ClickHouse/docs/changelogs/v21.3.8.76-lts.md

ClickHouse release v21.3.8.76-lts FIXME as compared to v21.3.7.62-stable

Improvement

• Backported in #23396: If tuple of NULLs, e.g. (NULL, NULL) is on the left hand side of IN operator with tuples of non-NULLs on the right hand side, e.g. SELECT (NULL, NULL) IN ((0, 0), (3, 1)) return 0 instead of throwing an exception about incompatible types. The expression may also appear due to optimization of something like SELECT (NULL, NULL) = (8, 0) OR (NULL, NULL) = (3, 2) OR (NULL, NULL) = (0, 0) OR (NULL, NULL) = (3, 1). This closes #22017. #22063 (Alexey Milovidov).
• Backported in #23272: Disable settings use_hedged_requests and async_socket_for_remote because there is an evidence that it may cause issues. #23261 (Alexey Milovidov).

Bug Fix

• Backported in #23232: Server might fail to start if data_type_default_nullable setting is enabled in default profile, it's fixed. Fixes #22573. #23185 (Alexander Tokmakov).
• Backported in #23406: QueryAliasVisitor to prefer alias for ASTWithAlias if subquery was optimized to constant. Fixes #22924. Fixes #10401. #23191 (Maksim Kita).
• Backported in #23381: Fixed Not found column error when selecting from MaterializeMySQL with condition on key column. Fixes #22432. #23200 (Alexander Tokmakov).
• Backported in #23284: Fixed simple key dictionary from DDL creation if primary key is not first attribute. Fixes #23236. #23262 (Maksim Kita).
• Backported in #23450: Fixed very rare (distributed) race condition between creation and removal of ReplicatedMergeTree tables. It might cause exceptions like node doesn't exist on attempt to create replicated table. Fixes #21419. #23294 (Alexander Tokmakov).
• Backported in #23500: Fix possible crash in case if unknown packet was received form remote query (with async_socket_for_remote enabled). Maybe fixes #21167. #23309 (Nikolai Kochetov).
• Backported in #23468: ORDER BY with COLLATE was not working correctly if the column is in primary key (or is a monotonic function of it) and the setting optimize_read_in_order is not turned off. This closes #22379. Workaround for older versions: turn the setting optimize_read_in_order off. #23375 (Alexey Milovidov).
• Backported in #23544: Remove support for argMin and argMax for single Tuple argument. The code was not memory-safe. The feature was added by mistake and it is confusing for people. These functions can be reintroduced under different names later. This fixes #22384 and reverts #17359. #23393 (Alexey Milovidov).
• Backported in #23479: Kafka storage may support arrow and arrowstream format messages. #23415 (Chao Ma).
• Backported in #23499: - Bug fix for deltaSum aggregate function in counter reset case ... #23437 (Russ Frank).
• Backported in #23493: Fix bug that does not allow cast from empty array literal, to array with dimensions greater than 1. Closes #14476. #23456 (Maksim Kita).
• Backported in #23536: When modify column's default value without datatype, and this column is used as ReplacingMergeTree's parameter like column b in the below example, then the server will core dump: CREATE TABLE alter_test (a Int32, b DateTime) ENGINE = ReplacingMergeTree(b) ORDER BY a; ALTER TABLE alter_test MODIFY COLUMN `b` DEFAULT now(); the sever throw error: 2021.04.22 09:48:00.685317 [ 2607 ] {} <Trace> BaseDaemon: Received signal 11 2021.04.22 09:48:00.686110 [ 2705 ] {} <Fatal> BaseDaemon: ######################################## 2021.04.22 09:48:00.686336 [ 2705 ] {} <Fatal> BaseDaemon: (version 21.6.1.1, build id: 6459E84DFCF8E778546C5AD2FFE91B3AD71E1B1B) (from thread 2619) (no query) Received signal Segmentation fault (11) 2021.04.22 09:48:00.686572 [ 2705 ] {} <Fatal> BaseDaemon: Address: NULL pointer. Access: read. Address not mapped to object. 2021.04.22 09:48:00.686686 [ 2705 ] {} <Fatal> BaseDaemon: Stack trace: 0x1c2585d7 0x1c254f66 0x1bb7e403 0x1bb58923 0x1bb56a85 0x1c6840ef 0x1c691148 0x2061a05c 0x2061a8e4 0x20775a03 0x207722bd 0x20771048 0x7f6e5c25be25 0x7f6e5bd81bad 2021.04.22 09:48:02.283045 [ 2705 ] {} <Fatal> BaseDaemon: 4. /mnt/disk4/hewenting/ClickHouse/src/src/Storages/MergeTree/MergeTreeData.cpp:1449: DB::(anonymous namespace)::checkVersionColumnTypesConversion(DB::IDataType const*, DB::IDataType const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) @ 0x1c2585d7 in /mnt/disk4/hewenting/ClickHouse/build-dbgsrc-clang-dev-nested/programs/clickhouse-server 2021.04.22 09:48:03.714451 [ 2705 ] {} <Fatal> BaseDaemon: 5. /mnt/disk4/hewenting/ClickHouse/src/src/Storages/MergeTree/MergeTreeData.cpp:1582: DB::MergeTreeData::checkAlterIsPossible(DB::AlterCommands const&, std::__1::shared_ptr<DB::Context>) const @ 0x1c254f66 in /mnt/disk4/hewenting/ClickHouse/build-dbgsrc-clang-dev-nested/programs/clickhouse-server 2021.04.22 09:48:04.692949 [ 2705 ] {} <Fatal> BaseDaemon: 6. /mnt/disk4/hewenting/ClickHouse/src/src/Interpreters/InterpreterAlterQuery.cpp:144: DB::InterpreterAlterQuery::execute() @ 0x1bb7e403 in /mnt/disk4/hewenting/ClickHouse/build-dbgsrc-clang-dev-nested/programs/clickhouse-server. #23483 (hexiaoting).
• Backported in #23533: Fix columns function when multiple joins in select query. Closes #22736. #23501 (Maksim Kita).