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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 (view raw or flat)
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

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Next:From: Benjamin AdidaDate: 2000-04-02 21:47:25
Subject: Re: 7.0 release notes should call out incompatiblechanges more clearly
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Subject: Re: Call for porting reports

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