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Merge branch 'changelog-23.10'

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Alexey Milovidov 2023-11-02 13:08:37 +01:00
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CHANGELOG.md
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* Allow to save unparsed records and errors in RabbitMQ, NATS and FileLog engines. Add virtual columns `_error` and `_raw_message`(for NATS and RabbitMQ), `_raw_record` (for FileLog) that are filled when ClickHouse fails to parse new record. The behaviour is controlled under storage settings `nats_handle_error_mode` for NATS, `rabbitmq_handle_error_mode` for RabbitMQ, `handle_error_mode` for FileLog similar to `kafka_handle_error_mode`. If it's set to `default`, en exception will be thrown when ClickHouse fails to parse a record, if it's set to `stream`, erorr and raw record will be saved into virtual columns. Closes [#36035](https://github.com/ClickHouse/ClickHouse/issues/36035). [#55477](https://github.com/ClickHouse/ClickHouse/pull/55477) ([Kruglov Pavel](https://github.com/Avogar)).
* Keeper client improvement: add `get_all_children_number command` that returns number of all children nodes under a specific path. [#55485](https://github.com/ClickHouse/ClickHouse/pull/55485) ([guoxiaolong](https://github.com/guoxiaolongzte)).
* Keeper client improvement: add `get_direct_children_number` command that returns number of direct children nodes under a path. [#55898](https://github.com/ClickHouse/ClickHouse/pull/55898) ([xuzifu666](https://github.com/xuzifu666)).
* Add setting `optimize_trivial_approximate_count_query` to use `count()` approximation for storage EmbeddedRocksDB. Enable trivial count for StorageJoin. [#55806](https://github.com/ClickHouse/ClickHouse/pull/55806) ([Duc Canh Le](https://github.com/canhld94)).
* Add statement `SHOW SETTING setting_name` which is a simpler version of existing statement `SHOW SETTINGS`. [#55979](https://github.com/ClickHouse/ClickHouse/pull/55979) ([Maksim Kita](https://github.com/kitaisreal)).
* Added fields `substreams` and `filenames` to the `system.parts_columns` table. [#55108](https://github.com/ClickHouse/ClickHouse/pull/55108) ([Anton Popov](https://github.com/CurtizJ)).
* Add support for `SHOW MERGES` query. [#55815](https://github.com/ClickHouse/ClickHouse/pull/55815) ([megao](https://github.com/jetgm)).
* Introduce a setting `create_table_empty_primary_key_by_default` for default `ORDER BY ()`. [#55899](https://github.com/ClickHouse/ClickHouse/pull/55899) ([Srikanth Chekuri](https://github.com/srikanthccv)).
* On a Keeper with lots of watches AsyncMetrics threads can consume 100% of CPU for noticable time in `DB::KeeperStorage::getSessionsWithWatchesCount()`. The fix is to avoid traversing heavy `watches` and `list_watches` sets. [#56054](https://github.com/ClickHouse/ClickHouse/pull/56054) ([Alexander Gololobov](https://github.com/davenger)).
#### Performance Improvement
* Add option `query_plan_preserve_num_streams_after_window_functions` to preserve the number of streams after evaluating window functions to allow parallel stream processing. [#50771](https://github.com/ClickHouse/ClickHouse/pull/50771) ([frinkr](https://github.com/frinkr)).
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* Reduced memory consumption during loading of hierarchical dictionaries. [#55838](https://github.com/ClickHouse/ClickHouse/pull/55838) ([Nikita Taranov](https://github.com/nickitat)).
* All dictionaries support setting `dictionary_use_async_executor`. [#55839](https://github.com/ClickHouse/ClickHouse/pull/55839) ([vdimir](https://github.com/vdimir)).
* Prevent excesive memory usage when deserializing AggregateFunctionTopKGenericData. [#55947](https://github.com/ClickHouse/ClickHouse/pull/55947) ([Raúl Marín](https://github.com/Algunenano)).
* On a Keeper with lots of watches AsyncMetrics threads can consume 100% of CPU for noticable time in `DB::KeeperStorage::getSessionsWithWatchesCount()`. The fix is to avoid traversing heavy `watches` and `list_watches` sets. [#56054](https://github.com/ClickHouse/ClickHouse/pull/56054) ([Alexander Gololobov](https://github.com/davenger)).
* Add setting `optimize_trivial_approximate_count_query` to use `count()` approximation for storage EmbeddedRocksDB. Enable trivial count for StorageJoin. [#55806](https://github.com/ClickHouse/ClickHouse/pull/55806) ([Duc Canh Le](https://github.com/canhld94)).
#### Improvement
* Functions `toDayOfWeek()` (MySQL alias: `DAYOFWEEK()`), `toYearWeek()` (`YEARWEEK()`) and `toWeek()` (`WEEK()`) now supports `String` arguments. This makes its behavior consistent with MySQL's behavior. [#55589](https://github.com/ClickHouse/ClickHouse/pull/55589) ([Robert Schulze](https://github.com/rschu1ze)).