Re: [HACKERS] Bug in to_timestamp().

From: Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>
To: Artur Zakirov <a(dot)zakirov(at)postgrespro(dot)ru>
Cc: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, amul sul <sulamul(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Alex Ignatov <a(dot)ignatov(at)postgrespro(dot)ru>, Bruce Momjian <bruce(at)momjian(dot)us>, amul sul <sul_amul(at)yahoo(dot)co(dot)in>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] Bug in to_timestamp().
Date: 2018-08-02 18:06:20
Message-ID: CAPpHfdso_Yvbo-EXKD8t3cuAeR7wszPyuWNBdjQLi1NrMt3O5w@mail.gmail.com
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On Thu, Aug 2, 2018 at 6:17 PM Alexander Korotkov
<a(dot)korotkov(at)postgrespro(dot)ru> wrote:
> After some experiments I found that when you mix spaces and separators
> between two fields, then Oracle takes into account only length of last
> group of spaces/separators.
>
> # SELECT to_timestamp('2018- -01 02', 'YYYY---- --- --MM-DD') FROM
> dual2018-01-01 00:00:00 -10:00
> (length of last spaces/separators group is 2)
>
> # SELECT to_timestamp('2018- -01 02', 'YYYY---- --- --MM-DD') FROM dual
> 2018-01-01 00:00:00 -10:00
> (length of last spaces/separators group is 3)
>
> # SELECT to_timestamp('2018- -01 02', 'YYYY---- -- ---MM-DD') FROM dual
> 02.01.2018 00:00:00
> (length of last spaces/separators group is 2)

Ooops... I'm sorry, but I've posted wrong results here. Correct
version is here.

# SELECT to_timestamp('2018- -01 02', 'YYYY---- --- --MM-DD') FROM dual
ORA-01843: not a valid month
(length of last spaces/separators group is 2)

# SELECT to_timestamp('2018- -01 02', 'YYYY---- -- ---MM-DD') FROM dual
02.01.2018 00:00:00
(length of last spaces/separators group is 3)

So length of last group of spaces/separators in the pattern should be
greater or equal to length of spaces/separators in the input string.
Other previous groups are ignored in Oracle. And that seems
ridiculous for me.

------
Alexander Korotkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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