From d3b8b454f853c63da4b94ec97afdcb1528ffdc22 Mon Sep 17 00:00:00 2001 From: Ilya Yatsishin <2159081+qoega@users.noreply.github.com> Date: Tue, 27 Jun 2023 19:19:58 +0200 Subject: [PATCH 01/14] Fix segfault in MathUnary --- src/Functions/FunctionMathUnary.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/Functions/FunctionMathUnary.h b/src/Functions/FunctionMathUnary.h index 6e4bff7122d..9f400932356 100644 --- a/src/Functions/FunctionMathUnary.h +++ b/src/Functions/FunctionMathUnary.h @@ -154,6 +154,8 @@ private: using ColVecType = ColumnVectorOrDecimal; const auto col_vec = checkAndGetColumn(col.column.get()); + if (col_vec == nullptr) + return false; return (res = execute(col_vec)) != nullptr; }; From 575f3513977a21a8fea5ff30116636f2fc9ac2f1 Mon Sep 17 00:00:00 2001 From: Yatsishin Ilya <2159081+qoega@users.noreply.github.com> Date: Tue, 27 Jun 2023 18:34:12 +0000 Subject: [PATCH 02/14] add test --- tests/queries/0_stateless/02807_math_unary_crash.reference | 2 ++ tests/queries/0_stateless/02807_math_unary_crash.sql | 4 ++++ 2 files changed, 6 insertions(+) create mode 100644 tests/queries/0_stateless/02807_math_unary_crash.reference create mode 100644 tests/queries/0_stateless/02807_math_unary_crash.sql diff --git a/tests/queries/0_stateless/02807_math_unary_crash.reference b/tests/queries/0_stateless/02807_math_unary_crash.reference new file mode 100644 index 00000000000..6ed281c757a --- /dev/null +++ b/tests/queries/0_stateless/02807_math_unary_crash.reference @@ -0,0 +1,2 @@ +1 +1 diff --git a/tests/queries/0_stateless/02807_math_unary_crash.sql b/tests/queries/0_stateless/02807_math_unary_crash.sql new file mode 100644 index 00000000000..16c3ba1e0ae --- /dev/null +++ b/tests/queries/0_stateless/02807_math_unary_crash.sql @@ -0,0 +1,4 @@ +CREATE TABLE t10 (`c0` Int32) ENGINE = MergeTree ORDER BY tuple(); +INSERT INTO t10 (c0) FORMAT Values (-1); +SELECT 1 FROM t10 GROUP BY erf(-sign(t10.c0)); +SELECT 1 FROM t10 GROUP BY -sign(t10.c0); From 3e5abbbf48953288d5bcea4fab9f2431bd05873d Mon Sep 17 00:00:00 2001 From: Alexey Milovidov Date: Tue, 27 Jun 2023 22:47:19 +0300 Subject: [PATCH 03/14] Update 02807_math_unary_crash.sql --- tests/queries/0_stateless/02807_math_unary_crash.sql | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tests/queries/0_stateless/02807_math_unary_crash.sql b/tests/queries/0_stateless/02807_math_unary_crash.sql index 16c3ba1e0ae..fb693ac70f7 100644 --- a/tests/queries/0_stateless/02807_math_unary_crash.sql +++ b/tests/queries/0_stateless/02807_math_unary_crash.sql @@ -1,4 +1,6 @@ +DROP TABLE IF EXISTS t10; CREATE TABLE t10 (`c0` Int32) ENGINE = MergeTree ORDER BY tuple(); INSERT INTO t10 (c0) FORMAT Values (-1); SELECT 1 FROM t10 GROUP BY erf(-sign(t10.c0)); SELECT 1 FROM t10 GROUP BY -sign(t10.c0); +DROP TABLE t10; From b95e8704d3e0f255cb5a8830b87f4cb4ca3ebe4c Mon Sep 17 00:00:00 2001 From: Nikolay Degterinsky <43110995+evillique@users.noreply.github.com> Date: Wed, 28 Jun 2023 02:27:31 +0200 Subject: [PATCH 04/14] Fix test_host_regexp_multiple_ptr_records --- .../coredns_config/Corefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/integration/test_host_regexp_multiple_ptr_records/coredns_config/Corefile b/tests/integration/test_host_regexp_multiple_ptr_records/coredns_config/Corefile index 0dd198441dc..3edf37dafa5 100644 --- a/tests/integration/test_host_regexp_multiple_ptr_records/coredns_config/Corefile +++ b/tests/integration/test_host_regexp_multiple_ptr_records/coredns_config/Corefile @@ -1,6 +1,6 @@ . { hosts /example.com { - reload "200ms" + reload "20ms" fallthrough } forward . 