RE: ecpg command does not warn COPY ... FROM STDIN;

Dear Tom, Fujii-san,

> > ISTM that ecpg supports COPY TO STDOUT and includes the regression test
> "copystdout" for it. No?
>
> Oh right.  (Pokes at it...)  It looks like the backend accepts
> "FROM STDOUT" as a synonym for "FROM STDIN", so that's why this
> is checking for both spellings.  But I agree it'd be better
> for the error message to only use the standard spelling.
>
> Also I tried
>
> regression=# copy int4_tbl from program stdin;
> ERROR:  STDIN/STDOUT not allowed with PROGRAM
>
> So we probably don't need to bother with adjusting the check
> to allow that.

To confirm - I have no objections for the decision. I'm also think it is not
an usual grammar. I checked the doc [1] and I could not find "COPY FROM STDOUT".
I.e., first version is enough.

[1]: https://www.postgresql.org/docs/devel/sql-copy.html

Best regards,
Hayato Kuroda
FUJITSU LIMITED