2025 Changelog

ClickHouse release v25.7.6.21-stable (a81134c5c92) FIXME as compared to v25.7.5.34-stable (a031c88152d)

Improvement

• Backported in #86504: Add ability to enable JSON logging only for specific channel, for this set logger.formatting.channel to one of syslog/console/errorlog/log. #86331 (Azat Khuzhin).

Bug Fix (user-visible misbehavior in an official stable release)

• Backported in #86112: Using distributed_depth as an indicator of *Cluster function was incorrect and may lead to data duplication; use client_info.collaborate_with_initiator instead. #85734 (Konstantin Bogdanov).
• Backported in #86266: Fix logical error on attempt to CREATE ... AS (SELECT * FROM s3Cluster(...)) with DatabaseReplicated. #85904 (Konstantin Bogdanov).
• Backported in #86163: Now unity catalog will ignore schemas with weird data types in case of non-delta tables. Fixes #85699. #85950 (alesapin).
• Backported in #86291: Exception was thrown by a FINAL query with skip index if the table (e.g ReplacingMergeTree) was created with settingindex_granularity_bytes = 0. That exception has been fixed now. #86147 (Shankar Iyer).
• Backported in #86308: Fix crash in case of const and non-const blocks in one INSERT. #86230 (Azat Khuzhin).
• Backported in #86348: Fix crash during ALTER UPDATE Nullable(JSON). #86281 (Pavel Kruglov).
• Backported in #86454: Fixed a bug in Materialized Views: an MV might not work if it was created, dropped, and then created again with the same name. #86413 (Alexander Tokmakov).
• Backported in #86466: Fix leaking of MergesMutationsMemoryTracking due to Buffer tables and fix query_views_log for streaming from Kafka (and others). #86422 (Azat Khuzhin).