PostgreSQL 15 beta 4 release announcement first draft

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+The PostgreSQL Global Development Group announces that the fourth beta release of
+PostgreSQL 15 is now [available for download](https://www.postgresql.org/download/).
+This release contains previews of all features that will be available when
+PostgreSQL 15 is made generally available, though some details of the release
+can change during the beta period.
+
+You can find information about all of the PostgreSQL 15 features and changes in
+the [release notes](https://www.postgresql.org/docs/15/release-15.html):
+
+  [https://www.postgresql.org/docs/15/release-15.html](https://www.postgresql.org/docs/15/release-15.html)
+
+In the spirit of the open source PostgreSQL community, we strongly encourage you
+to test the new features of PostgreSQL 15 on your systems to help us eliminate
+bugs or other issues that may exist. While we do not advise you to run
+PostgreSQL 15 Beta 4 in production environments, we encourage you to find ways
+to run your typical application workloads against this beta release.
+
+Your testing and feedback will help the community ensure that PostgreSQL 15
+upholds our standards of delivering a stable, reliable release of the world's
+most advanced open source relational database. Please read more about our
+[beta testing process](https://www.postgresql.org/developer/beta/) and how you
+can contribute:
+
+  [https://www.postgresql.org/developer/beta/](https://www.postgresql.org/developer/beta/)
+
+Upgrading to PostgreSQL 15 Beta 4
+---------------------------------
+
+To upgrade to PostgreSQL 15 Beta 4 from an earlier beta or previous version of
+PostgreSQL, you will need to use a strategy similar to upgrading between major
+versions of PostgreSQL (e.g. `pg_upgrade` or `pg_dump` / `pg_restore`). For more
+information, please visit the documentation section on
+[upgrading](https://www.postgresql.org/docs/15/static/upgrading.html).
+
+Changes Since Beta 3
+--------------------
+
+Fixes and changes in PostgreSQL 15 Beta 3 include:
+
+* The SQL/JSON features proposed for this release have been removed.
+* [`MERGE`](https://www.postgresql.org/docs/15/sql-merge.html) statements are
+explicitly rejected inside of a
+[common-table expression](https://www.postgresql.org/docs/15/queries-with.html)
+(aka `WITH` query) and
+[`COPY`](https://www.postgresql.org/docs/15/sql-copy.html) statements.
+* Enable `table_rewrite` event triggers for `ALTER MATERIALIZED VIEW`.
+* Fix crash in `CREATE DATABASE ... STRATEGY WAL_LOG`.
+* Fix crash with parallel vacuum.
+* Fix issue with
+[recovery prefeteching](https://www.postgresql.org/docs/15/runtime-config-wal.html#GUC-RECOVERY-PREFETCH)
+that could cause a crash on standby promotion.
+* Adjust costing to force parallelism with partition aggregates.
+* Fix LSN returned for error reports of WAL read failures from the
+[`pg_walinspect`](https://www.postgresql.org/docs/15/pgwalinspect.html) extension.
+
+Please see the [release notes](https://www.postgresql.org/docs/15/release-15.html)
+for a complete list of new and changed features:
+
+  [https://www.postgresql.org/docs/15/release-15.html](https://www.postgresql.org/docs/15/release-15.html)
+
+Testing for Bugs & Compatibility
+--------------------------------
+
+The stability of each PostgreSQL release greatly depends on you, the community,
+to test the upcoming version with your workloads and testing tools to find bugs
+and regressions before the general availability of PostgreSQL 15. As
+this is a beta release, changes to database behaviors, feature details, and
+APIs are still possible. Your feedback and testing will help determine the final
+tweaks on the new features, so please test in the near future. The quality of
+user testing helps determine when we can make a final release.
+
+A list of [open issues](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items)
+is publicly available in the PostgreSQL wiki.  You can
+[report bugs](https://www.postgresql.org/account/submitbug/) using this form on
+the PostgreSQL website:
+
+  [https://www.postgresql.org/account/submitbug/](https://www.postgresql.org/account/submitbug/)
+
+Beta Schedule
+-------------
+
+This is the fourth beta release of version 15. The PostgreSQL Project will
+release additional betas as required for testing, followed by one or more
+release candidates, until the final release in late 2022. For further
+information please see the [Beta Testing](https://www.postgresql.org/developer/beta/) page.
+
+Links
+-----
+
+* [Download](https://www.postgresql.org/download/)
+* [Beta Testing Information](https://www.postgresql.org/developer/beta/)
+* [PostgreSQL 15 Beta Release Notes](https://www.postgresql.org/docs/15/release-15.html)
+* [PostgreSQL 15 Open Issues](https://wiki.postgresql.org/wiki/PostgreSQL_15_Open_Items)
+* [Submit a Bug](https://www.postgresql.org/account/submitbug/)
+* [Follow @postgresql on Twitter](https://twitter.com/postgresql)