127.0.0.11 From 42f3871833993ffb3fd135c47ee9ee81d2897116 Mon Sep 17 00:00:00 2001 From: Nikolay Degterinsky <43110995+evillique@users.noreply.github.com> Date: Wed, 28 Jun 2023 02:29:27 +0200 Subject: [PATCH 05/14] Fix test_host_regexp_multiple_ptr_records_concurrent --- .../coredns_config/Corefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/integration/test_host_regexp_multiple_ptr_records_concurrent/coredns_config/Corefile b/tests/integration/test_host_regexp_multiple_ptr_records_concurrent/coredns_config/Corefile index 0dd198441dc..3edf37dafa5 100644 --- a/tests/integration/test_host_regexp_multiple_ptr_records_concurrent/coredns_config/Corefile +++ b/tests/integration/test_host_regexp_multiple_ptr_records_concurrent/coredns_config/Corefile @@ -1,6 +1,6 @@ . { hosts /example.com { - reload "200ms" + reload "20ms" fallthrough } forward . 127.0.0.11 From c42bf37a141decb206e405470c2af6d85145bf3f Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Wed, 28 Jun 2023 09:59:32 -0400 Subject: [PATCH 06/14] list the disk types --- .../engines/table-engines/mergetree-family/mergetree.md | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/docs/en/engines/table-engines/mergetree-family/mergetree.md b/docs/en/engines/table-engines/mergetree-family/mergetree.md index 42454af6feb..c67ac8fa4ef 100644 --- a/docs/en/engines/table-engines/mergetree-family/mergetree.md +++ b/docs/en/engines/table-engines/mergetree-family/mergetree.md @@ -756,6 +756,14 @@ If you perform the `SELECT` query between merges, you may get expired data. To a - [ttl_only_drop_parts](/docs/en/operations/settings/settings.md/#ttl_only_drop_parts) setting +## Disk types + +In addition to local block devices, ClickHouse supports other device types through table engines. These are the types: +- [S3](#table_engine-mergetree-s3) +- GCS (also supported using the [S3 table engine](#table_engine-mergetree-s3)) +- [Azure Blob Storage](#table_engine-mergetree-azure-blob-storage) +- [HDFS](/docs/en/sql-reference/table-functions/hdfs.md) + ## Using Multiple Block Devices for Data Storage {#table_engine-mergetree-multiple-volumes} ### Introduction {#introduction} From bfcadabb927e5ea547c29df488d3fe6ea396a178 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Wed, 28 Jun 2023 10:30:49 -0400 Subject: [PATCH 07/14] add web disk type --- docs/en/engines/table-engines/mergetree-family/mergetree.md | 3 +++ 1 file changed, 3 insertions(+) diff --git a/docs/en/engines/table-engines/mergetree-family/mergetree.md b/docs/en/engines/table-engines/mergetree-family/mergetree.md index c67ac8fa4ef..1f084fe075b 100644 --- a/docs/en/engines/table-engines/mergetree-family/mergetree.md +++ b/docs/en/engines/table-engines/mergetree-family/mergetree.md @@ -763,6 +763,7 @@ In addition to local block devices, ClickHouse supports other device types throu - GCS (also supported using the [S3 table engine](#table_engine-mergetree-s3)) - [Azure Blob Storage](#table_engine-mergetree-azure-blob-storage) - [HDFS](/docs/en/sql-reference/table-functions/hdfs.md) +- [Web (read-only)](#web-storage) ## Using Multiple Block Devices for Data Storage {#table_engine-mergetree-multiple-volumes} @@ -944,6 +945,8 @@ configuration files; all the settings are in the CREATE/ATTACH query. The example uses `type=web`, but any disk type can be configured as dynamic, even Local disk. Local disks require a path argument to be inside the server config parameter `custom_local_disks_base_directory`, which has no default, so set that also when using local disk. ::: +#### Example dynamic web storage {#web-storage} + ```sql ATTACH TABLE uk_price_paid UUID 'cf712b4f-2ca8-435c-ac23-c4393efe52f7' ( From b392127304d8c14ce34bd86d0b8ca561e1559919 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Wed, 28 Jun 2023 11:00:07 -0400 Subject: [PATCH 08/14] add example web config --- .../mergetree-family/mergetree.md | 53 ++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/docs/en/engines/table-engines/mergetree-family/mergetree.md b/docs/en/engines/table-engines/mergetree-family/mergetree.md index 1f084fe075b..b87c4d216cf 100644 --- a/docs/en/engines/table-engines/mergetree-family/mergetree.md +++ b/docs/en/engines/table-engines/mergetree-family/mergetree.md @@ -945,7 +945,7 @@ configuration files; all the settings are in the CREATE/ATTACH query. The example uses `type=web`, but any disk type can be configured as dynamic, even Local disk. Local disks require a path argument to be inside the server config parameter `custom_local_disks_base_directory`, which has no default, so set that also when using local disk. ::: -#### Example dynamic web storage {#web-storage} +#### Example dynamic web storage ```sql ATTACH TABLE uk_price_paid UUID 'cf712b4f-2ca8-435c-ac23-c4393efe52f7' @@ -1249,6 +1249,57 @@ Examples of working configurations can be found in integration tests directory ( Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use. ::: +## Web storage (read-only) {#web-storage} + +Web storage can be used for read-only purposes. An example use is for hosting sample +data, or for migrating data. + +:::tip +Storage can also be configured temporarily within a query, if a web dataset is not expected +to be used routinely, see [dynamic storage](#dynamic-storage) and skip editing the +configuration file. +::: + +In this sample configuration: +- the disk is of type `web` +- the data is hosted at `http://nginx:80/test1/` +- a cache on local storage is used + +```xml + + + + + web + http://nginx:80/test1/ + + + cache + web + cached_web_cache/ + 100000000 + + + + + +
+ web +
+ + + + +
+ cached_web +
+ + + + + +``` + ## Virtual Columns {#virtual-columns} - `_part` — Name of a part. From dd3a744cef6e736bc68782fd79853a1535bdebb8 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Wed, 28 Jun 2023 11:17:16 -0400 Subject: [PATCH 09/14] add HDFS example --- .../mergetree-family/mergetree.md | 38 ++++++++++++++++++- 1 file changed, 37 insertions(+), 1 deletion(-) diff --git a/docs/en/engines/table-engines/mergetree-family/mergetree.md b/docs/en/engines/table-engines/mergetree-family/mergetree.md index b87c4d216cf..1b7f3263ab9 100644 --- a/docs/en/engines/table-engines/mergetree-family/mergetree.md +++ b/docs/en/engines/table-engines/mergetree-family/mergetree.md @@ -762,7 +762,7 @@ In addition to local block devices, ClickHouse supports other device types throu - [S3](#table_engine-mergetree-s3) - GCS (also supported using the [S3 table engine](#table_engine-mergetree-s3)) - [Azure Blob Storage](#table_engine-mergetree-azure-blob-storage) -- [HDFS](/docs/en/sql-reference/table-functions/hdfs.md) +- [HDFS](#hdfs-storage) - [Web (read-only)](#web-storage) ## Using Multiple Block Devices for Data Storage {#table_engine-mergetree-multiple-volumes} @@ -1249,6 +1249,42 @@ Examples of working configurations can be found in integration tests directory ( Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use. ::: +## HDFS storage {#hdfs-storage} + +In this sample configuration: +- the disk is of type `hdfs` +- the data is hosted at `hdfs://hdfs1:9000/clickhouse/` + +```xml + + + + + hdfs + hdfs://hdfs1:9000/clickhouse/ + true + + + local + / + + + + + +
+ hdfs +
