-- Best regards, Ilia Evdokimov, Tantor Labs LLC, https://tantorlabs.com/
Would it make sense to add an `enable_uniquekeys GUC`, enabled by
default? UniqueKeys can eliminate DISTINCT/GROUP BY steps and mark joins
as inner-unique, so an incorrect uniqueness proof could affect query
results. A switch would help diagnose regressions and temporarily
disable the optimization if an issue is found. Eager aggregation and
self-join elimination already have such switches:
`enable_eager_aggregate` and `enable_self_join_elimination`.
