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050f2d4e-442a-43ef-b400-84ffa4ea6fe0
Make pathStartsWith only match paths under the prefix. #87181 ( Raúl Marín ). Fixed logical errors in _row_number virtual column and iceberg positioned deletes. #87220 ( Michael Kolupaev ). Fix "Too large size passed to allocator" LOGICAL_ERROR in JOIN due to mixed const and non-const blocks. #87231 ( A...
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73e854c9-775e-45b4-8f8d-caab9c68492e
Fixed two-level aggregation when using Merge over Distributed . #87687 ( c-end ). Fix the generation of the output block in the HashJoin algorithm when the right row list is not used. Fixes #87401 . #87699 ( Dmitry Novik ). Parallel replicas read mode could be chosen incorrectly if there are no data to read...
{"source_file": "index.md"}
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bfb59110-1eaf-47e9-8821-ee7f8a62eec0
Now ON CLUSTER queries will take less time in case of inactive replicas in cluster. #88153 ( alesapin ). Now DDL worker cleanup outdated hosts from replicas set. It will reduce amount of stored metadata in ZooKeeper. #88154 ( alesapin ). Fix running ClickHouse w/o cgroups (accidentally cgroups became a requir...
{"source_file": "index.md"}
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c70971ce-ce97-43db-a477-a158e6bae803
Fix "column not found" error when using query_plan_use_logical_join_step=0 with multiple FULL JOIN USING clauses. Closes #88103 . #88473 ( Vladimir Cherkasov ). Big clusters with node numbers > 10 have a high probability of failing the restore with error [941] 67c45db4-4df4-4879-87c5-25b8d1e0d414 <Trace>: Resto...
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306f5a4c-c945-40ed-b0ed-6a93086268b3
Backported in #89060 : Fix top_k to respect the threshold parameter when called with a single argument. Closes #88757 . #88867 ( Manuel ). Backported in #88944 : Fix bug in the function reverseUTF8 . In previous versions, it mistakenly reversed the bytes of UTF-8 code points of length 4. This closes #88913 ....
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5cf67bcc-9394-4f65-a0fd-89e603ff018a
Increase replicated deduplication window up to 10000. This is fully compatible, but we can imagine scenarios when this change could lead to high resource consumption in the presence of a large number of tables. #86820 ( Sema Checherinda ). New Feature Users can now use NATS JetStream to consume messages by sp...
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aec223cf-87ff-4b31-a5e3-ab6a5f195dff
Allows users to create temporary views with a similar syntax to temporary tables ( CREATE TEMPORARY VIEW ). #86432 ( Aly Kafoury ). Add warnings for CPU and memory usage to the system.warnings table. #86838 ( Bharat Nallan ). Support the oneof indicator in Protobuf inputs. A special column may be used to ...
{"source_file": "index.md"}
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451e999d-9178-4522-8c5f-602bf9849a94
Added JOIN order optimization that can automatically reorder JOINs for better performance (controlled by query_plan_optimize_join_order_limit setting). Note that the join order optimization currently has limited statistics support and primarily relies on row count estimates from storage engines - more sophisticated s...
{"source_file": "index.md"}
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81246981-6808-4991-b387-137220902a73
Improved performance of applying patch parts in the join mode. #87094 ( Anton Popov ). Added setting query_condition_cache_selectivity_threshold (default value: 1.0) which excludes scan results of predicates with low selectivity from insertion into the query condition cache. This allows to reduce the memory consu...
{"source_file": "index.md"}
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68dc5456-11c9-47ed-9448-6b530f17e3ba
Support filtering by complete URL string ( full_url directive) in http_handlers (including schema and host:port). #86155 ( Azat Khuzhin ). Add a new setting, allow_experimental_delta_lake_writes . #86180 ( Kseniia Sumarokova ). Fix detection of systemd in init.d script (fixes "Install packages" check). #86...
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63c9059c-aabf-4c97-85f2-7126daba5db4
Add ability to tune pending signals in attempt to overcome CANNOT_CREATE_TIMER (for query profilers, query_profiler_real_time_period_ns / query_profiler_cpu_time_period_ns ). And also collect SigQ from the /proc/self/status for introspection (if ProcessSignalQueueSize is near to ProcessSignalQueueLimit , then y...
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bfd37f88-779c-41a1-bbef-55946f44da7b
Check access rights during typo correction hints generation for the database name. #85371 ( Dmitry Novik ). LowCardinality for hive columns 2. Fill hive columns before virtual columns (required for https://github.com/ClickHouse/ClickHouse/pull/81040) 3. LOGICAL_ERROR on empty format for hive #85528 4. Fix che...
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133cc200-0a67-4a23-97ab-0204f805c88d
Use NonZeroUInt64 for logs_to_keep in DatabaseReplicatedSettings. #86142 ( Tuan Pham Anh ). Exception was thrown by a FINAL query with skip index if the table (e.g ReplacingMergeTree ) was created with setting index_granularity_bytes = 0 . That exception has been fixed now. #86147 ( Shankar Iyer ). Remov...
