SV: force partition pruning

Fra: David Rowley <dgrowleyml(at)gmail(dot)com> Sendt: 12. maj 2021 02:34

>>
>> ok i think i just may be there is very less data , hence no index scan, no pruning.
>>
>> when i try to force seq_scan off,
>>
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>Unfortunately, no run-time pruning occurred in the above plan.
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>The fact that the above plan uses Append made that possible.
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>I think, for now, the only sure way to get run-time pruning working for this case is to run two separate queries so that the 2nd one can
>perform plan-time pruning.

This is the conclusion I'm taking from this thread and will base my further work on. I was the one asking the original question. A table returning function is my work-hypothesis for now.

>
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>I think if you try to make this work by trying to force the planner's hand, you'll just feel pain when the planner one day has a change of heart and decides to swap the join order on you.
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>David
>
Thank you for the insights into the planner capabilities.

Regards Niels