Hi Ashtosh and hackers,
> >Some of those instances are for plan stability, all of which need not be > replicated. But some of them explicitly test sort based grouping. For rest > of them hash based plan seems to be the best one, so explicit > enable_groupagg = false is not needed. We will need some test to test the > switch though. > > Thanks for your advice. I'll create a regression test and send a new patch > to -hackers in my next email. > I created a regression test to check the enable_groupagg parameter in the new patch. To ensure plan stability, I disabled parallel query by setting the max_parallel_* parameters to 0. Any feedback is welcome. Please see the attached file. Thanks, Tatsuro Yamada
0001-Add-new-GUC-parameter-enable_groupagg-WIP-r2.patch
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