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a5076867-a6af-434f-8b13-a8d3d8174ff7
Functions searchAny and searchAll when called with empty needles now return true (aka. "matches everything"). Previously, they returned false . (issue #86300 ). #86500 ( Elmi Ahmadov ). Fix function timeSeriesResampleToGridWithStaleness() when the first bucket has no value. #86507 ( Vitaly Baranov ). ...
{"source_file": "index.md"}
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908901c0-63a2-4a63-908a-f888ba194a0f
Fix seeking at the end of the decompressed block. #86906 ( Pavel Kruglov ). Process exception which is thrown during asyncronous execution of Iceberg Iterator. #86932 ( Daniil Ivanik ). Fix saving of big preprocessed XML configs. #86934 ( c-end ). Fix date field populating in system.iceberg_metadata_log tab...
{"source_file": "index.md"}
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1f8d3316-9a86-490c-ac47-53fd7cdce74b
Fix unpacking Rust crate names in list-licenses.sh . #87305 ( Konstantin Bogdanov ). ClickHouse release 25.8 LTS, 2025-08-28 {#258} Backward Incompatible Change Infer Array(Dynamic) instead of unnamed Tuple for arrays of values with different types in JSON. To use the previous behaviour, disable settin...
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d90857f2-b5e2-4cc8-bb59-af0c877cbb7b
Disable quoting 64 bit integers in JSON formats by default. #74079 ( Pavel Kruglov ) New Feature Basic support for the PromQL dialect is added. To use it, set dialect='promql' in clickhouse-client, point it to the TimeSeries table using the setting promql_table_name='X' and execute queries like rate(Clic...
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4be0eede-498a-48a7-a331-b62105e49ba6
Iceberg: support writing version-hint file. This closes #85097 . #85130 ( Konstantin Vedernikov ). Views, created by ephemeral users, will now store a copy of an actual user and will no longer be invalidated after the ephemeral user is deleted. #84763 ( pufit ). The vector similarity index now supports binary ...
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7bfc0dad-f5b9-4442-ba7c-25325c928ce7
Add extra_credentials to AzureBlobStorage to authenticate with client_id and tenant_id. #84235 ( Pablo Marcos ). Added function dateTimeToUUIDv7 to convert a DateTime value to a UUIDv7. Example usage: SELECT dateTimeToUUIDv7(toDateTime('2025-08-15 18:57:56')) returns 0198af18-8320-7a7d-abd3-358db23b9d5c . #84...
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76df73f6-d57c-47e8-ad5f-8f6ccc118ec7
Replaced the official HTTP transport in Azure library with our own HTTP client implementation for Azure Blob Storage. Introduced multiple settings for this clients which mirror settings from S3. Introduced aggressive connection timeouts for both Azure and S3. Improved introspection into Azure profile events and metrics...
{"source_file": "index.md"}
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f8c14d22-08f3-4d13-a134-ec97b8009038
Process higher granularity min-max indexes first. Closes #75381 . #83798 ( Maruth Goyal ). Make DISTINCT window aggregates run in linear time and fix a bug in sumDistinct . Closes #79792 . Closes #52253 . #79859 ( Nihal Z. Miaji ). Vector search queries using a vector similarity index complete with lower ...
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606b52ea-484d-47ed-989c-c8c9afc860b1
Fixed the calculation of the minimal task size for parallel replicas. #84752 ( Nikita Taranov ). Improved performance of applying patch parts in Join mode. #85040 ( Anton Popov ). Remove zero byte. Closes #85062 . A few minor bugs were fixed. Functions structureToProtobufSchema , structureToCapnProtoSchema...
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c508d084-d113-49ef-86af-1fe80b5498ee
Reduce query memory tracking overhead for executable user-defined functions. #83929 ( Eduard Karacharov ). Implement internal delta-kernel-rs filtering (statistics and partition pruning) in storage DeltaLake . #84006 ( Kseniia Sumarokova ). Disable skipping indexes that depend on columns updated on the fly o...
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185b51dd-cdbc-4379-9220-845ea9bf30e0
Add a CLI flag --show_secrets to clickhouse format to hide sensitive data by default. #81524 ( Nikolai Ryzhov ). S3 read and write requests are throttled on the HTTP socket level (instead of whole S3 requests) to avoid issues with max_remote_read_network_bandwidth_for_server and max_remote_write_network_bandwidt...
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1543bfad-b09e-45ca-b76b-9c66860b33aa
Slightly better-looking dots on the dashboard. #84074 ( Alexey Milovidov ). Dashboard now has a slightly better favicon. #84076 ( Alexey Milovidov ). Web UI: Give browsers a chance to save the password. Also, it will remember the URL values. #84087 ( Alexey Milovidov ). Add support for applying extra ACL on...
