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ClickHouseยฎ is a real-time analytics database management system
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Click House v26.5.2.39-stable

Click House: v26.5.2.39-stable Release

Release date:
June 8, 2026
Previous version:
v26.5.1.882-stable (released May 21, 2026)
Magnitude:
125 Diff Delta
Contributors:
2 total committers
Data confidence:
Commits:
40 impacting commits

76 Features Released with v26.5.2.39-stable

Backport #105492 to 26.5: Skip test_numbers_check on release branches
#105601
Fix test_mysql_dotnet_client by anchoring to /testapp
#105636
Fix SIGSEGV when reading Dynamic subcolumns from compressed Memory table after ALTER
#105464
Backport #105636 to 26.5: Fix test_mysql_dotnet_client by anchoring to /testapp
#105661
Fix SEGFAULT in `singleValueOrNull` deserialization for JSON type
#105535
Backport #105449 to 26.5: Fix heap-buffer-overflow and null-pointer dereference in Arrow geo/string column readers
#105622
Do not attribute skip-index-filtered marks to PREWHERE in QueryConditionCache
#105686
Backport #105559 to 26.5: Fix crash in replxx due to hitting FD_SETSIZE limitation of select() (replace with poll())
#105724
Backport #105637 to 26.5: Make `apply_row_policy_after_final` consistent accross versions
#105699
Backport #101757 to 26.5: KeeperDispatcher overhaul
#105770
Backport #105381 to 26.5: Refresh AWS STS credentials mid-query when Glue catalog reads hit ExpiredToken
#105670
Backport #105403 to 26.5: Fix logical error in negative `LIMIT BY`
#105768
Fix data loss on HDFS writes: flush buffer in WriteBufferFromHDFS::finalizeImpl
#103268
Backport #105278 to 26.5: Fix LEFT ANTI JOIN returning left key value in right key column
#105755
Backport #105779 to 26.5: Fix `Keeper` snapshot cleanup after failed writes
#105794
Backport #105686 to 26.5: Do not attribute skip-index-filtered marks to PREWHERE in QueryConditionCache
#105814
Backport #105776 to 26.5: Reject empty or NUL-containing MongoDB collection names
#105838
Fix `IN Array` with negative values for distributed queries
#105894
Backport #105470 to 26.5: Fix segfault in `uniqStateOrNull` with `WITH ROLLUP`/`CUBE`/`TOTALS`
#105876
Backport #105461 to 26.5: Fix dictGetOrDefault with Nullable default expressions under short-circuit evaluation
#105884
Backport #106049 to 26.5: Keeper: start response thread before server startup
#106075
Backport #104416 to 26.5: Hide MySQL and PostgreSQL databases from system.tables by default
#106038
Fix `system.dictionaries` returning 0 rows with partial `SHOW DICTIONARIES` revoke
#106105
Backport #106109 to 26.5: Fix DeltaLake delta-kernel-rs FFI server crash and builder leak
#106159
Backport #105894 to 26.5: Fix `IN Array` with negative values for distributed queries
#106065
Backport #106105 to 26.5: Fix `system.dictionaries` returning 0 rows with partial `SHOW DICTIONARIES` revoke
#106134
Backport #105302 to 26.5: Fix azure init params
#106146
Backport #105851 to 26.5: Keeper: reduce memory during received snapshot apply
#106233
Backport #106220 to 26.5: Apply nuraft fix and add test
#106290
Backport #105584 to 26.5: Honor cast_string_to_date_time_mode for hive partition values
#105731

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