### ClickHouse release v21.9.5.16-stable FIXME as compared to v21.9.4.35-stable
#### Improvement
* Backported in [#29897](https://github.com/ClickHouse/ClickHouse/issues/29897): Added partitioned table prefix 'p' for the query for fetching replica identity index. [#29828](https://github.com/ClickHouse/ClickHouse/pull/29828) ([Shoh Jahon](https://github.com/Shohjahon)).
* Backported in [#29943](https://github.com/ClickHouse/ClickHouse/issues/29943): Update zoneinfo files to 2021c. [#29925](https://github.com/ClickHouse/ClickHouse/pull/29925) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
#### Bug Fix
* Backported in [#29775](https://github.com/ClickHouse/ClickHouse/issues/29775): Allow using a materialized column as the sharding key in a distributed table even if `insert_allow_materialized_columns=0`:. [#28637](https://github.com/ClickHouse/ClickHouse/pull/28637) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#29126](https://github.com/ClickHouse/ClickHouse/issues/29126): Fix bug in `clickhouse-keeper-converter` which can lead to incorrect ZooKeeper log deserialization. [#29071](https://github.com/ClickHouse/ClickHouse/pull/29071) ([小路](https://github.com/nicelulu)).
* Backported in [#29972](https://github.com/ClickHouse/ClickHouse/issues/29972): Fix shutdown of `AccessControlManager`. Now there can't be reloading of the configuration after AccessControlManager has been destroyed. This PR fixes the flaky test [test_user_directories/test.py::test_relative_path](https://clickhouse-test-reports.s3.yandex.net/0/f0e3122507ed8bea3f177495531c7d56bcb32466/integration_tests_(thread).html). [#29951](https://github.com/ClickHouse/ClickHouse/pull/29951) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#30052](https://github.com/ClickHouse/ClickHouse/issues/30052): Fix releasing query ID and session ID at the end of query processing while handing gRPC call. This PR fixes flaky test [test_grpc_protocol/test.py::test_session](https://clickhouse-test-reports.s3.yandex.net/0/1ac03811a2df9717fa7c633d1af03def821d24b6/integration_tests_(memory).html). [#29954](https://github.com/ClickHouse/ClickHouse/pull/29954) ([Vitaly Baranov](https://github.com/vitlibar)).
* Backported in [#29055](https://github.com/ClickHouse/ClickHouse/issues/29055): Fix invalid constant type conversion when nullable or lowcardinality primary key is used. [#28636](https://github.com/ClickHouse/ClickHouse/pull/28636) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#29107](https://github.com/ClickHouse/ClickHouse/issues/29107): Fix waiting for mutation with `mutations_sync=2`. [#28889](https://github.com/ClickHouse/ClickHouse/pull/28889) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#29815](https://github.com/ClickHouse/ClickHouse/issues/29815): Do not allow to reuse previous credentials in case of inter-server secret (Before INSERT via Buffer/Kafka to Distributed table with interserver secret configured for that cluster, may re-use previously set user for that connection). [#29060](https://github.com/ClickHouse/ClickHouse/pull/29060) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#29399](https://github.com/ClickHouse/ClickHouse/issues/29399): Send normal `Database doesn't exist error` (`UNKNOWN_DATABASE`) to the client (via TCP) instead of `Attempt to read after eof` (`ATTEMPT_TO_READ_AFTER_EOF`). [#29229](https://github.com/ClickHouse/ClickHouse/pull/29229) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#29356](https://github.com/ClickHouse/ClickHouse/issues/29356): Fix possible `Table columns structure in ZooKeeper is different from local table structure` exception while recreating or creating new replicas of `ReplicatedMergeTree`, when one of table columns have default expressions with case-insensitive functions. [#29266](https://github.com/ClickHouse/ClickHouse/pull/29266) ([Anton Popov](https://github.com/CurtizJ)).