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b95543ea-2cbe-4ba2-891f-4ac14c198c9e
S3Queue ordered mode fix: quit earlier if shutdown was called. #84463 ( Kseniia Sumarokova ). Support iceberg writes to read from pyiceberg. #84466 ( Konstantin Vedernikov ). Allow set values type casting when pushing down IN / GLOBAL IN filters over KeyValue storage primary keys (e.g., EmbeddedRocksDB, Kee...
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611bb750-bf72-40c4-adf8-fc10923fb424
Async logging: Make limits tuneable and add introspection. #85105 ( Raúl Marín ). Collect all removed objects to execute single object storage remove operation. #85316 ( Mikhail Artemenko ). Iceberg's current implementation of positional delete files keeps all data in RAM. This can be quite expensive if the pos...
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5aab428b-57b9-4889-8603-6efef631efde
Fix markReplicasActive in DDLWorker and DatabaseReplicatedDDLWorker. #81395 ( Tuan Pham Anh ). Fix rollback of Dynamic column on parsing failure. #82169 ( Pavel Kruglov ). If function trim called with all-constant inputs now produces a constant output string. (Bug #78796 ). #82900 ( Robert Schulze ). Fix...
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6f01b939-4656-44df-b8f5-36b262c98145
Always apply filesystem_prefetches_limit (not only from MergeTreePrefetchedReadPool ). #83999 ( Azat Khuzhin ). Fix rare bug when MATERIALIZE COLUMN query could lead to unexpected files in checksums.txt and eventually detached data parts. #84007 ( alesapin ). Fix the logical error Expected single dictio...
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133b23a3-ebef-4584-a96b-5700e3b30002
Fix reading Variant column with lazy materialization. #84400 ( Pavel Kruglov ). Make zoutofmemory hardware error, otherwise it will throw logical error. see https://github.com/clickhouse/clickhouse-core-incidents/issues/877. #84420 ( Han Fei ). Fixed server crash when a user created with no_password attempt...
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a7abc04b-f59a-4812-ba0d-1228797b3ef8
The ngram and no_op tokenizers no longer crash the (experimental) text index for empty input tokens. #84849 ( Robert Schulze ). Fixed lightweight updates for tables with ReplacingMergeTree and CollapsingMergeTree engines. #84851 ( Anton Popov ). Correctly store all settings in table metadata for tables ...
{"source_file": "index.md"}
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039d0dec-8bd0-43b0-9d62-b2985465ea67
Fix race in DeltaLake engine delta-kernel implementation. #85221 ( Kseniia Sumarokova ). Fix reading partitioned data with disabled delta-kernel in DeltaLake engine. It was broken in 25.7 (https://github.com/ClickHouse/ClickHouse/pull/81136). #85223 ( Kseniia Sumarokova ). Added missing table name length ch...
{"source_file": "index.md"}
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37e5dbd1-1db6-464c-98a2-59f68f0448a4
Fix reading count from cache for delta lake. #85704 ( Kseniia Sumarokova ). Fix coalescing merge tree segfault for large strings. This closes #84582 . #85709 ( Konstantin Vedernikov ). Update metadata timestamp in iceberg writes. #85711 ( Konstantin Vedernikov ). Using distributed_depth as an indicator o...
{"source_file": "index.md"}
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bfcaf6fd-cdd4-4542-a9ca-33acf632c470
Bumped the internal libxml2 from 2.14.4 to 2.14.5. #84230 ( Robert Schulze ). Bumped internal curl from 8.14.0 to 8.15.0. #84231 ( Robert Schulze ). Now we use less memory for caches in CI and have better tests for eviction. #84676 ( alesapin ). ClickHouse release 25.7, 2025-07-24 {#257} Backward Incomp...
{"source_file": "index.md"}
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0b652eb9-4bf0-4dfe-9dc4-33ab1cd1a757
Support complex types in Iceberg schema evolution. #73714 ( Konstantin Vedernikov ). Introduce support for INSERTs into Iceberg tables. #82692 ( Konstantin Vedernikov ). Read Iceberg data files by field ids. This improves compatibility with Iceberg: the fields can be renamed in the metadata while being mapped t...
{"source_file": "index.md"}
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8c47486a-44a1-4b26-90d0-1786ee41ef96
Added SQL functions colorSRGBToOkLCH and colorOkLCHToSRGB for converting colours between the sRGB and OkLCH colour spaces. #83679 ( Fgrtue ). Allow parameters in CREATE USER queries for usernames. #81387 ( Diskein ). The system.formats table now contains extended information about formats, such as HTTP ...
{"source_file": "index.md"}
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04681b01-4608-4df5-bcb5-4d2d919f0209
Trivial optimization for -If combinator. #78454 ( 李扬 ). Vector search queries using a vector similarity index complete with lower latency due to reduced storage reads and reduced CPU usage. #79103 ( Shankar Iyer ). Respect merge_tree_min_{rows,bytes}_for_seek in filterPartsByQueryConditionCache to align i...
{"source_file": "index.md"}
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a3d3c473-d5b7-4ad5-8a48-85c4966051e2
Optimize MergeTreeReadersChain::getSampleBlock that speeds up short queries. #83875 ( Raúl Marín ). Speedup tables listing in data catalogs by asynchronous requests. #81084 ( alesapin ). Introduce jitter to the S3 retry mechanism when the s3_slow_all_threads_after_network_error configuration is enabled. #8...
