| From: | Greg Stark <stark(at)mit(dot)edu> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | "David E(dot) Wheeler" <david(at)justatheory(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Add hint for function named "is" |
| Date: | 2016-08-12 13:40:46 |
| Message-ID: | CAM-w4HOzC1vehF4XN5wEA_BiYYa_jMxDcN401RH6UTYq30eDzw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Aug 11, 2016 at 10:54 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> I think what is happening
> in the trouble case is that since IS has lower precedence than Op, the
> grammar decides it ought to resolve || as a postfix operator, and then
> it effectively has
> ('x' ||) IS ...
> which leaves noplace to go except IS NULL and other IS-something syntaxes.
I wonder whether it's really worth keeping postfix operators. They
seem to keep causing these kinds of headaches and I wonder how much
the grammar tables would be simplified by removing them.
--
greg
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