| From: | Andreas Seltenreich <andreas+pg(at)gate450(dot)dyndns(dot)org> |
|---|---|
| To: | Mark Dilger <pgsql(at)markdilger(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: PL/pgSQL 'i = i + 1' Syntax |
| Date: | 2006-05-19 00:36:24 |
| Message-ID: | 87zmhevojb.fsf@gate450.dyndns.org |
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| Lists: | pgsql-hackers |
Mark Dilger schrob:
> Tom Lane wrote:
>> No it isn't. The plpgsql scanner treats := and = as *the same token*.
>> They can be interchanged freely. This has nothing to do with the case
>> of modifying a loop variable in particular.
>
> I disagree. If the scanner treated them the same, then
>
> if i := 1 then ...
>
> would work, but it doesn't. The := is rejected in a conditional. Try the
> following code if you don't believe me:
You're confusing the PL/pgSQL scanner with the SQL
scanner. Expressions in PL/pgSQL are handed down to the SQL parser.
regards,
andreas
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