTM that the sentence "as remote constraints are not locally known" is
somewhat confusing, because check constrains on remote tables can be
defined locally in 9.5.  How about "unique constraints or exclusion
constraints on remote tables are not locally known"?  Attached is a
patch for that.

Best regards,
Etsuro Fujita

Re: Confusing remark about UPSERT in fdwhandler.sgml

Re: Confusing remark about UPSERT in fdwhandler.sgml

Re: Confusing remark about UPSERT in fdwhandler.sgml