{"source_file": "index.md"}
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ac069a39-e431-4b14-9858-020695166ec7
Count consumed messages manually to avoid depending on previous committed offset in StorageKafka2. #81662 ( János Benjamin Antal ). Added clickhouse-keeper-utils , a new command-line tool for managing and analyzing ClickHouse Keeper data. The tool supports dumping state from snapshots and changelogs, analyzing cha...
{"source_file": "index.md"}
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2b0853e8-1c3c-4d1e-83e6-fcd8739790a7
Keeper improvement: add new config keeper_server.cleanup_old_and_ignore_new_acl . If enabled, all nodes will have their ACLs cleared while ACL for new requests will be ignored. If the goal is to completely remove ACL from nodes, it's important to leave the config enabled until a new snapshot is created. #82496 ( Ant...
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df14863b-b741-44b9-8edd-60f3943e4dbb
Add columns commit_time , commit_id to system.s3queue_log . #83016 ( Kseniia Sumarokova ). In some cases, we need to have multiple dimensions to our metrics. For example, counting failed merges or mutations by error codes rather than having a single counter. Introduce system.dimensional_metrics , which does p...
{"source_file": "index.md"}
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f7cea55a-7dbb-4ab6-95ff-ab0f16ab9a8f
Enable Date / Date32 as integers in JSON input formats. #83597 ( MikhailBurdukov ). Made exception messages for certain situations for loading and adding projections easier to read. #83728 ( Robert Schulze ). Introduce a configuration option to skip binary checksum integrity checks for clickhouse-server . ...
{"source_file": "index.md"}
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268f4e99-30be-41ff-9fa3-14c3deb99b15
For some queries executed with parallel replicas, reading in order optimization(s) could be applied on initiator while can't be applied on remote nodes. It leads to different reading modes used by parallel replicas coordinator (on initiator) and on remoted nodes, which is a logical error. #80652 ( Igor Nikonov ). F...
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932cb1d5-ec0f-448b-b504-c122299f6a25
Fix data races in Iceberg. #82088 ( Azat Khuzhin ). Fix DatabaseReplicated::getClusterImpl . If the first element (or elements) of hosts has id == DROPPED_MARK and there are no other elements for the same shard, the first element of shards will be an empty vector, leading to std::out_of_range . #82093 ( M...
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fbff9a21-c429-443d-bc75-c96438b4ab2c
Fix disabling boundary alignment for cached buffer in external table engines. It was broken in https://github.com/ClickHouse/ClickHouse/pull/81868. #82493 ( Kseniia Sumarokova ). Fix the crash if key-value storage is joined with a type-casted key. #82497 ( Pervakov Grigorii ). Fix hiding named collection values...
{"source_file": "index.md"}
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13975e37-d843-4768-a537-8fa888d6bee6
Fix filter modification for queries with a JOIN expression with a table with storage Merge . Fixes #82092 . #82950 ( Dmitry Novik ). Fix LOGICAL_ERROR in QueryMetricLog: Mutex cannot be NULL. #82979 ( Pablo Marcos ). Fixed incorrect output of function formatDateTime when formatter %f is used together with...
{"source_file": "index.md"}
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c78a5fa3-f646-41c5-9521-56dc1ed70a46
Disable bounds-based file pruning for iceberg array element and iceberg map values, including all their nested subfields. #83520 ( Daniil Ivanik ). Fix possible file cache not initialized errors when it's used as a temporary data storage. #83539 ( Bharat Nallan ). Keeper fix: update total watch count correctly ...
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39132426-dbe0-42a3-b572-1d3cbff5900c
ClickHouse release 25.6, 2025-06-26 {#256} Backward Incompatible Change Previously, function countMatches would stop counting at the first empty match even if the pattern accepts it. To overcome this issue, countMatches now continues execution by advancing by a single character when an empty match occurs. Use...
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8a2fa2ff-b27e-40a5-ad27-3d895d9a503f
Support writing JSON columns to Parquet and reading JSON columns from Parquet directly. #79649 ( Nihal Z. Miaji ). Add MultiPolygon support for pointInPolygon . #79773 ( Nihal Z. Miaji ). Add support for querying local filesystem-mounted Delta tables via deltaLakeLocal table function. #79781 ( ro...
{"source_file": "index.md"}
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e5bcb753-c741-46af-a82f-03c51fdbbac5
An improvement for the experimental text index: explicit parameters are supported via key-value pairs. Currently, supported parameters are a mandatory tokenizer and two optional max_rows_per_postings_list and ngram_size . #80262 ( Elmi Ahmadov ). Previously, packed storage was not supported for the full-text...
