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ClickHouse v20.8.4.11 Release Notes

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

  • 🐛 Bug Fix

    • 🛠 Fix the order of destruction for resources in ReadFromStorage step of query plan. It might cause crashes in rare cases. Possibly connected with #15610. #15645 (Nikolai Kochetov).
    • 🛠 Fixed Element ... is not a constant expression error when using JSON* function result in VALUES, LIMIT or right side of IN operator. #15589 (tavplubix).
    • 🛠 Prevent the possibility of error message Could not calculate available disk space (statvfs), errno: 4, strerror: Interrupted system call. This fixes #15541. #15557 (alexey-milovidov).
    • Significantly reduce memory usage in AggregatingInOrderTransform/optimize_aggregation_in_order. #15543 (Azat Khuzhin).
    • 🚚 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. #15537 (tavplubix).
    • 🛠 Fix bug when ILIKE operator stops being case insensitive if LIKE with the same pattern was executed. #15536 (alesapin).
    • 🛠 Fix Missing columns errors when selecting columns which absent in data, but depend on other columns which also absent in data. Fixes #15530. #15532 (alesapin).
    • 🛠 Fix bug with event subscription in DDLWorker which rarely may lead to query hangs in ON CLUSTER. Introduced in #13450. #15477 (alesapin).
    • Report proper error when the second argument of boundingRatio aggregate function has a wrong type. #15407 (detailyang).
    • 🛠 Fix race condition during MergeTree table rename and background cleanup. #15304 (alesapin).
    • 🛠 Fix rare race condition on server startup when system.logs are enabled. #15300 (alesapin).
    • 🛠 Fix MSan report in QueryLog. Uninitialized memory can be used for the field memory_usage. #15258 (alexey-milovidov).
    • 🛠 Fix instance crash when using joinGet with LowCardinality types. This fixes https://github.com/ClickHouse/ClickHouse/issues/15214. #15220 (Amos Bird).
    • 🛠 Fix bug in table engine Buffer which doesn't allow to insert data of new structure into Buffer after ALTER query. Fixes #15117. #15192 (alesapin).
    • Adjust decimals field size in mysql column definition packet. #15152 (maqroll).
    • 🛠 We already use padded comparison between String and FixedString (https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/FunctionsComparison.h#L333). This PR applies the same logic to field comparison which corrects the usage of FixedString as primary keys. This fixes https://github.com/ClickHouse/ClickHouse/issues/14908. #15033 (Amos Bird).
    • If function bar was called with specifically crafter arguments, buffer overflow was possible. This closes #13926. #15028 (alexey-milovidov).
    • 🛠 Fixed Cannot rename ... errno: 22, strerror: Invalid argument error on DDL query execution in Atomic database when running clickhouse-server in docker on Mac OS. #15024 (tavplubix).
    • Now settings number_of_free_entries_in_pool_to_execute_mutation and number_of_free_entries_in_pool_to_lower_max_size_of_merge can be equal to background_pool_size. #14975 (alesapin).
    • 🛠 Fix to make predicate push down work when subquery contains finalizeAggregation function. Fixes #14847. #14937 (filimonov).
    • 🛠 Publish CPU frequencies per logical core in system.asynchronous_metrics. This fixes https://github.com/ClickHouse/ClickHouse/issues/14923. #14924 (Alexander Kuzmenkov).
    • 🛠 Fixed .metadata.tmp File exists error when using MaterializeMySQL database engine. #14898 (Winter Zhang).
    • 🛠 Fix a problem where the server may get stuck on startup while talking to ZooKeeper, if the configuration files have to be fetched from ZK (using the from_zk include option). This fixes #14814. #14843 (Alexander Kuzmenkov).
    • 🛠 Fix wrong monotonicity detection for shrunk Int -> Int cast of signed types. It might lead to incorrect query result. This bug is unveiled in #14513. #14783 (Amos Bird).
    • 🛠 Fixed the incorrect sorting order of Nullable column. This fixes #14344. #14495 (Nikita Mikhaylov).

    👌 Improvement

    • Now it's possible to change the type of version column for VersionedCollapsingMergeTree with ALTER query. #15442 (alesapin).