Re: [HACKERS] Another oddity in handling of WCO constraints in postgres_fdw

(2018/03/06 1:57), Arthur Zakirov wrote:
> IMHO, it is worth to add more explaining comment into
> deparseReturningList, why it is necessary to merge WCO attributes to
> RETURNING clause. You already noted it in the thread. I think it could
> confuse someone who not very familiar how RETURNING is related with WITH
> CHECK OPTION.

Agreed.  I added a comment to that function.  I think that that comment 
in combination with changes to the FDW docs in the patch would help FDW 
authors understand why that is needed.  Please find attached an updated 
version of the patch.

Thanks for the comments!

Best regards,
Etsuro Fujita