{"source_file": "index.md"}
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8dd35f21-99de-45eb-98d5-003abb75ca17
Improve shutdown speed of Kafka engine (remove extra 3 seconds delay in case of multiple Kafka tables). #80796 ( Azat Khuzhin ). Async inserts: reduce memory usage and improve performance of insert queries. #80972 ( Raúl Marín ). Don't profile processors if the log table is disabled. #81256 ( Raúl Marín )...
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59fe94c8-8990-4d8e-9532-85d10ea7c5b3
Add _time virtual column in S3Queue , AzureQueue engine. #78926 ( Anton Ivashkin ). Make settings controlling connection drop on overloaded CPU hot-reloadable. #79052 ( Alexey Katsman ). Add container prefix to data paths reported in system.tables for plain disks in Azure blob storage, making reporting con...
{"source_file": "index.md"}
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8547751a-e360-4c2a-99ca-50bb4c724e1b
Lowered the log level of merged parts messages. #80476 ( Hans Krutzer ). Change the default behavior of partition pruning for Iceberg tables. #80583 ( Melvyn Peignon ). Add two new ProfileEvents for index search algorithm observability: IndexBinarySearchAlgorithm and IndexGenericExclusionSearchAlgorithm . #...
{"source_file": "index.md"}
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a721c229-6b85-49ae-adf8-165099668232
Fix highlighting of PARTITION BY in INSERT queries. In previous versions, PARTITION BY was not highlighted as a keyword. #81106 ( Alexey Milovidov ). Two mini improvements in Web UI: - correctly handle queries without output, such as CREATE , INSERT (until recently, these queries resulted in an infinite sp...
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533a0cda-8dfe-4267-908f-92c8b67897a4
Bug Fix (user-visible misbehavior in an official stable release) Fix parameterized view with SELECT EXCEPT query. Closes #49447 . #57380 ( Nikolay Degterinsky ). Analyzer: Fix column projection name after column type promotion in join. Closes #63345 . #63519 ( Dmitry Novik ). Fixed a logical error in case...
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84db0da1-8294-4efd-8bc7-92c818db7b5e
Skip indexes with lambda expressions could not be applied. Fix the case when high-level functions in the index definition exactly match the one in the query. #80025 ( Nikolai Kochetov ). Fix metadata version during attach part on the replica executing ATTACH_PART command from replication log. #80038 ( Aleksei Fil...
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e5c4a9aa-cfe2-43f1-835e-112a0c4727da
Fix possible SSH protocol (due to hang in replxx). #80688 ( Azat Khuzhin ). The timestamp in the iceberg_history table should now be correct. #80711 ( Melvyn Peignon ). Fix possible crash in case of dictionary registration failed (when CREATE DICTIONARY failed with CANNOT_SCHEDULE_TASK it is possible to lea...
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8bf22d2f-227c-41e7-aa4b-454e8148b8af
Now ClickHouse will ignore errors and unexpected responses from data lake catalogs in SHOW TABLES query. Fixes #79725 . #81046 ( alesapin ). Fix parsing of DateTime64 from integers in JSONExtract and JSON type parsing. #81050 ( Pavel Kruglov ). Reflect date_time_input_format setting in schema inference cache...
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93098a02-c6ae-4259-ac5d-091e883aa213
Backported in #81957 : Fixed possible crash in Aggregator in case of exception during merge. #81450 ( Nikita Taranov ). Don't store content of several manifest files in memory. #81470 ( Daniil Ivanik ). Fix possible crash during shutting down background pools ( background_.*pool_size ). #81473 ( Azat Khuzh...
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95d6655f-89c8-4b98-935f-a56e8a681591
In previous versions, the server returned excessive content for requests to /js . This closes #61890 . #81895 ( Alexey Milovidov ). Previously, MongoDB table engine definitions could include a path component in the host:port argument which was silently ignored. The mongodb integration refuses to load such tab...
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aedc348b-00db-4474-a7cf-a1aed6db4e36
ClickHouse release 25.5, 2025-05-22 {#255} Backward Incompatible Change Function geoToH3 now accepts the input in the order (lat, lon, res) (which is common for other geometric functions). Users who wish to retain the previous result order (lon, lat, res) can set setting geotoh3_argument_order = 'lon_lat' . #...
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72c1e176-de92-416a-8890-a9982e7cb756
Add stringBytesUniq and stringBytesEntropy functions to search for possibly random or encrypted data. #79350 ( Sachin Kumar Singh ). Added functions for encoding and decoding base32. #79809 ( Joanna Hulboj ). Add getServerSetting and getMergeTreeSetting function. Closes #78318. #78439 ( NamNguyenHoai ...
{"source_file": "index.md"}
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8d11dfe0-7cb8-41ad-bf87-4f209935e82e
Speed up secondary indices by evaluating their expressions on multiple granules at once. #64109 ( Alexey Milovidov ). Enable compile_expressions (JIT compiler for fragments of ordinary expressions) by default. This closes #51264 and #56386 and #66486 . #79907 ( Alexey Milovidov ). New setting introduced:...
