Re: [HACKERS] Runtime Partition Pruning

Hello,

On Thu, Dec 21, 2017 at 6:30 PM, David Rowley
<david(dot)rowley(at)2ndquadrant(dot)com> wrote:
> On 22 December 2017 at 01:43, Beena Emerson <memissemerson(at)gmail(dot)com> wrote:
>>> I wonder if Robert understands the extent of the problem. The patch
>>> will be useful to prune away partitions when the partitioned table is
>>> on the inside of a parameterised nested loop join, but I think we'll
>>> likely get some complaints about PREPARE statements always using a
>>> custom plan. It's going to make this pretty hard to write regression
>>> tests for unless we went and invent some GUC "prefer_generic_plan", or
>>> "generic_plan_cost_multiplier" to provide a way to coax
>>> choose_custom_plan() into not choosing a custom plan. I admit to not
>>> having the answer to this but I don't think we should rule out
>>> discussing possible fixes.
>>
>> I have attached the regression tests I am currently using to check my
>> patch. It has few prepared statements using runtime pruning.
>
> Thanks for sending. Will the tests still pass if you remove the hack
> from choose_custom_plan()?
>

The hack has been removed in the v7 patch sent and yes the tests work
without any additional adjustments.

Thank you,

Beena Emerson

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