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Creating a bunch of non-overlapping partial indexes is generally a bad idea, so add an example saying not to do that. Back-patch to v10. Before that, the alternative of using (real) partitioning wasn't available, so that the tradeoff isn't quite so clear cut. Discussion: https://postgr.es/m/CAKVFrvFY-f7kgwMRMiPLbPYMmgjc8Y2jjUGK_Y0HVcYAmU6ymg@mail.gmail.com