"We are migrating our analytics db from Mongo to PG but we hit a wall because SELECT COUNT(DISTINCT x)) performs abysmally in Postgres." https://github.com/agg

"We are migrating our analytics db from Mongo to PG but we hit a wall because SELECT COUNT(DISTINCT x)) performs abysmally in Postgres." https://github.com/aggregateknowledge/postgresql-hll https://github.com/aggregateknowledge/postgresql-hll ? or even https://www.periscopedata.com/blog/hyperloglog-in-pure-sql.html https://www.periscopedata.com/blog/hyperloglog-in-pure-sql.h... ?