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ClickHouse/docs/changelogs/v20.8.4.11-lts.md

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ClickHouse release v20.8.4.11-lts FIXME as compared to v20.8.3.18-stable

Improvement

  • Backported in #15569: Now it's possible to change the type of version column for VersionedCollapsingMergeTree with ALTER query. #15442 (alesapin).

Bug Fix

  • Backported in #15017: Fixed the incorrect sorting order of Nullable column. This fixes #14344. #14495 (Nikita Mikhaylov).
  • Backported in #14823: 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).
  • Backported in #15148: 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).
  • Backported in #15251: Fixed segfault in CacheDictionary #14837. #14879 (Nikita Mikhaylov).
  • Backported in #14955: Fixed .metadata.tmp File exists error when using MaterializeMySQL database engine. #14898 (Winter Zhang).
  • Backported in #14987: Publish CPU frequencies per logical core in system.asynchronous_metrics. This fixes #14923. #14924 (Alexander Kuzmenkov).
  • Backported in #14969: Fix to make predicate push down work when subquery contains finalizeAggregation function. Fixes #14847. #14937 (filimonov).
  • Backported in #15053: 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).
  • Backported in #15077: Fix crash in RIGHT or FULL JOIN with join_algorith='auto' when memory limit exceeded and we should change HashJoin with MergeJoin. #15002 (Artem Zuikov).
  • Backported in #15102: 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 (Alexander Tokmakov).
  • Backported in #15056: If function bar was called with specifically crafted arguments, buffer overflow was possible. This closes #13926. #15028 (Alexey Milovidov).
  • Backported in #15049: 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 #14908. #15033 (Amos Bird).
  • Backported in #15142: Fixes Data compressed with different methods in join_algorithm='auto'. Keep LowCardinality as type for left table join key in join_algorithm='partial_merge'. #15088 (Artem Zuikov).
  • Backported in #15208: Adjust decimals field size in mysql column definition packet. #15152 (maqroll).
  • Backported in #15222: 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).
  • Backported in #15405: Fix instance crash when using joinGet with LowCardinality types. This fixes #15214. #15220 (Amos Bird).
  • Backported in #15489: Fix 'Unknown identifier' in GROUP BY when query has JOIN over Merge table. #15242 (Artem Zuikov).
  • Backported in #15281: Fix MSan report in QueryLog. Uninitialized memory can be used for the field memory_usage. #15258 (Alexey Milovidov).
  • Backported in #15402: 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).
  • Backported in #15338: Fix rare race condition on server startup when system.logs are enabled. #15300 (alesapin).
  • Backported in #15334: Fix race condition during MergeTree table rename and background cleanup. #15304 (alesapin).
  • Backported in #15447: Report proper error when the second argument of boundingRatio aggregate function has a wrong type. #15407 (detailyang).
  • Backported in #15505: Fix bug with event subscription in DDLWorker which rarely may lead to query hangs in ON CLUSTER. Introduced in #13450. #15477 (alesapin).
  • Backported in #15550: 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).
  • Backported in #15558: Fix bug when ILIKE operator stops being case insensitive if LIKE with the same pattern was executed. #15536 (alesapin).
  • Backported in #15726: 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 (Alexander Tokmakov).
  • Backported in #15652: Fix 'Database doesn't exist.' in queries with IN and Distributed table when there's no database on initiator. #15538 (Artem Zuikov).
  • Backported in #15629: Significantly reduce memory usage in AggregatingInOrderTransform/optimize_aggregation_in_order. #15543 (Azat Khuzhin).
  • Backported in #15585: 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).
  • Backported in #15666: Fixed Element ... is not a constant expression error when using JSON* function result in VALUES, LIMIT or right side of IN operator. #15589 (Alexander Tokmakov).
  • Backported in #15715: 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).