The correlation statistic tells the planner how closely the physical row order matches the column's sort order. A value near 1.0 means sequential access patterns - making index scan cheaper because the next row is likely on the same or adjacent page. For time-series data like created_at where rows are inserted chronologically, correlation is typically very high.
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Breaking a Long-Standing Barrier: 2-ε Approximation for Steiner ForestAli Ahmadi, University of Maryland; et al.Iman Gholami, University of Maryland
Начальника Генштаба ВСУ обвинили в халатном исполнении служебных обязанностей20:27