Addition of release notes

Signed-off-by: Andres Taylor <[email protected]>

changelog/18.0/18.0.3/changelog.md

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+# Changelog of Vitess v18.0.3
+
+### Bug fixes 
+#### CLI
+ * [release-18.0] Fix some binaries to print the versions (#15306) [#15309](https://github.com/vitessio/vitess/pull/15309) 
+#### Evalengine
+ * [release-18.0] evalengine: Fix week overflow (#14859) [#14861](https://github.com/vitessio/vitess/pull/14861)
+ * [release-18.0] evalengine: Return evalTemporal types for current date / time (#15079) [#15084](https://github.com/vitessio/vitess/pull/15084) 
+#### General
+ * [release-18.0] Protect `ExecuteFetchAsDBA` against multi-statements, excluding a sequence of `CREATE TABLE|VIEW`. (#14954) [#14984](https://github.com/vitessio/vitess/pull/14984) 
+#### Online DDL
+ * [release-18.0] VReplication/OnlineDDL: reordering enum values (#15103) [#15351](https://github.com/vitessio/vitess/pull/15351) 
+#### Query Serving
+ * [release-18]: Vindexes: Pass context in consistent lookup handleDup (#14653) [#14911](https://github.com/vitessio/vitess/pull/14911)
+ * [release-18.0] evalengine bugfix: handle nil evals correctly when coercing values (#14906) [#14914](https://github.com/vitessio/vitess/pull/14914)
+ * [release-18.0] bugfix: Columns alias expanding (#14935) [#14955](https://github.com/vitessio/vitess/pull/14955)
+ * [release-18.0] Improve efficiency and accuracy of mysqld.GetVersionString (#15096) [#15111](https://github.com/vitessio/vitess/pull/15111)
+ * [release-18.0] In the same sqltypes.Type, Copy expression types to avoid weight_strings and derived tables (#15069) [#15129](https://github.com/vitessio/vitess/pull/15129)
+ * [release-18.0] make sure to handle unsupported collations well (#15134) [#15142](https://github.com/vitessio/vitess/pull/15142)
+ * [release-18.0] fix: ignore internal tables in schema tracking (#15141) [#15146](https://github.com/vitessio/vitess/pull/15146)
+ * [release-18.0] TxThrottler: dont throttle unless lag (#14789) [#15190](https://github.com/vitessio/vitess/pull/15190)
+ * [release-18.0] Avoid rewriting unsharded queries and split semantic analysis in two (#15217) [#15229](https://github.com/vitessio/vitess/pull/15229)
+ * [release-18.0] sqlparser: use integers instead of literals for Length/Precision  (#15256) [#15268](https://github.com/vitessio/vitess/pull/15268)
+ * [release-18.0] Fix Go routine leaks in streaming calls (#15293) [#15300](https://github.com/vitessio/vitess/pull/15300)
+ * [release-18.0] Column alias expanding on ORDER BY  (#15302) [#15331](https://github.com/vitessio/vitess/pull/15331)
+ * [release-18.0] go/vt/discovery: use protobuf getters for SrvVschema (#15343) [#15345](https://github.com/vitessio/vitess/pull/15345)
+ * [release-18.0] SHOW VITESS_REPLICATION_STATUS: Only use replication tracker when it's enabled (#15348) [#15361](https://github.com/vitessio/vitess/pull/15361)
+ * [release-18.0] Bugfix: GROUP BY/HAVING alias resolution (#15344) [#15381](https://github.com/vitessio/vitess/pull/15381) 
+#### Schema Tracker
+ * [release-18.0] discovery: fix crash with nil server vschema (#15086) [#15092](https://github.com/vitessio/vitess/pull/15092) 
+#### Throttler
+ * [release-18.0] examples: rm heartbeat flags (#14980) [#14999](https://github.com/vitessio/vitess/pull/14999) 
+#### VReplication
+ * [release-18.0] VReplication: Make Target Sequence Initialization More Robust (#15289) [#15307](https://github.com/vitessio/vitess/pull/15307)
+ * [release-18.0] VtctldClient Reshard: add e2e tests to confirm CLI options and fix discovered issues. (#15353) [#15471](https://github.com/vitessio/vitess/pull/15471) 
+#### VTCombo
+ * [release-18.0] Correctly set log_dir default in vtcombo (#15153) [#15154](https://github.com/vitessio/vitess/pull/15154) 
+#### vtexplain
+ * [release-18.0] vtexplain: Fix setting up the column information (#15275) [#15281](https://github.com/vitessio/vitess/pull/15281)
+ * [release-18.0] vtexplain: Ensure memory topo is set up for throttler (#15279) [#15284](https://github.com/vitessio/vitess/pull/15284) 
+#### vttestserver
+ * [release-18.0] Revert unwanted logging change to `vttestserver` (#15148) [#15149](https://github.com/vitessio/vitess/pull/15149)
+ * [release-18.0] use proper mysql version in the `vttestserver` images (#15235) [#15238](https://github.com/vitessio/vitess/pull/15238)
+### CI/Build 
+#### Build/CI
+ * [release-18.0] Fix relevant files listing for `endtoend` CI (#15104) [#15110](https://github.com/vitessio/vitess/pull/15110)
+ * [release-18.0] Remove concurrency group for check labels workflow (#15197) [#15208](https://github.com/vitessio/vitess/pull/15208)
+ * [release-18.0] bump `github.com/golang/protobuf` to `v1.5.4` (#15426) [#15427](https://github.com/vitessio/vitess/pull/15427)
+ * [release-18.0] Update all actions setup to latest versions (#15443) [#15445](https://github.com/vitessio/vitess/pull/15445) 
+#### General
+ * [release-18.0] Upgrade the Golang version to `go1.21.8` [#15407](https://github.com/vitessio/vitess/pull/15407)
+### Dependabot 
+#### Java
+ * [release-18.0] build(deps): bump io.netty:netty-handler from 4.1.93.Final to 4.1.94.Final in /java (#14863) [#14881](https://github.com/vitessio/vitess/pull/14881)
+### Documentation 
+#### Documentation
+ * [release-18.0] 18.0.3 release notes: ExecuteFetchAsDBA breaking change [#15013](https://github.com/vitessio/vitess/pull/15013)
+ * [release-18.0] Fix docs for unmanaged tablets (#15437) [#15473](https://github.com/vitessio/vitess/pull/15473)
+### Enhancement 
+#### Build/CI
+ * [release-18.0] Update paths filter action (#15254) [#15263](https://github.com/vitessio/vitess/pull/15263)
+### Performance 
+#### Throttler
+ * [release-18.0] Throttler: Use tmclient pool for CheckThrottler tabletmanager RPC [#15087](https://github.com/vitessio/vitess/pull/15087)
+### Regression 
+#### Query Serving
+ * [release-18.0] Subquery inside aggregration function (#14844) [#14845](https://github.com/vitessio/vitess/pull/14845)
+ * [release-18.0] Fix routing rule query rewrite (#15253) [#15258](https://github.com/vitessio/vitess/pull/15258) 
+#### Throttler
+ * [release-18.0] Enable 'heartbeat_on_demand_duration' in local/examples (#15204) [#15291](https://github.com/vitessio/vitess/pull/15291) 
+#### vttestserver
+ * [release-18.0] Fix logging issue when running in Docker with the syslog daemon disabled (#15176) [#15185](https://github.com/vitessio/vitess/pull/15185)
+### Release 
+#### General
+ * Back to dev mode after v18.0.2 [#14839](https://github.com/vitessio/vitess/pull/14839)
+ * [release-18.0] Code Freeze for `v18.0.3` [#15480](https://github.com/vitessio/vitess/pull/15480)
+### Testing 
+#### Build/CI
+ * [release-18.0] Use `go1.22.0` in upgrade tests [#15170](https://github.com/vitessio/vitess/pull/15170)
+ * [release-18.0] CI: Address data races on memorytopo Conn.closed (#15365) [#15370](https://github.com/vitessio/vitess/pull/15370)
+

