| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Zoltan Boszormenyi <zb(at)cybertec(dot)at> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Martijn van Oosterhout <kleptog(at)svana(dot)org>, List pgsql-patches <pgsql-patches(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>, Bruce Momjian <bruce(at)momjian(dot)us> |
| Subject: | Re: [HACKERS] parser dilemma |
| Date: | 2007-04-21 08:06:39 |
| Message-ID: | 20845.1177142799@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Zoltan Boszormenyi <zb(at)cybertec(dot)at> writes:
> Andrew Dunstan rta:
>> Zoltan Boszormenyi wrote:
>>> On the other hand, marking GENERATED as %right
>>> solves this issue. I hope it's an acceptable solution.
>>
>> If anything I should have thought it would be marked %nonassoc.
> That works, too.
[ a bit alarmed... ] This is only going to be an acceptable solution
if you can explain *exactly why* it works. The general story with
associativity/precedence declarations is that you are making bison
resolve ambiguous situations in particular ways. If you don't have a
100% clear understanding of what the ambiguity is and why this is the
right way to resolve it, you are probably creating a bigger problem.
regards, tom lane
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