Security Fixes
* CVE-2015-0241 Buffer overruns in "to_char" functions.
* CVE-2015-0242 Buffer overrun in replacement printf family of functions.
* CVE-2015-0243 Memory errors in functions in the pgcrypto extension.
* CVE-2015-0244 An error in extended protocol message reading.
* CVE-2014-8161 Constraint violation errors can cause display of values in columns which the user would not normally have rights to see.
JSON and JSONB Unicode Escapes
Other Fixes and Improvements
* Cope with the non-ASCII Norwegian Windows locale name.
* Avoid data corruption when databases are moved to new tablespaces and back again.
* Ensure that UNLOGGED tables are correctly copied during ALTER DATABASE operations.
* Avoid deadlocks when locking recently modified rows.
* Fix two SELECT FOR UPDATE query issues.
* Prevent false negative for shortest-first regular expression matches.
* Fix false positives and negatives in tsquery contains operator.
* Fix namespace handling in xpath().
* Prevent row-producing functions from creating empty column names.
* Make autovacuum use per-table cost_limit and cost_delay settings.
* When autovacuum=off, limit autovacuum work to wraparound prevention only.
* Multiple fixes for logical decoding in 9.4.
* Fix transient errors on hot standby queries due to page replacement.
* Prevent duplicate WAL file archiving at end of recovery or standby promotion.
* Prevent deadlock in parallel restore of schema-only dump.
This update fixes CVE-2014-0060, in which PostgreSQL did not properly enforce the WITH ADMIN OPTION permission for ROLE management.
This update also fixes some issues which affect binary replication and row locking, and can cause recoverable data corruption in some cases.
In addition to the above, the following issues are fixed in this release:
Fix WAL logging of visibility map change
Make sure that GIN indexes log all insertions
Get pause_at_recovery_target to pause at correct time
Ensure walreceiver sends hot-standby feedback messages on time
Prevent timeout interrupts from taking control away from mainline code
Eliminate several race conditions
Fix some broken HINTs in error messages
Prevent server lockup on SSL connection loss
Fix two Unicode handling issues
Prevent crash on certain subselect syntax
Prevent crash on select from zero column table
Fix two bugs with LATERAL
Fix issue with UNION ALL, partitioning, and updates
Ensure that ANALYZE understands domains over ranges
Eliminate permissions check when using default tablespace
Fix memory leakage in JSON functions
Allow extensions with event triggers
Distinguish numbers correctly in JSON output
Fix permissions for pg_start_backup() and pg_stop_backup()
Accept SHIFT_JIS as locale name
Fix .* expansion for SQL function variables
Prevent infinite loop on some COPY connection failures
Several fixes for client issues on Windows
Enable building PostgreSQL with Visual Studio 2013
Update time zone files for recent changes
* Add materialized views
* Make simple views auto-updatable
* Add many features for the JSON data type, including operators and functions to extract elements from JSON values
* Implement SQL-standard LATERAL option for FROM-clause subqueries and function calls
* Allow foreign data wrappers to support writes (inserts/updates/deletes) on foreign tables
* Add a Postgres foreign data wrapper to allow access to other Postgres servers
* Add support for event triggers
* Add optional ability to checksum data pages and report corruption
* Prevent non-key-field row updates from blocking foreign key checks
* Greatly reduce System V shared memory requirements
