Re: Memory consumed by child SpecialJoinInfo in partitionwise join planning

>>
>> Sorry, I should’ve mentioned that I was interested in seeing cpu times to compare the two approaches. Specifically, to see if the palloc / frees add noticeable overhead.
>
> No problem. Here you go
>
>  tables |  master  | patched  | perc_change
> --------+----------+----------+-------------
>       2 |   477.87 |   492.32 |       -3.02
>       3 |  1970.83 |  1989.52 |       -0.95
>       4 |  6305.01 |  6268.81 |        0.57
>       5 | 19261.56 | 18684.86 |        2.99
>
> +ve change indicates reduced planning time. It seems that the planning time improves as the number of tables increases. But all the numbers are well within noise levels and thus may not show any improvement or deterioration. If you want, I can repeat the experiment.

Thanks.  I also wanted to see cpu time difference between the two
approaches of SpecialJoinInfo allocation -- on stack and on heap.  So
comparing times with the previous version of the patch using stack
allocation and the new one with palloc.  I'm hoping that the new
approach is only worse in the noise range.