* Backported in [#29451](https://github.com/ClickHouse/ClickHouse/issues/29451): Fix failed assertion in ReadBufferFromHDFS. Update libhdfs3 library to be able to run in tests in debug. Closes [#29251](https://github.com/ClickHouse/ClickHouse/issues/29251). Closes [#27814](https://github.com/ClickHouse/ClickHouse/issues/27814). [#29276](https://github.com/ClickHouse/ClickHouse/pull/29276) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#29383](https://github.com/ClickHouse/ClickHouse/issues/29383): Remove window function `nth_value` as it is not memory-safe. This closes [#29347](https://github.com/ClickHouse/ClickHouse/issues/29347). [#29348](https://github.com/ClickHouse/ClickHouse/pull/29348) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#29438](https://github.com/ClickHouse/ClickHouse/issues/29438): Fix replicated access storage not shutting down cleanly when misconfigured. [#29388](https://github.com/ClickHouse/ClickHouse/pull/29388) ([Kevin Michel](https://github.com/kmichel-aiven)).
* Backported in [#29489](https://github.com/ClickHouse/ClickHouse/issues/29489): Fix Logical error `Cannot capture columns` in functions greatest/least. Closes [#29334](https://github.com/ClickHouse/ClickHouse/issues/29334). [#29454](https://github.com/ClickHouse/ClickHouse/pull/29454) ([Kruglov Pavel](https://github.com/Avogar)).
* Backported in [#29536](https://github.com/ClickHouse/ClickHouse/issues/29536): Fix possible `Block structure mismatch` for subqueries with pushed-down `HAVING` predicate. Fixes [#29010](https://github.com/ClickHouse/ClickHouse/issues/29010). [#29475](https://github.com/ClickHouse/ClickHouse/pull/29475) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#29592](https://github.com/ClickHouse/ClickHouse/issues/29592): In ODBC bridge add retries for error Invalid cursor state. It is a retriable error. Closes [#29473](https://github.com/ClickHouse/ClickHouse/issues/29473). [#29518](https://github.com/ClickHouse/ClickHouse/pull/29518) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#29572](https://github.com/ClickHouse/ClickHouse/issues/29572): Fix bug in check `pathStartsWith` becuase there was bug with the usage of `std::mismatch`: ` The behavior is undefined if the second range is shorter than the first range.`. [#29531](https://github.com/ClickHouse/ClickHouse/pull/29531) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Backported in [#29630](https://github.com/ClickHouse/ClickHouse/issues/29630): Fix rare segfault in `ALTER MODIFY` query when using incorrect table identifier in `DEFAULT` expression like `x.y.z...` Fixes [#29184](https://github.com/ClickHouse/ClickHouse/issues/29184). [#29573](https://github.com/ClickHouse/ClickHouse/pull/29573) ([alesapin](https://github.com/alesapin)).
* Backported in [#29658](https://github.com/ClickHouse/ClickHouse/issues/29658): Fix JIT expression compilation with aliases and short-circuit expression evaluation. Closes [#29403](https://github.com/ClickHouse/ClickHouse/issues/29403). [#29574](https://github.com/ClickHouse/ClickHouse/pull/29574) ([Maksim Kita](https://github.com/kitaisreal)).
* Backported in [#29751](https://github.com/ClickHouse/ClickHouse/issues/29751): Condition in filter predicate could be lost after push-down optimisation. [#29625](https://github.com/ClickHouse/ClickHouse/pull/29625) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Backported in [#29849](https://github.com/ClickHouse/ClickHouse/issues/29849): Fix concurrent access to `LowCardinality` during `GROUP BY` (leads to SIGSEGV). [#29782](https://github.com/ClickHouse/ClickHouse/pull/29782) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#29909](https://github.com/ClickHouse/ClickHouse/issues/29909): Fix bad cast in `ATTACH TABLE ... FROM 'path'` query when non-string literal is used instead of path. It may lead to reading of uninitialized memory. [#29790](https://github.com/ClickHouse/ClickHouse/pull/29790) ([Alexey Milovidov](https://github.com/alexey-milovidov)).