changelog/18.0/18.0.3/release_notes.md

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+# Release of Vitess v18.0.3
+## Summary
+
+### Table of Contents
+
+- **[Major Changes](#major-changes)**
+  - **[Breaking Changes](#breaking-changes)**
+    - [ExecuteFetchAsDBA rejects multi-statement SQL](#execute-fetch-as-dba-reject-multi)
+
+## <a id="major-changes"/>Major Changes
+
+### <a id="breaking-changes"/>Breaking Changes
+
+#### <a id="execute-fetch-as-dba-reject-multi"/>ExecuteFetchAsDBA rejects multi-statement SQL
+
+`vtctldclient ExecuteFetchAsDBA` (and similarly the `vtctl` and `vtctlclient` commands) now reject multi-statement SQL with error.
+
+For example, `vtctldclient ExecuteFetchAsDBA my-tablet "stop replica; change replication source to auto_position=1; start replica` will return an error, without attempting to execute any of these queries.
+
+Previously, `ExecuteFetchAsDBA` silently accepted multi statement SQL. It would (attempt to) execute all of them, but:
+
+- It would only indicate error for the first statement. Errors on 2nd, 3rd, ... statements were silently ignored.
+- It would not consume the result sets of the 2nd, 3rd, ... statements. It would then return the used connection to the pool in a dirty state. Any further query that happens to take that connection out of the pool could get unexpected results.
+- As another side effect, multi-statement schema changes would cause schema to be reloaded with only the first change, leaving the cached schema inconsistent with the underlying database.
+
+`ExecuteFetchAsDBA` does allow a specific use case of multi-statement SQL, which is where all statements are in the form of `CREATE TABLE` or `CREATE VIEW`. This is to support a common pattern of schema initialization, formalized in `ApplySchema --batch-size` which uses `ExecuteFetchAsDBA` under the hood.
+
+------------
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/18.0/18.0.3/changelog.md).
+
+The release includes 47 merged Pull Requests.
+
+Thanks to all our contributors: @app/github-actions, @app/vitess-bot, @frouioui, @harshit-gangal, @rohit-nayak-ps, @shlomi-noach, @systay, @wangweicugw
+

changelog/18.0/README.md

@@ -1,5 +1,7 @@
 ## v18.0
 * **[18.0.3](18.0.3)**
+	* [Changelog](18.0.3/changelog.md)
+	* [Release Notes](18.0.3/release_notes.md)
 
 * **[18.0.2](18.0.2)**
 	* [Changelog](18.0.2/changelog.md)