+ + hdd + + + + + + +``` + ## Web storage (read-only) {#web-storage} Web storage can be used for read-only purposes. An example use is for hosting sample From 6ec85f9faa548e50ec1a6b4a2d7868c9f7e0079a Mon Sep 17 00:00:00 2001 From: Denny Crane Date: Thu, 29 Jun 2023 11:06:28 -0300 Subject: [PATCH 10/14] Update settings.md --- docs/en/operations/settings/settings.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/en/operations/settings/settings.md b/docs/en/operations/settings/settings.md index cff65e049f3..cff13302cdc 100644 --- a/docs/en/operations/settings/settings.md +++ b/docs/en/operations/settings/settings.md @@ -1322,7 +1322,7 @@ Connection pool size for PostgreSQL table engine and database engine. Default value: 16 -## postgresql_connection_pool_size {#postgresql-connection-pool-size} +## postgresql_connection_pool_wait_timeout {#postgresql-connection-pool-wait-timeout} Connection pool push/pop timeout on empty pool for PostgreSQL table engine and database engine. By default it will block on empty pool. From 4ee094cab1a4aed4091679e54e6ac146b2423693 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Thu, 29 Jun 2023 12:13:26 -0400 Subject: [PATCH 11/14] review comments --- .../table-engines/mergetree-family/mergetree.md | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/docs/en/engines/table-engines/mergetree-family/mergetree.md b/docs/en/engines/table-engines/mergetree-family/mergetree.md index 1b7f3263ab9..a1c2fbdbe50 100644 --- a/docs/en/engines/table-engines/mergetree-family/mergetree.md +++ b/docs/en/engines/table-engines/mergetree-family/mergetree.md @@ -758,12 +758,14 @@ If you perform the `SELECT` query between merges, you may get expired data. To a ## Disk types -In addition to local block devices, ClickHouse supports other device types through table engines. These are the types: -- [S3](#table_engine-mergetree-s3) -- GCS (also supported using the [S3 table engine](#table_engine-mergetree-s3)) -- [Azure Blob Storage](#table_engine-mergetree-azure-blob-storage) -- [HDFS](#hdfs-storage) -- [Web (read-only)](#web-storage) +In addition to local block devices, ClickHouse supports these storage types: +- [`s3` for S3 and MinIO](#table_engine-mergetree-s3) +- [`gcs` for GCS](/docs/en/integrations/data-ingestion/gcs/index.md/#creating-a-disk) +- [`blob_storage_disk` for Azure Blob Storage](#table_engine-mergetree-azure-blob-storage) +- [`hdfs` for HDFS](#hdfs-storage) +- [`web` for read-only from web](#web-storage) +- [`cache` for local caching](/docs/en/operations/storing-data.md/#using-local-cache) +- [`s3_plain` for backups to S3](/docs/en/operations/backup#backuprestore-using-an-s3-disk) ## Using Multiple Block Devices for Data Storage {#table_engine-mergetree-multiple-volumes} From 7d416cbc60c89ce34e03e7e9de5045e0120af119 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Thu, 29 Jun 2023 13:39:39 -0400 Subject: [PATCH 12/14] add exception docs for hasAll --- .../sql-reference/functions/array-functions.md | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/docs/en/sql-reference/functions/array-functions.md b/docs/en/sql-reference/functions/array-functions.md index bdd1445c990..7f2b8f3c605 100644 --- a/docs/en/sql-reference/functions/array-functions.md +++ b/docs/en/sql-reference/functions/array-functions.md @@ -230,13 +230,15 @@ hasAll(set, subset) **Arguments** - `set` – Array of any type with a set of elements. -- `subset` – Array of any type with elements that should be tested to be a subset of `set`. +- `subset` – Array of any type that shares a common supertype with `set` containing elements that should be tested to be a subset of `set`. **Return values** - `1`, if `set` contains all of the elements from `subset`. - `0`, otherwise. +Raises an exception `NO_COMMON_TYPE` if the set and subset elements do not share a common supertype. + **Peculiar properties** - An empty array is a subset of any array. @@ -253,7 +255,7 @@ hasAll(set, subset) `SELECT hasAll(['a', 'b'], ['a'])` returns 1. -`SELECT hasAll([1], ['a'])` returns 0. +`SELECT