Re: PL/pgSQL RENAME bug?

Bruce Momjian wrote:

Digging into it now, I remember why it is there. In the
Oracle world, someone can declare a trigger that references
to NEW or OLD by other names. This RENAME was a workaround so
one doesn't need to change the whole trigger body, but just
adds a line in the DECLARE section doing the job.

Therefore, I think removal is not such a good idea. Fixing it
properly will take a little longer as I am a little busy at
the moment.

Jan

> Jan, seems no one has commented on this. Patch?
>
> Jan Wieck wrote:
> > Tom Lane wrote:
> > > "Command Prompt, Inc." <pgsql-hackers(at)commandprompt(dot)com> writes:
> > > > Mainly, the existing documentation on the RENAME statement seems
> > > > inaccurate; it states that you can re-name variables, records, or
> > > > rowtypes. However, in practice, our tests show that attempting to RENAME
> > > > valid variables with:
> > > > RENAME varname TO newname;
> > > > ...yeilds a PL/pgSQL parse error, inexplicably. If I try the same syntax
> > > > on a non-declared variable, it actually says "there is no variable" with
> > > > that name in the current block, so...I think something odd is happening. :)
> > >
> > > Yup, this is a bug. The plpgsql grammar expects varname to be a T_WORD,
> > > but in fact the scanner will only return T_WORD for a name that is not
> > > any known variable name. Thus RENAME cannot possibly work, and probably
> > > never has worked.
> > >
> > > Looks like it should accept T_VARIABLE, T_RECORD, T_ROW (at least).
> > > T_WORD ought to draw "no such variable". Jan, I think this is your turf...
> >
> > Sounds pretty much like that. Will take a look.
> >
> > >
> > > > The RENAME statement seems kind of odd, since it seems that you could just
> > > > as easily declare a general variable with the right name to begin with,
> > >
> > > It seems pretty useless to me too. Perhaps it's there because Oracle
> > > has one?
> >
> > And I don't even remember why I've put it in. Maybe because
> > it's an Oracle thing. This would be a cool fix, removing the
> > damned thing completely. I like that solution :-)
> >
> > Anyone against removal?
> >
> >
> > Jan
> >
> > --
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> --
> Bruce Momjian | http://candle.pha.pa.us
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# It's easier to get forgiveness for being wrong than for being right. #
# Let's break this rule - forgive me. #
#================================================== JanWieck(at)Yahoo(dot)com #

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