First draft of PG11 release notes

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+# PostgreSQL 11 Released
+
+DD MONTH 2018 - The PostgreSQL Global Development Group today announced the
+release of PostgreSQL 11, the latest version of the world's most advanced open
+source database.
+
+PostgreSQL 11 builds on previous releases by further improving the overall
+performance of the database system and adds more features for working with very
+large databases with high computational workloads. This release makes
+significant improvements to the table partitioning system, adds support for
+stored procedures capable of transaction management, improves query parallelism
+and adds parallelized data definition capabilities, and introduces just-in-time
+(JIT) compilation for accelerating the execution of expressions in queries.
+
+##### HOLD FOR QUOTE FROM CORE TEAM MEMBER ABOUT RELEASE
+
+PostgreSQL was open sourced over two decades ago and has become the preferred
+open source relational database for developers. The project continues to receive
+recognition across the industry, and has been featured as the
+"DBMS of the Year 2017" by DB-Engines and in the SD Times 2018 100.
+
+This is the first major release since PostgreSQL 10 was released on October 5,
+2017. The PostgreSQL Global Development Group changed the release versioning
+scheme for PostgreSQL 10. The next release for PostgreSQL 11 containing bug
+fixes will be PostgreSQL 11.1, and the next major release with new features will
+be PostgreSQL 12.
+
+## Increased Robustness and Performance for Partitioning
+
+PostgreSQL 11 adds the ability to partition data by a hash key, also known as
+hash partitioning, adding to the current ability to partition data in PostgreSQL
+by a list of values or by a range. PostgreSQL 11 also supports partitioned
+tables that utilize the PostgreSQL foreign data wrapper,
+[postgres_fdw](https://www.postgresql.org/docs/current/static/postgres-fdw.html),
+enabling users to combine partitioning with data federation techniques.
+
+To help with managing partitions, PostgreSQL 11 introduces a catch-all default
+partition for data that does not match a partition key, and the ability to
+create primary keys, foreign keys, indexes, and triggers on partitions that are
+passed down to all tables. PostgreSQL 11 also supports automatically moving rows
+to the correct partition if the partition key for that row is updated
+.
+##### HOLD FOR QUOTE ABOUT PARTITIONING
+
+PostgreSQL 11 improves upon query performance when reading from partitions by
+using a new partition elimination strategy. Additionally, PostgreSQL 11 now
+supports the popular "upsert" feature on partitioned tables, which helps users
+to simplify application code and reduce network overhead when interacting with
+their data.
+
+## Transactions Supported in Stored Procedures
+
+Developers have been able to create user-defined functions in PostgreSQL for
+over 20 years, but prior to PostgreSQL 11, these functions were unable to manage
+their own transactions. PostgreSQL 11 adds SQL procedures that can perform full
+transaction management within the body of a function, enabling developers to
+create more advanced server-side applications, such as ones involving
+incremental bulk data loading.
+
+SQL procedures can be created using the `CREATE PROCEDURE` command, executed
+using the `CALL` command, and are supported in the server-side procedural
+languages PL/pgSQL, PL/Perl, PL/Python, PL/Tcl, and the Server Programming
+Interface (SPI) languages.
+
+[HOLD FOR QUOTE ABOUT SQL STORED PROCEDURES]
+
+## Enhanced Capabilities for Query Parallelism
+
+PostgreSQL 11 improves parallel query performance, with performance gains in
+parallel sequential scans and hash joins along with more efficient scans of
+partitioned data. PostgreSQL can now execute SELECT queries that use `UNION` in
+parallel if the underlying queries are unable to be parallelized.
+
+PostgreSQL 11 adds parallelism to several data definition commands, notably for
+the creation of B-tree indexes that are generated by executing the standard
+`CREATE INDEX` command. Several data definition commands that either create
+tables or materialized views from queries are also parallel capable now,
+including the `CREATE TABLE .. AS`, `SELECT INTO`, and `CREATE MATERIALIZED VIEW`.
+
+[HOLD FOR QUOTE ABOUT PARALLELISM]
+
+## Just-in-Time (JIT) Compilation for Expressions
+
+PostgreSQL 11 introduces support for Just-In-Time (JIT) compilation to
+accelerate the execution of certain expressions during query execution. JIT
+expression compilation for PostgreSQL uses the LLVM project to speed up the
+execution of expressions in WHERE clauses, target lists, aggregates,
+projections, and some internal operations.
+
+[HOLD FOR QUOTE ABOUT JIT]
+
+To take advantage of JIT compilation, you will need to install the LLVM
+dependencies enable JIT compilation in either your PostgreSQL settings file by
+setting `jit = on` or from your PostgreSQL session by executing `SET jit = on`.
+
+## General User Experience Improvements
+
+The enhancements to the PostgreSQL relational database are not possible without
+the feedback from an active user community and the hard work by the people who
+work on PostgreSQL. Below highlights a few of the many features included in
+PostgreSQL 11 designed to improve the overall user experience:
+
+- Removing the need for `ALTER TABLE .. ADD COLUMN .. DEFAULT ..` with a not
+`NULL` default to rewrite the whole table on execution, which provides a
+significant performance boost when running this command.
+- "Covering indexes," which allows a user to add additional columns to an index
+using the `INCLUDE` clause and are helpful for performing index-only scans,
+especially on data types that are not indexable by B-tree indexes.
+- Additional functionally for working with window functions, including allowing
+`RANGE` to use `PRECEDING`/`FOLLOWING`, `GROUPS`, and frame exclusion
+- The inclusion of the keywords "quit" and "exit" in the PostgreSQL command-line
+interface to help make it easier to leave the command-line tool
+
+For a full list of features included in this release, please read the
+[release notes](https://www.postgresql.org/docs/11/static/release-11.html),
+which can be found at:
+
+[https://www.postgresql.org/docs/11/static/release-11.html](https://www.postgresql.org/docs/11/static/release-11.html)
+
+## About PostgreSQL
+
+PostgreSQL is the world's most advanced open source database, with a global
+community of thousands of users, contributors, companies and organizations. The
+PostgreSQL Project builds on over 30 years of engineering, starting at the
+University of California, Berkeley, and has continued with an unmatched pace of
+development. PostgreSQL's mature feature set not only matches top proprietary
+database systems, but exceeds them in advanced database features, extensibility,
+security and stability. Learn more about PostgreSQL and participate in our
+community at [PostgreSQL.org](https://www.postgresql.org).