hasAll([1], ['a'])` raises a `NO_COMMON_TYPE` exception. `SELECT hasAll([[1, 2], [3, 4]], [[1, 2], [3, 5]])` returns 0. @@ -268,13 +270,15 @@ hasAny(array1, array2) **Arguments** - `array1` – Array of any type with a set of elements. -- `array2` – Array of any type with a set of elements. +- `array2` – Array of any type that shares a common supertype with `array1`. **Return values** - `1`, if `array1` and `array2` have one similar element at least. - `0`, otherwise. +Raises an exception `NO_COMMON_TYPE` if the array1 and array2 elements do not share a common supertype. + **Peculiar properties** - `Null` processed as a value. @@ -288,7 +292,7 @@ hasAny(array1, array2) `SELECT hasAny([-128, 1., 512], [1])` returns `1`. -`SELECT hasAny([[1, 2], [3, 4]], ['a', 'c'])` returns `0`. +`SELECT hasAny([[1, 2], [3, 4]], ['a', 'c'])` raises a `NO_COMMON_TYPE` exception. `SELECT hasAll([[1, 2], [3, 4]], [[1, 2], [1, 2]])` returns `1`. @@ -318,6 +322,8 @@ For Example: - `1`, if `array1` contains `array2`. - `0`, otherwise. +Raises an exception `NO_COMMON_TYPE` if the array1 and array2 elements do not share a common supertype. + **Peculiar properties** - The function will return `1` if `array2` is empty. @@ -339,6 +345,9 @@ For Example: `SELECT hasSubstr(['a', 'b' , 'c'], ['a', 'c'])` returns 0. `SELECT hasSubstr([[1, 2], [3, 4], [5, 6]], [[1, 2], [3, 4]])` returns 1. +i +`SELECT hasSubstr([1, 2, NULL, 3, 4], ['a'])` raises a `NO_COMMON_TYPE` exception. + ## indexOf(arr, x) From a8172ca5d2557673d370de4f4551f756ff0722a7 Mon Sep 17 00:00:00 2001 From: DanRoscigno Date: Thu, 29 Jun 2023 14:47:23 -0400 Subject: [PATCH 13/14] update spelling list --- utils/check-style/aspell-ignore/en/aspell-dict.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/utils/check-style/aspell-ignore/en/aspell-dict.txt b/utils/check-style/aspell-ignore/en/aspell-dict.txt index 526e674a154..f25d082e5a6 100644 --- a/utils/check-style/aspell-ignore/en/aspell-dict.txt +++ b/utils/check-style/aspell-ignore/en/aspell-dict.txt @@ -2264,6 +2264,7 @@ summap summingmergetree sumwithoverflow superaggregates +supertype supremum symlink symlinks From 90129b92c1dd47c0aa86cd5ed7c8107758a74b51 Mon Sep 17 00:00:00 2001 From: Alexey Milovidov Date: Thu, 29 Jun 2023 21:19:41 +0200 Subject: [PATCH 14/14] Update 23.6 changelog --- CHANGELOG.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/CHANGELOG.md b/CHANGELOG.md index a2e7b021081..c1e0dba4465 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -21,7 +21,7 @@ * Added `Overlay` database engine to combine multiple databases into one. Added `Filesystem` database engine to represent a directory in the filesystem as a set of implicitly available tables with auto-detected formats and structures. A new `S3` database engine allows to read-only interact with s3 storage by representing a prefix as a set of tables. A new `HDFS` database engine allows to interact with HDFS storage in the same way. [#48821](https://github.com/ClickHouse/ClickHouse/pull/48821) ([alekseygolub](https://github.com/alekseygolub)). * The function `transform` as well as `CASE` with value matching started to support all data types. This closes [#29730](https://github.com/ClickHouse/ClickHouse/issues/29730). This closes [#32387](https://github.com/ClickHouse/ClickHouse/issues/32387). This closes [#50827](https://github.com/ClickHouse/ClickHouse/issues/50827). This closes [#31336](https://github.com/ClickHouse/ClickHouse/issues/31336). This closes [#40493](https://github.com/ClickHouse/ClickHouse/issues/40493). [#51351](https://github.com/ClickHouse/ClickHouse/pull/51351) ([Alexey Milovidov](https://github.com/alexey-milovidov)). * Added option `--rename_files_after_processing `. This closes [#34207](https://github.com/ClickHouse/ClickHouse/issues/34207). [#49626](https://github.com/ClickHouse/ClickHouse/pull/49626) ([alekseygolub](https://github.com/alekseygolub)). -* Add support for `APPEND` modifier in `INTO OUTFILE` clause. Suggest using `APPEND` or `TRUNCATE` for `INTO OUTFILE` when file exists. [#50950](https://github.com/ClickHouse/ClickHouse/pull/50950) ([alekar](https://github.com/alekar)). +* Add support for `TRUNCATE` modifier in `INTO OUTFILE` clause. Suggest using `APPEND` or `TRUNCATE` for `INTO OUTFILE` when file exists. [#50950](https://github.com/ClickHouse/ClickHouse/pull/50950) ([alekar](https://github.com/alekar)). * Add table engine `Redis` and table function `redis`. It allows querying external Redis servers. [#50150](https://github.com/ClickHouse/ClickHouse/pull/50150) ([JackyWoo](https://github.com/JackyWoo)). * Allow to skip empty files in file/s3/url/hdfs table functions using settings `s3_skip_empty_files`, `hdfs_skip_empty_files`, `engine_file_skip_empty_files`, `engine_url_skip_empty_files`. [#50364](https://github.com/ClickHouse/ClickHouse/pull/50364) ([Kruglov Pavel](https://github.com/Avogar)). * Add a new setting named `use_mysql_types_in_show_columns` to alter the `SHOW COLUMNS` SQL statement to display MySQL equivalent types when a client is connected via the MySQL compatibility port. [#49577](https://github.com/ClickHouse/ClickHouse/pull/49577) ([Thomas Panetti](https://github.com/tpanetti)). @@ -40,12 +40,12 @@ * Make multiple list requests to ZooKeeper in parallel to speed up reading from system.zookeeper table. [#51042](https://github.com/ClickHouse/ClickHouse/pull/51042) ([Alexander Gololobov](https://github.com/davenger)). * Speedup initialization of DateTime lookup tables for time zones. This should reduce startup/connect time of clickhouse-client especially in debug build as it is rather heavy. [#51347](https://github.com/ClickHouse/ClickHouse/pull/51347) ([Alexander Gololobov](https://github.com/davenger)). * Fix data lakes slowness because of synchronous head requests. (Related to Iceberg/Deltalake/Hudi being slow with a lot of files). [#50976](https://github.com/ClickHouse/ClickHouse/pull/50976) ([Kseniia Sumarokova](https://github.com/kssenii)). -* Do not replicate `ALTER PARTITION` queries and mutations through `Replicated` database if it has only one shard and the underlying table is `ReplicatedMergeTree`. [#51049](https://github.com/ClickHouse/ClickHouse/pull/51049) ([Alexander Tokmakov](https://github.com/tavplubix)). * Do not read all the columns from right GLOBAL JOIN table. [#50721](https://github.com/ClickHouse/ClickHouse/pull/50721) ([Nikolai Kochetov](https://github.com/KochetovNicolai)). #### Experimental Feature * Support parallel replicas with the analyzer. [#50441](https://github.com/ClickHouse/ClickHouse/pull/50441) ([Raúl Marín](https://github.com/Algunenano)). * Add random sleep before large merges/mutations execution to split load more evenly between replicas in case of zero-copy replication. [#51282](https://github.com/ClickHouse/ClickHouse/pull/51282) ([alesapin](https://github.com/alesapin)). +* Do not replicate `ALTER PARTITION` queries and mutations through `Replicated` database if it has only one shard and the underlying table is `ReplicatedMergeTree`. [#51049](https://github.com/ClickHouse/ClickHouse/pull/51049) ([Alexander Tokmakov](https://github.com/tavplubix)). #### Improvement * Relax the thresholds for "too many parts" to be more modern. Return the backpressure during long-running insert queries. [#50856](https://github.com/ClickHouse/ClickHouse/pull/50856) ([Alexey Milovidov](https://github.com/alexey-milovidov)).