Re: enforcing a plan (in brief)

Tom Lane wrote:
> pgsql(at)mohawksoft(dot)com writes:
> > I think that is sort of arrogant. Look at Oracle, you can give the planner
> > hints in the form of comments.
>
> Arrogant or not, that's the general view of the people who work on the
> planner.
>
> The real issue is not so much whether the planner will always get things
> right --- it won't, and no one imagines that it will ever be perfect.
> The real issue is that we have limited manpower, and designing and
> implementing a useful hint facility is a nontrivial project. (Not to
> mention that maintaining such a thing in the face of frequent,
> fundamental changes to the underlying planner and executor capabilities
> would be an outright nightmare.)

And the user maintenance of updating those hints for every release of
PostgreSQL as we improve the database engine.

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