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ClickHouseยฎ is a real-time analytics database management system
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Click House v26.8.1.2041-lts

Click House: v26.8.1.2041-lts Release

Release date:
September 13, 2026
Previous version:
v26.8.1.1-new (released July 22, 2026)
Magnitude:
2,367 Diff Delta
Contributors:
50 total committers
Data confidence:
Commits:
1,164 impacting commits

38 Features Released with v26.8.1.2041-lts

Respect use_client_time_zone for string datetime literals parsed on the server
#109051
Add the `default_session_user` server setting
#110179
Mask session_token and Google ADC secrets in the explicit-url S3 form
#109768
Configurable per-CPU jemalloc arena pool for MergeTree metadata
#109490
Mutations via `MutateAllPartColumnsTask` write `checksums.txt` without hardlinked skip-index files
#109595
Identifier resolution error in select when table has same name as database
#82084
Remove `library` dictionary source
#106190
Resolve JOIN USING identifier from aliases nested in the SELECT list
#110739
Cannot aggregate a `Variant` produced by `if`/`coalesce`/`multiIf` over mixed types
#106707
`getRequiredAccessForDDLOnCluster` uses the `SYSTEM DROP CACHE` privilege GROUP for the whole cache block, so an `ON CLUSTER` cache command demands all ~29 leaf privileges and `SYSTEM SYNC FILESYSTEM CACHE ON CLUSTER` never checks its own privilege
#114011
connection_pool_max_wait_ms default is 0, (non negative), but Common/PoolBase.h check expect it to be <0
#112053
Add a new "private preview" feature tier
#113481
Query planner stuck for hours in bloom_filter index analysis when WHERE references a large scalar subquery Map, query cannot be killed
#113003
Fix possible logical error "Unexpected substream ... for column ..." during bump of compatibility setting
#109496
Stateless tests (amd_msan, WasmEdge, parallel, N/2) no longer fit the 9000s job budget: killed mid-suite with no failing test
#113164
JOIN on parameterized view fails with UNKNOWN_IDENTIFIER
#65318
Segfault (write) in `Parquet::Dictionary::index` with dictionary-encoded DECIMAL column โ€” physical width wider than destination (native reader v3, 26.7.1)
#112659
Iceberg OPTIMIZE rejects position-delete overwrite snapshots when deleted row count != delete file count
#113745
CI: `SYSTEM FLUSH LOGS query_log` hangs for 180 s in `Stateless tests (amd_tsan, flaky check)` across unrelated pull requests since 2026-07-24
#112191
Materialized CTE over Distributed: 49 LOGICAL_ERROR "Reading from materialized CTE before its materialization completed - DelayedPortsProcessor gate is missing" survives the #108924 fix
#113184
Heap-use-after-free: Parquet v3 prefetcher reads and writes through a `ReadBuffer` freed by `IInputFormat::onFinish`
#114612
geoToH3 error messages reference swapped argument positions in default lat_lon mode
#101813
Revert "Add test: Streaming-subscription ALTER guard untested; PR adds `MODIFY_PROJECTION` to it"
#115934
I can create a table so that later ALTER TABLE ... DROP COLUMN gives syntax error
#109370
Fix `Context has expired` logical error in `getClientHTTPHeader`
#112533
Fix column not found error for lazy materialization and part_offset iโ€ฆ
#108287
set missing coordination component in system.detached_parts size calculation
#109553
Text index makes has(col, '') / mapContainsKey(m, '') / mapContainsValue(m, '') match all rows โ€” empty needle is vacuously true
#110092
Bug: NOT_FOUND_COLUMN_IN_BLOCK with LEFT JOIN + AND 1
#111452
part_minmax_index_columns table NOT_FOUND_COLUMN_IN_BLOCK during ALTER UPDATE
#106780

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Top Contributors in v26.8.1.2041-lts

alexey-milovidov
groeneai
Algunenano
PedroTadim
thevar1able
azat
nihalzp
CheSema
vitlibar
rienath

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