| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "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: | 2016-08-13 00:54:21 |
| Message-ID: | 4124.1471049661@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Greg Stark <stark(at)mit(dot)edu> writes:
> On Fri, Aug 12, 2016 at 7:40 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> pointing out that "SELECT 42 ISNULL" is now ambiguous. Since ISNULL
>> is nonstandard, maybe dropping support for it would be feasible.
> Isn't ISNULL one of the lexical tricks we used to effectively give
> bison two token lookahead?
No, it's a SQL-exposed feature, though I think it's just there for
compatibility with some random other DBMS. See also NOTNULL.
regards, tom lane
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