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ClickHouse v20.8.6.6 Release Notes

Release Date: 2020-11-13 // over 3 years ago

  • 🐛 Bug Fix

    • 🛠 Fix rare silent crashes when query profiler is on and ClickHouse is installed on OS with glibc version that has (supposedly) broken asynchronous unwind tables for some functions. This fixes #15301. This fixes #13098. #16846 (alexey-milovidov).
    • 🚚 Now when parsing AVRO from input the LowCardinality is removed from type. Fixes #16188. #16521 (Mike).
    • Fix rapid growth of metadata when using MySQL Master -> MySQL Slave -> ClickHouse MaterializeMySQL Engine, and slave_parallel_worker enabled on MySQL Slave, by properly shrinking GTID sets. This fixes #15951. #16504 (TCeason).
    • 🛠 Fix DROP TABLE for Distributed (racy with INSERT). #16409 (Azat Khuzhin).
    • 🛠 Fix processing of very large entries in replication queue. Very large entries may appear in ALTER queries if table structure is extremely large (near 1 MB). This fixes #16307. #16332 (alexey-milovidov).
    • 🛠 Fixed the inconsistent behaviour when a part of return data could be dropped because the set for its filtration wasn't created. #16308 (Nikita Mikhaylov).
    • 🛠 Fix bug with MySQL database. When MySQL server used as database engine is down some queries raise Exception, because they try to get tables from disabled server, while it's unnecessary. For example, query SELECT ... FROM system.parts should work only with MergeTree tables and don't touch MySQL database at all. #16032 (Kruglov Pavel).