Re: Cost limit.

> Actually I was thinking of something to cut the query off at the pass.  I
> looked through the code, and it does a query plan and uses the one with
> least cost.  So, theoretically, I should be able to hack the code so that
> it will refuse to execute a query if the best query plan has an estimated
> cost of over 100,000 for example.
>
> Some kind of error like:  "Query not executed due to detection of possible
> cross product."
>
> Of course, I'd like to stay away from source hacks, besides It would be
> nice to tune from postgresql.conf as a parameter like max_query_cost.
>
> The source is a bit spaghetti-ish, and I'm having a hard time following
> some of the macros, typedefs and structs.  I don't think I could add
> a feature like this myself.

I don't think our optimizer estimates are that accurate.

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