* Backported in [#29865](https://github.com/ClickHouse/ClickHouse/issues/29865): Avoid `Timeout exceeded: elapsed 18446744073.709553 seconds` error that might happen in extremely rare cases, presumably due to some bug in kernel. Fixes [#29154](https://github.com/ClickHouse/ClickHouse/issues/29154). [#29811](https://github.com/ClickHouse/ClickHouse/pull/29811) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#30024](https://github.com/ClickHouse/ClickHouse/issues/30024): MaterializedMySQL: Fix an issue where if the connection to MySQL was lost, only parts of a transaction could be processed. [#29837](https://github.com/ClickHouse/ClickHouse/pull/29837) ([Håvard Kvålen](https://github.com/havardk)).
* Backported in [#29878](https://github.com/ClickHouse/ClickHouse/issues/29878): Fix system tables recreation check (fails to detect changes in enum values). [#29857](https://github.com/ClickHouse/ClickHouse/pull/29857) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#30057](https://github.com/ClickHouse/ClickHouse/issues/30057): Fix potential resource leak of the concurrent query limit of merge tree tables introduced in https://github.com/ClickHouse/ClickHouse/pull/19544 . [#29879](https://github.com/ClickHouse/ClickHouse/pull/29879) ([Amos Bird](https://github.com/amosbird)).
* Backported in [#30204](https://github.com/ClickHouse/ClickHouse/issues/30204): Fix data-race between `LogSink::writeMarks()` and `LogSource` in `StorageLog`. [#29946](https://github.com/ClickHouse/ClickHouse/pull/29946) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#30209](https://github.com/ClickHouse/ClickHouse/issues/30209): Fix possible data-race between `FileChecker` and `StorageLog`/`StorageStripeLog`. [#29959](https://github.com/ClickHouse/ClickHouse/pull/29959) ([Azat Khuzhin](https://github.com/azat)).
* Backported in [#30070](https://github.com/ClickHouse/ClickHouse/issues/30070): Fix crash of sample by `tuple()`, closes [#30004](https://github.com/ClickHouse/ClickHouse/issues/30004). [#30016](https://github.com/ClickHouse/ClickHouse/pull/30016) ([flynn](https://github.com/ucasfl)).
* Backported in [#30128](https://github.com/ClickHouse/ClickHouse/issues/30128): Dropped `Memory` database might reappear after server restart, it's fixed ([#29795](https://github.com/ClickHouse/ClickHouse/issues/29795)). Also added `force_remove_data_recursively_on_drop` setting as a workaround for `Directory not empty` error when dropping `Ordinary` database (because it's not possible to remove data leftovers manually in cloud environment). [#30054](https://github.com/ClickHouse/ClickHouse/pull/30054) ([Alexander Tokmakov](https://github.com/tavplubix)).
* Backported in [#30262](https://github.com/ClickHouse/ClickHouse/issues/30262): FlatDictionary, HashedDictionary fix bytes_allocated calculation for nullable attributes. [#30238](https://github.com/ClickHouse/ClickHouse/pull/30238) ([Maksim Kita](https://github.com/kitaisreal)).
* Backported in [#30306](https://github.com/ClickHouse/ClickHouse/issues/30306): Fix crash with shortcircuit and lowcardinality in multiIf. [#30243](https://github.com/ClickHouse/ClickHouse/pull/30243) ([Raúl Marín](https://github.com/Algunenano)).
* Backported in [#30290](https://github.com/ClickHouse/ClickHouse/issues/30290): Fix ComplexKeyHashedDictionary, ComplexKeySparseHashedDictionary parsing `preallocate` option from layout config. [#30246](https://github.com/ClickHouse/ClickHouse/pull/30246) ([Maksim Kita](https://github.com/kitaisreal)).
#### NO CL CATEGORY
* Avoid deadlocks when reading and writting on JOIN Engine tables at the same time. [#30185](https://github.com/ClickHouse/ClickHouse/pull/30185) ([Raúl Marín](https://github.com/Algunenano)).
