E.40. Release 9.2.5

E.40.1. Migration to Version 9.2.5

A dump/restore is not required for those running 9.2.X.

However, if you are upgrading from a version earlier than 9.2.4, see Section E.41.

E.40.2. Changes

• Prevent corruption of multi-byte characters when attempting to case-fold identifiers (Andrew Dunstan)

  PostgreSQL case-folds non-ASCII characters only when using a single-byte server encoding.

• Fix memory leak when creating B-tree indexes on range columns (Heikki Linnakangas)

• Fix checkpoint memory leak in background writer when wal_level = hot_standby (Naoya Anzai)

• Fix memory leak caused by lo_open() failure (Heikki Linnakangas)

• Fix memory overcommit bug when work_mem is using more than 24GB of memory (Stephen Frost)

• Serializable snapshot fixes (Kevin Grittner, Heikki Linnakangas)

• Fix deadlock bug in libpq when using SSL (Stephen Frost)

• Fix possible SSL state corruption in threaded libpq applications (Nick Phillips, Stephen Frost)

• Improve estimate of planner cost when choosing between generic and custom plans (Tom Lane)

  This change will favor generic plans when planning cost is high.

• Properly compute row estimates for boolean columns containing many NULL values (Andrew Gierth)

  Previously tests like col IS NOT TRUE and col IS NOT FALSE did not properly factor in NULL values when estimating plan costs.

• Fix accounting for qualifier evaluation costs in UNION ALL and inheritance queries (Tom Lane)

  This fixes cases where suboptimal query plans could be chosen if some WHERE clauses are expensive to calculate.

• Prevent pushing down WHERE clauses into unsafe UNION/INTERSECT subqueries (Tom Lane)

  Subqueries of a UNION or INTERSECT that contain set-returning functions or volatile functions in their SELECT lists could be improperly optimized, leading to run-time errors or incorrect query results.

• Fix rare case of "failed to locate grouping columns" planner failure (Tom Lane)

• Fix pg_dump of foreign tables with dropped columns (Andrew Dunstan)

  Previously such cases could cause a pg_upgrade error.

• Reorder pg_dump processing of extension-related rules and event triggers (Joe Conway)

• Force dumping of extension tables if specified by pg_dump -t or -n (Joe Conway)

• Improve view dumping code's handling of dropped columns in referenced tables (Tom Lane)

• Fix pg_restore -l with the directory archive to display the correct format name (Fujii Masao)

• Properly record index comments created using UNIQUE and PRIMARY KEY syntax (Andres Freund)

  This fixes a parallel pg_restore failure.

• Cause pg_basebackup -x with an empty xlog directory to throw an error rather than crashing (Magnus Hagander, Haruka Takatsuka)

• Properly guarantee transmission of WAL files before clean switchover (Fujii Masao)

  Previously, the streaming replication connection might close before all WAL files had been replayed on the standby.

• Fix WAL segment timeline handling during recovery (Mitsumasa Kondo, Heikki Linnakangas)

  WAL file recycling during standby recovery could lead to premature recovery completion, resulting in data loss.

• Prevent errors in WAL replay due to references to uninitialized empty pages (Andres Freund)

• Fix REINDEX TABLE and REINDEX DATABASE to properly revalidate constraints and mark invalidated indexes as valid (Noah Misch)

  REINDEX INDEX has always worked properly.

• Avoid deadlocks during insertion into SP-GiST indexes (Teodor Sigaev)

• Fix possible deadlock during concurrent CREATE INDEX CONCURRENTLY operations (Tom Lane)

• Fix GiST index lookup crash (Tom Lane)

• Fix regexp_matches() handling of zero-length matches (Jeevan Chalke)

  Previously, zero-length matches like '^' could return too many matches.

• Fix crash for overly-complex regular expressions (Heikki Linnakangas)

• Fix regular expression match failures for back references combined with non-greedy quantifiers (Jeevan Chalke)

• Prevent CREATE FUNCTION from checking SET variables unless function body checking is enabled (Tom Lane)

• Allow ALTER DEFAULT PRIVILEGES to operate on schemas without requiring CREATE permission (Tom Lane)

• Loosen restriction on keywords used in queries (Tom Lane)

  Specifically, lessen keyword restrictions for role names, language names, EXPLAIN and COPY options, and SET values. This allows COPY ... (FORMAT BINARY) to work as expected; previously BINARY needed to be quoted.

• Print proper line number during COPY failure (Heikki Linnakangas)

• Fix pgp_pub_decrypt() so it works for secret keys with passwords (Marko Kreen)

• Make pg_upgrade use pg_dump --quote-all-identifiers to avoid problems with keyword changes between releases (Tom Lane)

• Remove rare inaccurate warning during vacuum of index-less tables (Heikki Linnakangas)

• Ensure that VACUUM ANALYZE still runs the ANALYZE phase if its attempt to truncate the file is cancelled due to lock conflicts (Kevin Grittner)

• Avoid possible failure when performing transaction control commands (e.g ROLLBACK) in prepared queries (Tom Lane)

• Ensure that floating-point data input accepts standard spellings of "infinity" on all platforms (Tom Lane)

  The C99 standard says that allowable spellings are inf, +inf, -inf, infinity, +infinity, and -infinity. Make sure we recognize these even if the platform's strtod function doesn't.

• Avoid unnecessary reporting when track_activities is off (Tom Lane)

• Expand ability to compare rows to records and arrays (Rafal Rzepecki, Tom Lane)

• Prevent crash when psql's PSQLRC variable contains a tilde (Bruce Momjian)

• Add spinlock support for ARM64 (Mark Salter)

• Update time zone data files to tzdata release 2013d for DST law changes in Israel, Morocco, Palestine, and Paraguay. Also, historical zone data corrections for Macquarie Island.