Evaluating user-defined conditions

[Roger Bell_West]

On Tue, Jun 10, 2014 at 11:59:57AM +0100, Chris Jack wrote:
>Can I suggest you consider including some rudimentary idea of "cost"
>when you're deciding whether to allow the query to run or not. "Cost"
>could be in terms of anticipated rows returned and/or total
>anticipated CPU time.

Yeah, it shouldn't be that hard to write code to evaluate an
expression and work out how long it'll take to run.

:-)

R