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Clarify the relationship between find_em_expr_usable_for_sorting_rel and prepare_sort_from_pathkeys, i.e. what restrictions need to be shared between those two places. Author: James Coleman Reviewed-by: Tomas Vondra Backpatch-through: 13 Discussion: https://postgr.es/m/CAAaqYe8cK3g5CfLC4w7bs%3DhC0mSksZC%3DH5M8LSchj5e5OxpTAg%40mail.gmail.com