Re: [HACKERS] Bug in to_timestamp().

From: Arthur Zakirov <a(dot)zakirov(at)postgrespro(dot)ru>
To: Dmitry Dolgov <9erthalion6(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, amul sul <sulamul(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(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>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] Bug in to_timestamp().
Date: 2018-02-12 11:49:45
Message-ID: 20180212114943.GA6629@zakirov.localdomain
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Hello,

On Fri, Feb 09, 2018 at 04:31:14PM +0100, Dmitry Dolgov wrote:
> I went through this thread, and want to summarize a bit:
>
> From what I see this patch addresses most important concerns that were
> mentioned in the thread, i.e. to make `to_timestamp` less confusing and be
> close to Oracles behavior. The code itself looks clear and sufficient, with the
> required documentation and green tests.

Thank you for reviewing!

> Looks like there are just two questions left so far:
>
> * I've noticed what I think a difference between current that was introduced in
> this patch and Oracle. In the following case we can have any number of spaces
> after a separator `+` in the input string
> ...
> But no spaces before it (it actually depends on how many separators do we have
> in the format string)
> ...
> Judging from this http://rextester.com/l/oracle_online_compiler in Oracle it's
> possible to have any number of spaces before or after `+` independently from
> the number of separators in an input string. Is it intended?

Yes, I somehow missed it. I changed the behaviour of separator
characters in format string. They are greedy now and eat whitespaces
before a separator character in an input string. I suppose that there
should be no such problems as in [1].

> * About usage of locale dependent functions e.g. `isalpha`. Yes, looks like
> it's better to have locale-agnostic implementation, but then I'm confused - all
> functions except `isdigit`/`isxdigit` are locale-dependent, including
> `isspace`, which is also in use.

I returned is_separator_char() function for now.

1 - https://www.postgresql.org/message-id/20180112125848.GA32559%40zakirov.localdomain

--
Arthur Zakirov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company

Attachment Content-Type Size
0001-to-timestamp-format-checking-v11.patch text/plain 12.6 KB

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