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ClickHouse® is a real-time analytics database management system
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Click House v26.5.1.882-stable

Click House: v26.5.1.882-stable Release

Release date:
May 21, 2026
Previous version:
v26.5.1.1-new (released April 21, 2026)
Magnitude:
4,571 Diff Delta
Contributors:
61 total committers
Data confidence:
Commits:
553 impacting commits

566 Features Released with v26.5.1.882-stable

Docs: clarify description of `parallel_distributed_insert_select`
#104607
Fix data race in FutureSetFromTuple
#104673
Fix TSan data race in ContextData copy constructor on table_function_results
#104879
Add test for #70356
#104551
Reject `ATTACH TABLE` with storage clauses but no `ENGINE`
#104800
Fix ClickBench job: allow `/dev/shm/clickhouse/` as filesystem cache path
#105088
Trim LARGE_FILE_WHITELIST in style check
#105060
More security validations for biglake catalog
#105117
Honor output_format_values_escape_quote_with_quote in Enum/JSON/AggregateFunction/CustomSimpleText serializations
#105285
`decrefColumnsDescriptionForColumns` never evicts cache entries for tables with Nested columns due to wrong `use_count` threshold
#102926
Quote shell arguments in clickhouse install and git-import
#105232
Guard against empty projection crash in PlannerJoinTree
#101005
Fix `assertTypeEquality` to check both sides for wrapper column types
#101105
Ensure query_log entry is written even if pipeline finalization fails
#102165
Logical error: Sort order of blocks violated for column with floating-points
#88138
Fix backward compatibility break in sendProgress for INSERT queries
#103148
Fix `SYSTEM INSTRUMENT REMOVE` without arguments causing `std::bad_optional_access`
#103622
Forbid Tuple element name `null` to prevent subcolumn ambiguity
#98377
Isolate test_dictionaries_all_layouts_separate_sources dictionary configs per worker
#103837
Fix wrong results in numbers() and generate_series() with relaxed IN/NOT IN
#103835
Allowlist `Tuple element name 'null' is reserved` in upgrade check
#103917
`getFileNameForRenamedColumnStream` uses `substr(0, N)` instead of `substr(N)`, corrupting `columns_substreams.txt` after `RENAME COLUMN`
#102259
Replace PREWHERE in timeSeriesSelector
#104044
Reject NaN/Inf and zero-magnitude vectors in vector similarity index
#104079
Guard private-only includes with #if CLICKHOUSE_CLOUD (small files)
#104248
Optimize arrayElement and friends through trivial ALIAS columns
#104245
fix(parser): parse values subscript as identifier
#104312
Update version_date.tsv and changelog after v26.3.10.60-lts
#104375
Fix inconsistent formatting by remembering if an expression was parenthesized
#92340
toUUIDOrZero does not recognise invalid UUID
#86714

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Top Contributors in v26.5.1.882-stable

alexey-milovidov
Algunenano
Blargian
robot-clickhouse
leshikus
groeneai
zoomxi
vvo
Vdimir
niyue

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