E.20. Release 9.4.7

E.20.1. Migration to Version 9.4.7

A dump/restore is not required for those running 9.4.X.

However, if you are upgrading from a version earlier than 9.4.6, see Section E.21.

E.20.2. Changes

• Fix incorrect handling of NULL index entries in indexed ROW() comparisons (Tom Lane)

  An index search using a row comparison such as ROW(a, b) > ROW('x', 'y') would stop upon reaching a NULL entry in the b column, ignoring the fact that there might be non-NULL b values associated with later values of a.

• Avoid unlikely data-loss scenarios due to renaming files without adequate fsync() calls before and after (Michael Paquier, Tomas Vondra, Andres Freund)

• Fix bug in json_to_record() when a field of its input object contains a sub-object with a field name matching one of the requested output column names (Tom Lane)

• Fix misformatting of negative time zone offsets by to_char()'s OF format code (Thomas Munro, Tom Lane)

• Ignore recovery_min_apply_delay parameter until recovery has reached a consistent state (Michael Paquier)

  Previously, standby servers would delay application of WAL records in response to recovery_min_apply_delay even while replaying the initial portion of WAL needed to make their database state valid. Since the standby is useless until it's reached a consistent database state, this was deemed unhelpful.

• Correctly handle cases where pg_subtrans is close to XID wraparound during server startup (Jeff Janes)

• Fix assorted bugs in logical decoding (Andres Freund)

  Trouble cases included tuples larger than one page when replica identity is FULL, UPDATEs that change a primary key within a transaction large enough to be spooled to disk, incorrect reports of "subxact logged without previous toplevel record", and incorrect reporting of a transaction's commit time.

• Fix planner error with nested security barrier views when the outer view has a WHERE clause containing a correlated subquery (Dean Rasheed)

• Fix corner-case crash due to trying to free localeconv() output strings more than once (Tom Lane)

• Fix parsing of affix files for ispell dictionaries (Tom Lane)

  The code could go wrong if the affix file contained any characters whose byte length changes during case-folding, for example I in Turkish UTF8 locales.

• Avoid use of sscanf() to parse ispell dictionary files (Artur Zakirov)

  This dodges a portability problem on FreeBSD-derived platforms (including macOS).

• Avoid a crash on old Windows versions (before 7SP1/2008R2SP1) with an AVX2-capable CPU and a Postgres build done with Visual Studio 2013 (Christian Ullrich)

  This is a workaround for a bug in Visual Studio 2013's runtime library, which Microsoft have stated they will not fix in that version.

• Fix psql's tab completion logic to handle multibyte characters properly (Kyotaro Horiguchi, Robert Haas)

• Fix psql's tab completion for SECURITY LABEL (Tom Lane)

  Pressing TAB after SECURITY LABEL might cause a crash or offering of inappropriate keywords.

• Make pg_ctl accept a wait timeout from the PGCTLTIMEOUT environment variable, if none is specified on the command line (Noah Misch)

  This eases testing of slower buildfarm members by allowing them to globally specify a longer-than-normal timeout for postmaster startup and shutdown.

• Fix incorrect test for Windows service status in pg_ctl (Manuel Mathar)

  The previous set of minor releases attempted to fix pg_ctl to properly determine whether to send log messages to Window's Event Log, but got the test backwards.

• Fix pgbench to correctly handle the combination of -C and -M prepared options (Tom Lane)

• In pg_upgrade, skip creating a deletion script when the new data directory is inside the old data directory (Bruce Momjian)

  Blind application of the script in such cases would result in loss of the new data directory.

• In PL/Perl, properly translate empty Postgres arrays into empty Perl arrays (Alex Hunsaker)

• Make PL/Python cope with function names that aren't valid Python identifiers (Jim Nasby)

• Fix multiple mistakes in the statistics returned by contrib/pgstattuple's pgstatindex() function (Tom Lane)

• Remove dependency on psed in MSVC builds, since it's no longer provided by core Perl (Michael Paquier, Andrew Dunstan)

• Update time zone data files to tzdata release 2016c for DST law changes in Azerbaijan, Chile, Haiti, Palestine, and Russia (Altai, Astrakhan, Kirov, Sakhalin, Ulyanovsk regions), plus historical corrections for Lithuania, Moldova, and Russia (Kaliningrad, Samara, Volgograd).