Re: Is this a bug ?

On 23/10/2019 16:55, Ron wrote:
> On 10/23/19 10:51 AM, Geoff Winkless wrote:
>> On Wed, 23 Oct 2019 at 16:42, Ravi Krishna <sr_krishna(at)aol(dot)com> wrote:
>>
>>> select count(*) from bugtest where fld1 in ('a','b','c'
>>>                                              'd','e');
>>>
>>> Note the missing comma after 'c'.
>>>
>>> PG takes it a syntactically right SQL and gives 3 as output.
>>>
>>> In SQLServer it errors out SQL Error [102] [S0001]: Incorrect syntax
>>> near 'd'.
>>>
>>> Can't believe this bug was never found before.  We ended up wasting
>>> lot of time to figure this out.
>> Simplify:
>>
>> select 'a'
>> db-# 'b';
>>   ?column?
>> ----------
>>   ab
>> (1 row)
>>
>> This is not a bug.
>>
>> https://www.postgresql.org/docs/9.2/sql-syntax-lexical.html
>>
>> Two string constants that are only separated by whitespace with at
>> least one newline are concatenated and effectively treated as if the
>> string had been written as one constant.
>
> Then -- since the 'e' is separated from 'd' by a comma, the result
> should be "4", not "3".
>
> No doubt: it's a bug, no matter what the Pg devs say.
>

Does any record in your test table contain the concatenated 'cd' in
"fld1"? If not, it's working as per specification & documentation.

I can agree that this sounds like one of those idiosyncratic parts of
the ANSI specification that exist only for compatibility with some
ancient practice, but this behaviour is documented.

BTW, can parser behavior be affected by settings this early?

A GUC setting disabling this madness would make sense IMHO...

--
Regards

Fabio Ugo Venchiarutti
OSPCFC Network Engineering Dpt.
Ocado Technology

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