[development] Do not let postgresql hold back great patches

[Edward Z. Yang]

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> Take, for example, that COUNT(*) is _really_ fast on MySQL + MyISAM,
> but is slow on just about every other DB.  So, replace it with
> $db->count(), which does an SQL COUNT(*) on MySQL + MyISAM, but uses
> some other technique on other databases.  The programmer no longer
> cares _how_ such a thing gets done, he only cares that he wants to
> know how many rows are in a particular query

The primary problem with this approach (at least in my experience) is
that the moment you need to create queries that are even somewhat
complicated the abstraction layer proves to be insufficient. Ad hoc
queries are often very useful for performance reasons, but you'll have
to get a PostgreSQL guru to write an equivalent.

Then again, for most people writing SQL performance/complex joins/etc
are not a primary concern...

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