{"source_file": "index.md"}
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a9d570f9-76b6-489f-a690-68f70d1f492d
Set input_format_parquet_bloom_filter_push_down to true by default. Also, fix a mistake in the settings changes history. #80058 ( Alexey Milovidov ). Optimized ALTER ... DELETE mutations for parts in which all rows should be deleted. Now, in such cases an empty part is created instead of original without execut...
{"source_file": "index.md"}
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dfd2572f-f377-4788-a42c-5a74327a1427
The tokens function was extended to accept an additional "tokenizer" argument plus further tokenizer-specific arguments. #79001 ( Elmi Ahmadov ). The SHOW CLUSTER statement now expands macros (if any) in its argument. #79006 ( arf42 ). Hash functions now support NULL s inside arrays, tuples, and maps. (iss...
{"source_file": "index.md"}
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967d82fa-f420-4f0f-88c7-c51ac7cd07e6
Add filesystem cache setting max_size_ratio_to_total_space . #79460 ( Kseniia Sumarokova ). For clickhouse-benchmark reconfigure reconnect option to take 0, 1 or N as values for reconnecting accordingly. #79465 ( Sachin Kumar Singh ). Allow ALTER TABLE ... MOVE|REPLACE PARTITION for tables on different ...
{"source_file": "index.md"}
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d5408a97-6793-4be1-8787-83976db9bc34
Fix renames of columns missing in part. #76346 ( Anton Popov ). A materialized view can start too late, e.g. after the Kafka table that streams to it. #72123 ( Ilya Golshtein ). Fix SELECT query rewriting during VIEW creation with enabled analyzer. closes #75956 . #76356 ( Dmitry Novik ). Fix applying ...
{"source_file": "index.md"}
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4f3ac6f2-29c1-4ad5-a826-043155f83cfa
Throw an exception when the parquet batch size is set to 0. Previously when output_format_parquet_batch_size = 0 ClickHouse would hang. Now this behavior is fixed. #78991 ( daryawessely ). Fix deserialization of variant discriminators with basic format in compact parts. It was introduced in https://github.com/Click...
{"source_file": "index.md"}
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5bbb2655-ca1d-4737-b0be-7e4aedaed574
Fix result duplication when reading from remote with both use_hedged_requests and allow_experimental_parallel_reading_from_replicas disabled. #79599 ( Eduard Karacharov ). Fix crash in delta-kernel implementation when using unity catalog. #79677 ( Kseniia Sumarokova ). Resolve macros for autodiscovery clust...
{"source_file": "index.md"}
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22b4aa53-86ae-43de-9fd4-7cf9533ca27b
Query to system database can hang if system database metadata located in keeper. #79304 ( Mikhail Artemenko ). Build/Testing/Packaging Improvement Make it possible to reuse the built chcache binary instead of always rebuilding it. #78851 ( János Benjamin Antal ). Add NATS pause waiting. #78987 ( Dmitr...
{"source_file": "index.md"}
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0973216a-3e5c-4976-8140-07d17e69f7c5
Support partition pruning in DeltaLake. #78486 ( Kseniia Sumarokova ). Support for a background refresh in readonly MergeTree tables which allows querying updateable tables with an infinite amount of distributed readers (ClickHouse-native data lake). #76467 ( Alexey Milovidov ). Support using custom disks to ...
{"source_file": "index.md"}
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67aad574-3056-4a87-b4ee-e25d34a228bb
Optimize performance with lazy columns, that read the data after ORDER BY and LIMIT. #55518 ( Xiaozhe Yu ). Enabled the query condition cache by default. #79080 ( Alexey Milovidov ). Speed-up building JOIN result by de-virtualizing calls to col->insertFrom() . #77350 ( Alexander Gololobov ). Merge equality...
{"source_file": "index.md"}
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522529a7-8e80-4813-9211-f8c854c9e9c3
The hasAll function can now take advantage of the tokenbf_v1 , ngrambf_v1 full-text skipping indices. #77662 ( UnamedRus ). Vector similarity index could over-allocate main memory by up to 2x. This fix reworks the memory allocation strategy, reducing the memory consumption and improving the effectiveness of th...
{"source_file": "index.md"}
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7ac972f0-2d39-41de-bc4f-5874a86eb374
Don't parse special Bool values in text formats inside Variant type by default. It can be enabled using setting allow_special_bool_values_inside_variant . #76974 ( Pavel Kruglov ). Support configurable per task waiting time of low priority query in session level and in server level. #77013 ( VicoWu ). Im...
{"source_file": "index.md"}
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580d68c3-0423-44fe-95ed-99ca0d1069fb
Add a dynamic warning to the system.warnings table for long running mutations. #78658 ( Bharat Nallan ). Added field condition to system table system.query_condition_cache . It stores the plaintext condition whose hash is used as a key in the query condition cache. #78671 ( Robert Schulze ). Allow an empty...
{"source_file": "index.md"}
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eb84c257-f1ab-4ada-9a32-7d6faa9bcf29
Fix possible crash when NOT_FOUND_COLUMN_IN_BLOCK error occurs. #77854 ( Vladimir Cherkasov ). Fix crash that happens in the S3/AzureQueue while filling data. #77878 ( Bharat Nallan ). Disable fuzzy search for history in SSH server (since it requires the skim library). #78002 ( Azat Khuzhin ). Fixes a bug...
