Re: =ANY(ARRAY) vs =ANY(ARRAY(expr)) performance

Okay, increasing the collection of statistics seems to have helped. I used
`ALTER TABLE report ALTER COLUMN reporter_id SET STATISTICS 10000` and now
queries which previously didn't finish at all now finish in < 1 ms.

The following gave me the hint:

“The amount of information stored in `pg_statistic` by `ANALYZE`, in
particular the maximum number of entries in
the `most_common_vals` and `histogram_bounds` arrays for each column, can
be set on a column-by-column basis using the `ALTER TABLE SET
STATISTICS` command, or globally by setting the default_statistics_target
configuration variable. The default limit is presently 100 entries. *Raising
the limit might allow more accurate planner estimates to be made,
particularly for columns with irregular data distributions*, at the price
of consuming more space in `pg_statistic` and slightly more time to compute
the estimates. Conversely, a lower limit might be sufficient for columns
with simple data distributions.”

— https://www.postgresql.org/docs/current/planner-stats.html

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