18d85e9b8a
Commit 7cb0a423f overlooked that the multi-level partition test table pagg_tab_ml still had an exactly even row split at its upper level of partitioning, so that some of the sub-aggregation plan steps still had exactly equal costs, leading to plan instability. Tweak the partition boundaries some more to make the row distribution unequal at both levels. This leads to more changes in the "expected" plan order than the previous round, but it seems fine. (Actually, I'm surprised that this didn't affect even more plans in this test: looking at the underlying costs shows that some of the parallel plan groups are *not* getting sorted by cost. Bug?) Per buildfarm member lousyjack, https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=lousyjack&dt=2020-04-04%2021%3A03%3A04 Discussion: https://postgr.es/m/24467.1585838693@sss.pgh.pa.us
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