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ClickHouse

76 indexed repositories · View on GitHub

ClickHouse
ClickHouse® is a real-time analytics database management system

C++ · 49890 stars
clickhouse-go
Golang driver for ClickHouse

Go · 3343 stars
clickhouse-java
ClickHouse Java Clients & JDBC Driver

Java · 1617 stars
ClickBench
ClickBench: a Benchmark For Analytical Databases

Shell · 1106 stars
mcp-clickhouse
Connect ClickHouse to your AI assistants.

Python · 871 stars
clickhouse-rs
Official pure Rust typed client for ClickHouse DB

Rust · 559 stars
agent-skills
The official Agent Skills for ClickHouse and ClickHouse Cloud

TypeScript · 535 stars
clickhouse-connect
Python driver/sqlalchemy/superset connectors

Python · 521 stars
adsb.exposed
Interactive visualization and analytics on ADS-B data with ClickHouse

JavaScript · 459 stars
ch-go
Low-level Go Client for ClickHouse

Go · 428 stars
clickhouse-cpp
C++ client library for ClickHouse

C · 382 stars
dbt-clickhouse
The Clickhouse plugin for dbt (data build tool)

Python · 362 stars
clickhouse-js
Official JS client for ClickHouse DB

TypeScript · 331 stars
silk
Fast stackful fibers with a NUMA-aware work-stealing scheduler

C++ · 325 stars
NoiSQL
NoiSQL — Generating Music With SQL Queries

SQL · 293 stars
clickhouse-operator
Official Kubernetes Operator for ClickHouse®

Go · 292 stars
clickhouse-odbc
ODBC driver for ClickHouse

C · 285 stars
pg_clickhouse
Interfaces to query ClickHouse databases from PostgreSQL

C · 283 stars
graphouse
Graphouse allows you to use ClickHouse as a Graphite storage.

Java · 261 stars
spark-clickhouse-connector
Spark ClickHouse Connector build on DataSourceV2 API

Scala · 217 stars
56 more repositories live on View on GitHub

Open All

Support non bankers round() for floats (under the setting) Open

comp-regular-function external feature

ClickHouse/ClickHouse#8645 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Default cluster for distributed DDL Open

comp-ddl easy task feature help wanted

ClickHouse/ClickHouse#8676 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
optimization for 'multi-level' group by Open

comp-query-optimizer external feature

ClickHouse/ClickHouse#8703 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Implementing rolling operations for unevenly spaced time series Open

comp-aggregate-functions external feature

ClickHouse/ClickHouse#8747 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Query optimization: rewrite GROUP BY with LIMIT to DISTINCT. Open

comp-query-optimizer feature performance

ClickHouse/ClickHouse#8777 · 0 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Optimization for distributed GROUP BY with ORDER BY without aggregate functions. Open

comp-query-optimizer feature performance

ClickHouse/ClickHouse#8829 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Transfer less amount of data over network for distributed aggregation query with ORDER BY sublinear aggregate functions DESC and LIMIT Open

comp-distributed feature minor performance

ClickHouse/ClickHouse#8847 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Allow to use arbitrary queries (e.g. DESCRIBE) in a subquery Open

comp-table-functions external feature st-accepted

ClickHouse/ClickHouse#8854 · 3 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
min_bytes_to_use_direct_io_for_fetches Open

comp-replication easy task feature minor

ClickHouse/ClickHouse#9140 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Filesystem path functions Open

comp-regular-function external feature

ClickHouse/ClickHouse#9256 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Changing configuration parameters in command line doesn't work for clickhouse-benchmark. Open

comp-cli minor unfinished code

ClickHouse/ClickHouse#9347 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Generic selector for materialized and virtual columns Open

comp-query-analyzer external feature

ClickHouse/ClickHouse#9460 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Data loss in SummingMergeTree table with nested record after merging parts Open

comp-mergetree external unexpected behaviour

ClickHouse/ClickHouse#9462 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
max_execution_time should be checked when receiving "keep alive" packets. Open

comp-query-execution enhancement

ClickHouse/ClickHouse#9509 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
'group_by_each_block_no_merge' setting Open

comp-aggregation feature warmup task

ClickHouse/ClickHouse#9604 · 7 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Excessive substitution of aliases Open

comp-query-analyzer feature st-discussion

ClickHouse/ClickHouse#9715 · 24 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
force_drop_table doesn't work for (orphaned?) hidden materialized view tables Open

comp-materialized-view external

ClickHouse/ClickHouse#9802 · 0 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
Table columns structure in ZooKeeper is different from local table structure Open

comp-replication external feature st-accepted usability

ClickHouse/ClickHouse#10074 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Add ClickHouse test to PerfKitBenchmarker Open

