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

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
>

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