The query ``` clickhouse-benchmark --max_threads 16 <<< "select WatchID from hits_100m_obfuscated group by WatchID limit 10" ``` will lead to sustained memory usage of 26 GiB despite the fact that the query only takes 4..5 GiB.
The query
will lead to sustained memory usage of 26 GiB despite the fact that the query only takes 4..5 GiB.