Re: 7.0 release notes should call out incompatible changes more clearly

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: 7.0 release notes should call out incompatible changes more clearly
Date: 2000-04-02 21:40:03
Message-ID: 200004022140.RAA13324@candle.pha.pa.us
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

These are all pretty obscure. How do I make them prominent without
really scaring people who don't even know what they are?

> I am aware of at least three non-backward-compatible changes in 7.0,
> ie, things that will break existing applications in perhaps non-obvious
> ways. I think the "Release Notes" document ought to call these out in a
> separate section, rather than expecting people to examine the detailed
> change list and intuit what those brief entries mean to them.
>
> The three I can think of are:
>
> 1. If a GROUP BY item matches both an input column name and a
> select-list label ("AS" name), 7.0 assumes the input column is meant.
> This is compliant with the SQL92 spec. Unfortunately older versions
> made the opposite choice.
>
> 2. SELECT DISTINCT ON syntax has changed --- now need parentheses
> around the item being DISTINCT'ed.
>
> 3. User-defined operator names can't end in "+" or "-" unless they
> also contain ~ ! @ # % ^ & | ` ? $ or :
>
> Any others?
>
> regards, tom lane
>

--
Bruce Momjian | http://www.op.net/~candle
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Benjamin Adida 2000-04-02 21:47:25 Re: 7.0 release notes should call out incompatible changes more clearly
Previous Message Thomas Lockhart 2000-04-02 21:37:43 Re: Call for porting reports