From: Tom Lane <tgl@sss.pgh.pa.us>
To: 谭忠涛 <zhongtao.tan@seaboxdata.com>
Cc: David G. Johnston <david.g.johnston@gmail.com>
Cc: pgsql-bugs <pgsql-bugs@lists.postgresql.org>
Subject: Re: 回复：Re: The != and +/- signs are joined together as an operator
Date: Wed, 19 Mar 2025 21:44:43 -0400
Message-ID: <900145.1742435083@sss.pgh.pa.us> (raw)
In-Reply-To: <tencent_66B9FBC77B1326A007855EB1@qq.com>
References: <tencent_66B9FBC77B1326A007855EB1@qq.com>
"=?utf-8?B?6LCt5b+g5rab?=" <zhongtao.tan@seaboxdata.com> writes:
> But "!=" is not the same as "<>"
> 1!=-1, "!=-" as a whole is treated as an operator, not as an operator "!=" -1, but in 1<>-1, it is treated as "<>" -1 instead of "<>-" as a whole is treated as an operator
> I think "!=" and "<>" should be treated in the same way
[ shrug... ] It's not going to happen. The PG project's position,
as stated in the docs I pointed you to, is that you should write a
space between adjacent operators. The SQL spec thinks differently,
so we've made sure that you can leave out space between operators
that are defined in the SQL standard, but that's as far as we'll go.
There are too many existing operators, both within PG core and
elsewhere, that would be broken by changing those rules now.
regards, tom lane
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To: pgsql-bugs@postgresql.org
Cc: tgl@sss.pgh.pa.us, zhongtao.tan@seaboxdata.com, david.g.johnston@gmail.com, pgsql-bugs@lists.postgresql.org
Subject: Re: 回复：Re: The != and +/- signs are joined together as an operator
In-Reply-To: <900145.1742435083@sss.pgh.pa.us>
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