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ClickHouse/docs/changelogs/v20.7.4.11-stable.md

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### ClickHouse release v20.7.4.11-stable FIXME as compared to v20.7.3.7-stable
#### Improvement
* Backported in [#15566](https://github.com/ClickHouse/ClickHouse/issues/15566): Now it's possible to change the type of version column for `VersionedCollapsingMergeTree` with `ALTER` query. [#15442](https://github.com/ClickHouse/ClickHouse/pull/15442) ([alesapin](https://github.com/alesapin)).
#### Bug Fix
* Backported in [#15019](https://github.com/ClickHouse/ClickHouse/issues/15019): Fixed the incorrect sorting order of `Nullable` column. This fixes [#14344](https://github.com/ClickHouse/ClickHouse/issues/14344). [#14495](https://github.com/ClickHouse/ClickHouse/pull/14495) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Backported in [#14824](https://github.com/ClickHouse/ClickHouse/issues/14824): 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](https://github.com/ClickHouse/ClickHouse/issues/14513). [#14783](https://github.com/ClickHouse/ClickHouse/pull/14783) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#15149](https://github.com/ClickHouse/ClickHouse/issues/15149): 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](https://github.com/ClickHouse/ClickHouse/issues/14814). [#14843](https://github.com/ClickHouse/ClickHouse/pull/14843) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Backported in [#15252](https://github.com/ClickHouse/ClickHouse/issues/15252): Fixed segfault in CacheDictionary [#14837](https://github.com/ClickHouse/ClickHouse/issues/14837). [#14879](https://github.com/ClickHouse/ClickHouse/pull/14879) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Backported in [#14988](https://github.com/ClickHouse/ClickHouse/issues/14988): Publish CPU frequencies per logical core in `system.asynchronous_metrics`. This fixes [#14923](https://github.com/ClickHouse/ClickHouse/issues/14923). [#14924](https://github.com/ClickHouse/ClickHouse/pull/14924) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Backported in [#14970](https://github.com/ClickHouse/ClickHouse/issues/14970): Fix to make predicate push down work when subquery contains finalizeAggregation function. Fixes [#14847](https://github.com/ClickHouse/ClickHouse/issues/14847). [#14937](https://github.com/ClickHouse/ClickHouse/pull/14937) ([filimonov](https://github.com/filimonov)).
* Backported in [#15054](https://github.com/ClickHouse/ClickHouse/issues/15054): 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](https://github.com/ClickHouse/ClickHouse/pull/14975) ([alesapin](https://github.com/alesapin)).
* Backported in [#15078](https://github.com/ClickHouse/ClickHouse/issues/15078): Fix crash in RIGHT or FULL JOIN with join_algorith='auto' when memory limit exceeded and we should change HashJoin with MergeJoin. [#15002](https://github.com/ClickHouse/ClickHouse/pull/15002) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#15103](https://github.com/ClickHouse/ClickHouse/issues/15103): 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](https://github.com/ClickHouse/ClickHouse/pull/15024) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#15058](https://github.com/ClickHouse/ClickHouse/issues/15058): If function `bar` was called with specifically crafted arguments, buffer overflow was possible. This closes [#13926](https://github.com/ClickHouse/ClickHouse/issues/13926). [#15028](https://github.com/ClickHouse/ClickHouse/pull/15028) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#15051](https://github.com/ClickHouse/ClickHouse/issues/15051): 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](https://github.com/ClickHouse/ClickHouse/issues/14908). [#15033](https://github.com/ClickHouse/ClickHouse/pull/15033) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#15140](https://github.com/ClickHouse/ClickHouse/issues/15140): 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](https://github.com/ClickHouse/ClickHouse/pull/15088) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#15221](https://github.com/ClickHouse/ClickHouse/issues/15221): Fix bug in table engine `Buffer` which doesn't allow to insert data of new structure into `Buffer` after `ALTER` query. Fixes [#15117](https://github.com/ClickHouse/ClickHouse/issues/15117). [#15192](https://github.com/ClickHouse/ClickHouse/pull/15192) ([alesapin](https://github.com/alesapin)).
