Re: trailing junk in numeric literals

On 2020-12-28 21:54, Tom Lane wrote:
> Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> writes:
>> I was surprised to find that this doesn't error:
>> => select 100a;
>> a
>> -----
>> 100
>
>> I suspect this and similar cases used to error before aliases without AS
>> were introduced. But now this seems possibly problematic. Should we
>> try to handle this better?
>
> Meh. I think you'd get more brickbats than kudos if you start insisting
> on a space there.
>
> I'm too lazy to try to decipher the SQL spec right now, but ISTR that
> it insists on whitespace between a numeric literal and an identifier.

Yeah, non-delimiter tokens are supposed to be separated by delimiter tokens.

> So strictly speaking this SQL code is nonstandard anyway. But our
> lexer has always been forgiving about not requiring space if it's
> not logically necessary to separate tokens. I doubt trying to
> change that would improve matters.

Well, the idea is to diagnose potential typos better. But if there is
no interest, then that's fine.