Improve DISTINCT query for finding queue names in PostgreSQL #397
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Related issue in Mission Control: rails/mission_control-jobs#160
We use SolidQueue with PostgreSQL and sometimes viewing Mission Control slows the database down due to the
SELECT DISTINCTquery. The discussion in the linked issue suggests using recursive CTE, which seems to have better performance in practice for us.This PR uses recursive CTE for PostgreSQL if it is supported for better performance.