* Backported in [#15406](https://github.com/ClickHouse/ClickHouse/issues/15406): Fix instance crash when using joinGet with LowCardinality types. This fixes [#15214](https://github.com/ClickHouse/ClickHouse/issues/15214). [#15220](https://github.com/ClickHouse/ClickHouse/pull/15220) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#15488](https://github.com/ClickHouse/ClickHouse/issues/15488): Fix 'Unknown identifier' in GROUP BY when query has JOIN over Merge table. [#15242](https://github.com/ClickHouse/ClickHouse/pull/15242) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#15280](https://github.com/ClickHouse/ClickHouse/issues/15280): Fix MSan report in QueryLog. Uninitialized memory can be used for the field `memory_usage`. [#15258](https://github.com/ClickHouse/ClickHouse/pull/15258) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#15415](https://github.com/ClickHouse/ClickHouse/issues/15415): 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](https://github.com/ClickHouse/ClickHouse/pull/15299) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#15337](https://github.com/ClickHouse/ClickHouse/issues/15337): Fix rare race condition on server startup when system.logs are enabled. [#15300](https://github.com/ClickHouse/ClickHouse/pull/15300) ([alesapin](https://github.com/alesapin)).
* Backported in [#15333](https://github.com/ClickHouse/ClickHouse/issues/15333): Fix race condition during MergeTree table rename and background cleanup. [#15304](https://github.com/ClickHouse/ClickHouse/pull/15304) ([alesapin](https://github.com/alesapin)).
* Backported in [#15444](https://github.com/ClickHouse/ClickHouse/issues/15444): Report proper error when the second argument of `boundingRatio` aggregate function has a wrong type. [#15407](https://github.com/ClickHouse/ClickHouse/pull/15407) ([detailyang](https://github.com/detailyang)).
* Backported in [#15506](https://github.com/ClickHouse/ClickHouse/issues/15506): Fix bug with event subscription in DDLWorker which rarely may lead to query hangs in `ON CLUSTER`. Introduced in [#13450](https://github.com/ClickHouse/ClickHouse/issues/13450). [#15477](https://github.com/ClickHouse/ClickHouse/pull/15477) ([alesapin](https://github.com/alesapin)).
* Backported in [#15617](https://github.com/ClickHouse/ClickHouse/issues/15617): Fix `Missing columns` errors when selecting columns which absent in data, but depend on other columns which also absent in data. Fixes [#15530](https://github.com/ClickHouse/ClickHouse/issues/15530). [#15532](https://github.com/ClickHouse/ClickHouse/pull/15532) ([alesapin](https://github.com/alesapin)).
* Backported in [#15559](https://github.com/ClickHouse/ClickHouse/issues/15559): Fix bug when `ILIKE` operator stops being case insensitive if `LIKE` with the same pattern was executed. [#15536](https://github.com/ClickHouse/ClickHouse/pull/15536) ([alesapin](https://github.com/alesapin)).
* Backported in [#15727](https://github.com/ClickHouse/ClickHouse/issues/15727): 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](https://github.com/ClickHouse/ClickHouse/pull/15537) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#15653](https://github.com/ClickHouse/ClickHouse/issues/15653): Fix 'Database <db> doesn't exist.' in queries with IN and Distributed table when there's no database on initiator. [#15538](https://github.com/ClickHouse/ClickHouse/pull/15538) ([Artem Zuikov](https://github.com/4ertus2)).
* Backported in [#15632](https://github.com/ClickHouse/ClickHouse/issues/15632): Significantly reduce memory usage in AggregatingInOrderTransform/optimize_aggregation_in_order. [#15543](https://github.com/ClickHouse/ClickHouse/pull/15543) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#15584](https://github.com/ClickHouse/ClickHouse/issues/15584): Prevent the possibility of error message `Could not calculate available disk space (statvfs), errno: 4, strerror: Interrupted system call`. This fixes [#15541](https://github.com/ClickHouse/ClickHouse/issues/15541). [#15557](https://github.com/ClickHouse/ClickHouse/pull/15557) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#15663](https://github.com/ClickHouse/ClickHouse/issues/15663): Fixed `Element ... is not a constant expression` error when using `JSON*` function result in `VALUES`, `LIMIT` or right side of `IN` operator. [#15589](https://github.com/ClickHouse/ClickHouse/pull/15589) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#15716](https://github.com/ClickHouse/ClickHouse/issues/15716): Fix the order of destruction for resources in `ReadFromStorage` step of query plan. It might cause crashes in rare cases. Possibly connected with [#15610](https://github.com/ClickHouse/ClickHouse/issues/15610). [#15645](https://github.com/ClickHouse/ClickHouse/pull/15645) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
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