comp-ci-infrastructure feature help wanted

ClickHouse/ClickHouse#10296 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
date format like oracle NLS_CALENDAR Open

comp-datetime external feature minor

ClickHouse/ClickHouse#10394 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Configuration of server log is not applied until restart Open

comp-logging enhancement external

ClickHouse/ClickHouse#10438 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Allow to execute ALTER MODIFY type of key column if the type is expanded. Open

comp-mutations feature

ClickHouse/ClickHouse#10535 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Synchronous mode of distributed INSERTs with fallback to asynchronous mode. Open

comp-distributed feature

ClickHouse/ClickHouse#10681 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Push down GROUP BY into subqueries with Distributed tables Open

comp-query-optimizer feature minor

ClickHouse/ClickHouse#10710 · 3 comments · 8 reactions · 0 assignees · Indexed Sep 15, 2026
Memory usage is larger than needed. Open

comp-aggregation memory unexpected behaviour

ClickHouse/ClickHouse#10818 · 16 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Partition prune should work when only partition columns used in a udf in where condition Open

comp-query-analyzer external feature performance

ClickHouse/ClickHouse#10906 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support nested fields in MongoDB dictionaries Open

comp-dictionary comp-foreign-db external feature

ClickHouse/ClickHouse#10919 · 1 comment · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Unexpected behavior of the JSONExtractArrayRaw Open

comp-regular-function external unexpected behaviour

ClickHouse/ClickHouse#10979 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ALTER TABLE COMMENT COLUMN for Materialized View with ReplicatedAggregatingMergeTree engine doesn't propagate to all replicas. Open

comp-materialized-view usability

ClickHouse/ClickHouse#11075 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Performance optimization: getColumnNameWithMinumumCompressedSize not always needed Open

comp-mergetree performance

ClickHouse/ClickHouse#11090 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Implement a way to ALTER unreplicated tables ON CLUSTER with internal_replication=true Open

comp-ddl feature

ClickHouse/ClickHouse#11204 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
groupArray cpu utilization rate is low Open

comp-aggregation external performance

ClickHouse/ClickHouse#11698 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
GROUP BY push down optimization Open

comp-query-optimizer feature

ClickHouse/ClickHouse#11707 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Optimize boolean conditions using CNF / DNF Open

comp-query-optimizer external feature

ClickHouse/ClickHouse#11749 · 5 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Input formats: save unknown fields to a special column instead of skipping Open

comp-formats external feature

ClickHouse/ClickHouse#11775 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add ability to set custom programname for syslog logger Open

comp-logging easy task external help wanted usability

ClickHouse/ClickHouse#11784 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Not obvious error message [Attempt to read after eof: while converting '' to Int32] Open

comp-regular-function minor usability

ClickHouse/ClickHouse#11906 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support Lowcardinality(String) for summingMergTree Nested (sumMap) Open

comp-datatype-wrapper external feature

ClickHouse/ClickHouse#11925 · 4 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
allow_ddl option is not consistent over restarts Open

bug comp-ddl external usability

ClickHouse/ClickHouse#11942 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Name of the problematic table and column for insert time exceptions Open

comp-query-execution external usability

ClickHouse/ClickHouse#12084 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Combine multiple `hasAny` functions into one Open

comp-query-optimizer external feature performance

ClickHouse/ClickHouse#12462 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
sql of join many tables needs table Alias, while join two tables needs not Open

comp-joins external unexpected behaviour

ClickHouse/ClickHouse#12482 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ALTER USER renaming to default allowed Open

comp-rbac external usability

ClickHouse/ClickHouse#12575 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`remote()` and a database name with a dot Open

comp-table-functions external unexpected behaviour

ClickHouse/ClickHouse#12594 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Method optimize is not supported by storage Join Open

comp-simple-engines external feature

ClickHouse/ClickHouse#13320 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Increase the search conditions to achieve the purpose of narrowing the search scope, but the result is that more data is parsed, and the query becomes slower Open

comp-query-optimizer external performance

ClickHouse/ClickHouse#13401 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
'-Resample' combinator limitations Open

comp-aggregate-functions external usability

ClickHouse/ClickHouse#13493 · 16 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
DB::Exception: Newly added column B has a default expression, so adding expressions that use it to the sorting key is forbidden. Open

comp-mergetree external usability

ClickHouse/ClickHouse#13592 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tips about database schema. Open

comp-logging feature

ClickHouse/ClickHouse#13621 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
The setting 'merge_tree_min_bytes_for_concurrent_read' may be suboptimal. Open

comp-mergetree performance

ClickHouse/ClickHouse#13815 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

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