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ClickHouseยฎ is a real-time analytics database management system
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Click House v26.1.12.23-stable

Click House: v26.1.12.23-stable Release

Release date:
April 30, 2026
Previous version:
v26.1.11.9-stable (released April 15, 2026)
Magnitude:
80 Diff Delta
Contributors:
4 total committers
Data confidence:
Commits:
26 impacting commits

43 Features Released with v26.1.12.23-stable

Fix several optimizations after lightweight deletes [2]
#102900
Fix Parquet ColumnIndex stats min_value > max_value for String columns
#103334
Use `xz` 5.8.3
#102607
Cap pre-auth Hello packet strings to 64 KB and limit handshake time
#103284
Reduce default HTTP header limits to prevent pre-auth memory exhaustion
#103285
Fix ColumnReplicated type mismatch crash in merge algorithms
#101036
Apply max_network_bandwidth_for_{user,all_users} to remote filesystem reads/writes
#103080
Fix short writes in Poco BufferedStreamBuf::flushBuffer
#102894
Add histogram metrics for S3 read request duration and bytes
#102058
Use max_insert_threads for plain INSERTs without materialized views
#102961
Fix crash in cluster discovery static configuration
#102661
Fix using wrong extreams in min-max index created on JSON column
#101918
Reintroduce ArrowMemoryPool to allow throwing MEMORY_LIMIT_EXCEEDED to avoid kernel OOM
#102999
Expose per-thread untracked_memory in system.stack_trace
#103065
Hide secret key in HMAC SQL function
#102997
Check for malformed flattened Dynamic data in Native format
#103392
Populate `_time` column from `url` table function
#103437
Fix flattened Dynamic type serialization with binary encoded data types
#102692
Fix `LOGICAL_ERROR` in `S3Queue` concurrent `CREATE TABLE IF NOT EXISTS`
#102610
Fix wrong date data type inference in case of overflow after timezone adjustment
#102674
Optimize row policy OR-chains to IN in the new analyzer
#102915
Backport #102674 to 26.1: Fix wrong date data type inference in case of overflow after timezone adjustment
#102970
Backport #102607 to 26.1: Use `xz` 5.8.3
#102831
CI: disable automerge for backport branches
#103160
Backport #102661 to 26.1: Fix crash in cluster discovery static configuration
#103003
Backport #102915 to 26.1: Optimize row policy OR-chains to IN in the new analyzer
#103020
Backport #103160 to 26.1: CI: disable automerge for backport branches
#103177
Backport #102610 to 26.1: Fix `LOGICAL_ERROR` in `S3Queue` concurrent `CREATE TABLE IF NOT EXISTS`
#103146
Backport #102961 to 26.1: Use max_insert_threads for plain INSERTs without materialized views
#103237
Backport #103065 to 26.1: Expose per-thread untracked_memory in system.stack_trace
#103196

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