v.20.4Bug Fix
Fixed Performance for UNION Queries in ClickHouse
Fixed performance for selects with UNION caused by wrong limit for the total number of threads. Fixes #12030. #12103 (Nikolai Kochetov).Fixed performance for selects with UNION caused by wrong limit for the total number of threads. Fixes #12030. #12103 (Nikolai Kochetov).