{"source_file": "index.md"}
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6e024db5-1ca3-45ac-bc90-83344ab13d11
Validate access to underlying tables for the Merge engine. #78339 ( Pervakov Grigorii ). FINAL modifier can be ignored when querying a Distributed table. #78428 ( Yakov Olkhovskiy ). bitmapMin returns the uint32_max when the bitmap is empty (and uint64_max when the input type is larger), which matches the...
{"source_file": "index.md"}
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25235170-19c0-4956-820b-f6b414704232
Fix crash in Refreshable MATERIALIZED VIEW inthe case of ALTER after an incorrect shutdown. #78858 ( Azat Khuzhin ). Fix parsing of bad DateTime values in CSV format. #78919 ( Pavel Kruglov ). Keeper fix: Avoid triggering watches on failed multi requests. #79247 ( Antonio Andelic ). Fix reading Iceberg...
{"source_file": "index.md"}
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01f27e84-1c40-49f1-991e-79d7f3ef6f5b
Support LowCardinality(Decimal) data types #72256 . #72833 ( zhanglistar ). FilterTransformPassedRows and FilterTransformPassedBytes profile events will show the number of rows and number of bytes filtered during the query execution. #76662 ( Onkar Deshpande ). Support for the histogram metric type. The i...
{"source_file": "index.md"}
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f52d736c-20b5-4d30-800e-3844879d491c
Faster ClickHouse servers shutdown (get rid of 2.5sec delay). #76550 ( Azat Khuzhin ). Avoid excess allocation in ReadBufferFromS3 and other remote reading buffers, reduce their memory consumption in half. #76692 ( Sema Checherinda ). Update zstd from 1.5.5 to 1.5.7 which could lead to some performance improve...
{"source_file": "index.md"}
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f5988f0a-f7d4-4228-a6e7-383fd19f9f3b
Upgraded librdkafka (which is a pile of crap) to version 2.8.0 (the pile does not get any better) and improved the shutdown sequence for Kafka tables, reducing delays during table drops and server restarts. The engine=Kafka no longer explicitly leaves the consumer group when a table is dropped. Instead, the consumer ...
{"source_file": "index.md"}
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38b3204d-524e-4aa2-96e6-7e816690e192
Fix data loss when enable async insert and insert into ... from file ... with unequal block size if the first block size < async_max_size but the second block > async_max_size, the second block will not be inserted. these data is left in squashing . #76343 ( Han Fei ). Renamed field 'marks' to 'marks_bytes' in sy...
{"source_file": "index.md"}
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aa687dee-c152-4802-91bb-424dd9f2febd
Fix sorting of BFloat16 values. This closes #75487 . This closes #75669 . #77000 ( Alexey Milovidov ). Bug fix JSON with Variant subcolumn by adding check to skip ephemeral subcolumns in part consistency check. #72187 . #77034 ( Smita Kulkarni ). Fix crash in template parsing in Values format in case of ty...
{"source_file": "index.md"}
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3a98b5d7-16f8-4730-a0a4-d4a29760005a
In filesystem cache impementation fix error processing during file segment write. #77471 ( Kseniia Sumarokova ). Make DatabaseIceberg use correct metadata file provided by catalog. Closes #75187 . #77486 ( Kseniia Sumarokova ). The query cache now assumes that UDFs are non-deterministic. Accordingly, results o...
{"source_file": "index.md"}
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e2ae0232-0458-40b2-9f91-ccbf39a48a01
New Feature Support type Nullable(JSON) . #73556 ( Pavel Kruglov ). Support subcolumns in the DEFAULT and MATERIALIZED expressions. #74403 ( Pavel Kruglov ). Support writing Parquet bloom filters using the output_format_parquet_write_bloom_filter setting (enabled by default). #71681 ( Michael Kolupaev ...
{"source_file": "index.md"}
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5cfe1757-a8aa-4528-be58-604b02f67a68
Fixed unnecessary contention in parallel_hash when max_rows_in_join = max_bytes_in_join = 0 . #75155 ( Nikita Taranov ). Fixed double preallocation in ConcurrentHashJoin in case join sides are swapped by the optimizer. #75149 ( Nikita Taranov ). Slight improvement in some join scenarios: precalculate the n...
{"source_file": "index.md"}
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37a65e6a-9838-437d-9403-28538b22975b
Add support for groupUniqArrayArrayMap as SimpleAggregateFunction . #75034 ( Miel Donkers ). Hide catalog credential settings in database engine Iceberg . Closes #74559 . #75080 ( Kseniia Sumarokova ). intExp2 / intExp10 : Define undefined behaviour: return 0 for too small argument, 18446744073709551615...
