Release Notes for v25.3-v25.3.6

src/current/_data/releases.yml

@@ -10179,3 +10179,38 @@
       CockroachDB Cloud clusters. To request to upgrade
       a CockroachDB self-hosted cluster to this version,
       [contact support](https://support.cockroachlabs.com/hc/requests/new).
+
+
+- release_name: v25.3.6
+  major_version: v25.3
+  release_date: '2025-12-12'
+  release_type: Production
+  go_version: go1.25.3
+  sha: 7bad8e82ef2989b3cd657baca02567a892c1b5c3
+  has_sql_only: true
+  has_sha256sum: true
+  mac:
+    mac_arm: true
+    mac_arm_experimental: true
+    mac_arm_limited_access: false
+  windows: true
+  linux:
+    linux_arm: true
+    linux_arm_experimental: false
+    linux_arm_limited_access: false
+    linux_intel_fips: true
+    linux_arm_fips: false
+  docker:
+    docker_image: cockroachdb/cockroach
+    docker_arm: true
+    docker_arm_experimental: false
+    docker_arm_limited_access: false
+  source: true
+  previous_release: v25.3.6
+  cloud_only: true
+  cloud_only_message_short: 'Available only for select CockroachDB Cloud clusters'
+  cloud_only_message: >
+      This version is currently available only for select
+      CockroachDB Cloud clusters. To request to upgrade
+      a CockroachDB self-hosted cluster to this version,
+      [contact support](https://support.cockroachlabs.com/hc/requests/new).

src/current/_includes/releases/v25.3/v25.3.6.md

@@ -4,32 +4,30 @@ Release Date: December 12, 2025
 
 {% include releases/new-release-downloads-docker-image.md release=include.release %}
 
-<h3 id="v25-3-6-bug-fixes">Bug fixes</h3>
-
-- A mechanism that prevents unsafe replication changes from causing loss of quorum now functions correctly. An internal function has been fixed to properly return errors, enhancing the reliability of replication safeguards. [#156522][#156522]
-- Fixed a bug where the "atomic" `COPY` command (controlled via the `copy_from_atomic_enabled` session setting, `true` by default) could encounter `RETRY_COMMIT_DEADLINE_EXCEEDED` transaction errors if the whole command took 1 minute or more. This bug occurred only when the vectorized engine was used for `COPY`. [#156694][#156694]
-- Attempting to create a vector index with the legacy schema changer will now fail gracefully instead of crashing the node. [#156781][#156781]
-- Fixed a bug that could cause internal errors for queries using generic query plans with `NULL` placeholder values. [#156978][#156978]
-- Fixed a bug where CockroachDB could encounter an internal error when evaluating a `COPY FROM` command in a transaction after it was rolled back to a savepoint. The bug was present since before v23.2. [#157038][#157038]
-- Fixed a bug where CockroachDB could encounter a `vector encoder doesn't support ForcePut yet` error when executing `COPY` commands concurrently with certain schema changes. The bug had existed since before v23.2. [#157199][#157199]
-- Fixed a bug that could cause a schema change to be stuck in the reverting state if the `infer_rbr_region_col_using_constraint` storage parameter was being set at the same time as adding a constraint that had a foreign key violation. [#157843][#157843]
+<h3 id="v25-3-6-sql-language-changes">SQL language changes</h3>
 
-<h3 id="v25-3-6-performance-improvements">Performance improvements</h3>
+- Fixed two cases where creation of a routine
+  resolves unnecessary column dependencies, which can prevent drop of the
+  column without first dropping the routine. Here, the unnecessary
+  dependencies are due to references within CHECK constraints, including
+  those for RLS policies and hash-sharded indexes, as well as those in
+  partial index predicates. The fix is gated behind the session setting
+  `use_improved_routine_deps_triggers_and_computed_cols`, which is off by
+  default before 26.1. [#159470][#159470]
 
-- The cost of generic query plans is now calculated based on worst-case selectivities for placeholder equalities (e.g., `x = $1`). This reduces the chance of suboptimal generic query plans being chosen when `plan_cache_mode=auto`. [#156791][#156791]
-
-<h3 id="v25-3-6-miscellaneous">Miscellaneous</h3>
+<h3 id="v25-3-6-bug-fixes">Bug fixes</h3>
 
-- Span config reconciliation jobs no longer fail on the
-  destination after failover from a PCR stream of a system virtual cluster. [#156811][#156811]
+- Fixed a bug that caused routines to prevent
+  dropping more columns than necessary, most notably columns referenced
+  by computed column expressions. The fix is gated behind the session
+  setting `use_improved_routine_deps_triggers_and_computed_cols`, which
+  is off by default prior to v26.1. [#159470][#159470]
+- Fixed a bug that allowed a column to be dropped from
+  its table despite being referenced by a routine. The bug could happen when the
+  column was only referenced as a target column in the SET clause of an UPDATE
+  statement within the routine. This fix only applies to newly-created routines.
+  In versions prior to v26.1, the fix must be enabled by setting the session
+  variable `prevent_update_set_column_drop`. [#159470][#159470]
 
 
-[#156791]: https://github.com/cockroachdb/cockroach/pull/156791
-[#156781]: https://github.com/cockroachdb/cockroach/pull/156781
-[#156978]: https://github.com/cockroachdb/cockroach/pull/156978
-[#157038]: https://github.com/cockroachdb/cockroach/pull/157038
-[#157843]: https://github.com/cockroachdb/cockroach/pull/157843
-[#156522]: https://github.com/cockroachdb/cockroach/pull/156522
-[#156694]: https://github.com/cockroachdb/cockroach/pull/156694
-[#157199]: https://github.com/cockroachdb/cockroach/pull/157199
-[#156811]: https://github.com/cockroachdb/cockroach/pull/156811
+[#159470]: https://github.com/cockroachdb/cockroach/pull/159470