|From:||Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>|
|To:||Heikki Linnakangas <hlinnaka(at)iki(dot)fi>|
|Subject:||Re: eval_const_expresisions and ScalarArrayOpExpr|
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Heikki Linnakangas <hlinnaka(at)iki(dot)fi> writes:
> On 05/11/2017 06:21 PM, Tom Lane wrote:
>> Yeah, I think it's a lack-of-round-tuits situation. Your patch reminds
>> me of a more ambitious attempt I made awhile back to reduce the amount
>> of duplicative boilerplate in eval_const_expressions. I think I wrote
>> it during last year's beta period, stashed it because I didn't feel like
>> arguing for applying it right then, and then forgot about it.
> Hmph, now we're almost in beta period again. :-(.
Actually, I now remember that I wrote that while at Salesforce (because
they'd run into the problem that constant ArrayRef expressions weren't
simplified). So that means it's been languishing in a git branch for
*two* years. I'm kind of inclined to push it before it gets forgotten
Looking at the patch, it still seems solid, but I remember that one
thing I was concerned about was whether the more generalized code
was any slower. Not sure about a good test case to measure that
though --- const-simplification isn't a large chunk of most workloads.
regards, tom lane
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