{"source_file": "index.md"}
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3fd676b6-7da4-499c-89d9-c8e41cce3096
Querying system.tables will not throw even if there is a Merge table created over a database that no longer exists. Remove the getTotalRows method from Hive tables because we don't allow it to do complex work. #75772 ( Alexey Milovidov ). Store start_time/end_time for Backups with microseconds. #75929 ( A...
{"source_file": "index.md"}
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912a2f7c-7779-4fe5-8315-17738705960a
Fix negate function monotonicity. In previous versions, the query select * from a where -x = -42; where x is the primary key, can return a wrong result. #71440 ( Michael Kolupaev ). Fix empty tuple handling in arrayIntersect. This fixes #72578 . #72581 ( Amos Bird ). Fix reading JSON sub-object subcolumns ...
{"source_file": "index.md"}
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8fe38237-8164-492d-b602-c6b67c9f4f8f
Fix leaving connection in a bad state in client after INSERT exceptions. #75030 ( Azat Khuzhin ). Fix crash due to uncaught exception in PSQL replication. #75062 ( Azat Khuzhin ). Sasl can fail any rpc call, the fix helps to repeat the call in case if krb5 ticker is expired. #75063 ( inv2004 ). Fixed usage ...
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36be67f1-7a44-446d-ada2-ba8de82e4f09
Fix data corruption with CODEC(ZSTD, DoubleDelta) . Closes #70031 . #75548 ( Konstantin Bogdanov ). Fix interaction between allow_feature_tier and compatibility mergetree setting. #75635 ( Raúl Marín ). Fix incorrect processed_rows value in system.s3queue_log in case file was retried. #75666 ( Kseniia Sumar...
{"source_file": "index.md"}
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ffe2e4d0-f39d-4aec-ba70-68adbfbd9d2e
We happened to use JSON serialization for some metadata, which was a mistake, because JSON does not support binary data inside string literals, including zero bytes. SQL queries can contain binary data and invalid UTF-8, so we have to support this in our metadata files as well. At the same time, ClickHouse's JSONEachR...
{"source_file": "index.md"}
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bee49e27-45a4-48b4-8997-c99fa07adfff
Remove about 20MB of dead code from the binary. #76226 ( Alexey Milovidov ). ClickHouse release 25.1, 2025-01-28 {#251} Backward Incompatible Change JSONEachRowWithProgress will write the progress whenever the progress happens. In previous versions, the progress was shown only after each block of the resul...
{"source_file": "index.md"}
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887eb25e-3b32-47b6-9193-d9f23f8564f7
New Feature Added an ability to apply non-finished (not materialized by background process) mutations during the execution of SELECT queries immediately after submitting. It can be enabled by setting apply_mutations_on_fly . #74877 ( Anton Popov ). Implement Iceberg tables partition pruning for time-relate...
{"source_file": "index.md"}
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14af4e2d-8b86-4e4f-a352-07498bdb9b66
Now, the embedded Web UI has a progress bar during query runtime. It allows cancelling queries. It displays the total number of records and the extended information about the speed. The table can be rendered incrementally as soon as data arrives. Enable HTTP compression. Rendering of the table became faster. The table ...
{"source_file": "index.md"}
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626b39d2-5404-4aab-a18b-0ca34bb00dda
Support predicate push down optimization on the query plan level for the MergingAggregated step. It improves performance for some queries with the analyzer. #74073 ( Nikolai Kochetov ). Splitting of left table blocks by hash was removed from the probe phase of the parallel_hash JOIN algorithm. #73089 ( Nikita...
{"source_file": "index.md"}
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ef18451f-f2d0-4520-83d8-73f02be62f7d
Added a merge tree setting materialize_skip_indexes_on_merge which suppresses the creation of skip indexes during merge. This allows users to control explicitly (via ALTER TABLE [..] MATERIALIZE INDEX [...] ) when skip indexes are created. This can be useful if skip indexes are expensive to build (e.g. vector simila...
{"source_file": "index.md"}
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5ba8aa99-8a63-4630-a8c8-38caa2f1dfe1
Make Pretty formats prettier: squash blocks if not much time passed since the output of the previous block. This is controlled by new settings output_format_pretty_squash_consecutive_ms (50 ms by default) and output_format_pretty_squash_max_wait_ms (1000 ms by default). Continuation of #49537 . This closes #491...
{"source_file": "index.md"}
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d16784ef-6e68-4521-9ae9-d50a72054e09
Support writing orc file by custom time zone, not always by the GMT time zone. #70615 ( kevinyhzou ). Respect IO scheduling settings when writing backups across clouds. #71093 ( János Benjamin Antal ). Add metric column alias name to system.asynchronous_metrics . #71164 ( megao ). Historically for ...
{"source_file": "index.md"}
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3e804642-01d4-4fac-b95d-f8be6b95d8bc
Reducing the log level for appearing replicated parts in the ReplicatedMergeTree engine to help minimize the volume of logs generated in a replicated cluster. #72876 ( mor-akamai ). Improve extraction of common expression in disjunctions. Allow simplifying the resulting filter expression even if there's no common s...
{"source_file": "index.md"}
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