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ClickHouse v20.3.20.6 Release Notes

Release Date: 2020-10-09 // over 3 years ago

  • 🐛 Bug Fix

    • 🚚 Mutation might hang waiting for some non-existent part after MOVE or REPLACE PARTITION or, in rare cases, after DETACH or DROP PARTITION. It's fixed. #15724, #15537 (tavplubix).
    • 🛠 Fix hang of queries with a lot of subqueries to same table of MySQL engine. Previously, if there were more than 16 subqueries to same MySQL table in query, it hang forever. #15299 (Anton Popov).
    • 🛠 Fix 'Unknown identifier' in GROUP BY when query has JOIN over Merge table. #15242 (Artem Zuikov).
    • 🛠 Fix to make predicate push down work when subquery contains finalizeAggregation function. Fixes #14847. #14937 (filimonov).
    • 🚚 Concurrent ALTER ... REPLACE/MOVE PARTITION ... queries might cause deadlock. It's fixed. #13626 (tavplubix).