Jeremy Altavilla <jeremyaltavilla(at)gmail(dot)com> writes:
> We have several select statements whose performance is greatly improved by
> deleting some stats from pg_statistic.
You might have better results by setting up some "extended stats" for
the combination of bag_type columns that this query depends on. Per your
description, there's a fair amount of cross-column correlation, which
the planner will not expect without some extended stats to tell it so.
https://www.postgresql.org/docs/10/planner-stats.html#PLANNER-STATS-EXTENDED
regards, tom lane