Updating release notes for 4.3.1.0

Author: foundationdb-ci

docs/sphinx/source/ReleaseNotes.md

@@ -5,6 +5,46 @@ This document contains a log of changes to the FoundationDB Record Layer. It aim
 
 As the [versioning guide](Versioning.md) details, it cannot always be determined solely by looking at the version numbers whether one Record Layer version contains all changes included in another. In particular, bug fixes and backwards-compatible changes might be back-ported to or introduced as patches against older versions. To track when a patch version has been included in the main release train, some releases will say as a note that they contain all changes from a specific patch.
 
+## 4.3
+
+### 4.3.1.0
+
+<h4> New Features </h4>
+
+* New planner rule added to push predicates down in the query representation - [PR #3324](https://github.com/FoundationDB/fdb-record-layer/pull/3324)
+* Create FutureManagerRunner and convert FDBDatabaseRunnerImpl to use it. - [PR #3347](https://github.com/FoundationDB/fdb-record-layer/pull/3347)
+* Implement Compilable SQL functions - [PR #3307](https://github.com/FoundationDB/fdb-record-layer/pull/3307)
+* Add RecordCountKey State - [PR #3334](https://github.com/FoundationDB/fdb-record-layer/pull/3334)
+* multi phase planning - [PR #3328](https://github.com/FoundationDB/fdb-record-layer/pull/3328)
+<h4> Bug Fixes </h4>
+
+* add minimize to RecordQueryPlan - [PR #3356](https://github.com/FoundationDB/fdb-record-layer/pull/3356)
+
+<details>
+<summary>
+
+<h4> Build/Test/Documentation/Style Improvements (click to expand) </h4>
+
+</summary>
+
+* ParameterizedTest utilities - [PR #3336](https://github.com/FoundationDB/fdb-record-layer/pull/3336)
+* Remove 4.2.7.0 release notes as build was never published - [PR #3345](https://github.com/FoundationDB/fdb-record-layer/pull/3345)
+
+</details>
+
+
+**[Full Changelog (4.2.8.0...4.3.1.0)](https://github.com/FoundationDB/fdb-record-layer/compare/4.2.8.0...4.3.1.0)**
+
+#### Mixed Mode Test Results
+
+Mixed mode testing run against the following previous versions:
+
+❌`4.1.8.0`, ✅`4.1.9.0`, ✅`4.1.10.0`, ✅`4.2.2.0`, ✅`4.2.2.1`, ❌`4.2.3.0`, ❌`4.2.4.0`, ✅`4.2.5.0`, ✅`4.2.6.0`, ✅`4.2.8.0`
+
+[See full test run](https://github.com/FoundationDB/fdb-record-layer/actions/runs/15223203009)
+
+
+
 ## 4.2
 
 ### 4.2.8.0