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Fix WAL-logging of truncation of relation free space maps and visibility maps (Pavan Deolasee, Heikki Linnakangas)

It was possible for these files to not be correctly restored during crash recovery, or to be written incorrectly on a standby server. Bogus entries in a free space map could lead to attempts to access pages that have been truncated away from the relation itself, typically producing errors like“could not read blockXXX: read only 0 of 8192 bytes”. Checksum failures in the visibility map are also possible, if checksumming is enabled.

Procedures for determining whether there is a problem and repairing it if so are discussed athttps://wiki.postgresql.org/wiki/Free_Space_Map_Problems.

Fix incorrect creation of GIN index WAL records on big-endian machines (Tom Lane)

The typical symptom was“unexpected GIN leaf action” errors during WAL replay.

FixSELECT FOR UPDATE/SHARE to correctly lock tuples that have been updated by a subsequently-aborted transaction (Álvaro Herrera)

In 9.5 and later, theSELECT would sometimes fail to return such tuples at all. A failure has not been proven to occur in earlier releases, but might be possible with concurrent updates.

Fix EvalPlanQual rechecks involving CTE scans (Tom Lane)

The recheck would always see the CTE as returning no rows, typically leading to failure to update rows that were recently updated.

Fix deletion of speculatively inserted TOAST tuples when backing out ofINSERT ... ON CONFLICT (Oskari Saarenmaa)

In the race condition where two transactions try to insert conflicting tuples at about the same time, the loser would fail with an“attempted to delete invisible tuple” error if its insertion included any TOAST'ed fields.

Don't throw serialization errors for self-conflicting insertions inINSERT ... ON CONFLICT (Thomas Munro, Peter Geoghegan)

Fix improper repetition of previous results from hashed aggregation in a subquery (Andrew Gierth)

The test to see if we can reuse a previously-computed hash table of the aggregate state values neglected the possibility of an outer query reference appearing in an aggregate argument expression. A change in the value of such a reference should lead to recalculating the hash table, but did not.

Fix query-lifespan memory leak in a bulkUPDATE on a table with aPRIMARY KEY orREPLICA IDENTITY index (Tom Lane)

FixCOPY with a column name list from a table that has row-level security enabled (Adam Brightwell)

FixEXPLAIN to emit valid XML whentrack_io_timing is on (Markus Winand)

Previously the XML output-format option produced syntactically invalid tags such as<I/O-Read-Time>. That is now rendered as<I-O-Read-Time>.

Suppress printing of zeroes for unmeasured times inEXPLAIN (Maksim Milyutin)

Certain option combinations resulted in printing zero values for times that actually aren't ever measured in that combination. Our general policy inEXPLAIN is not to print such fields at all, so do that consistently in all cases.

Fix statistics update forTRUNCATE in a prepared transaction (Stas Kelvich)

Fix timeout length whenVACUUM is waiting for exclusive table lock so that it can truncate the table (Simon Riggs)

The timeout was meant to be 50 milliseconds, but it was actually only 50 microseconds, causingVACUUM to give up on truncation much more easily than intended. Set it to the intended value.

Fix bugs in merging inheritedCHECK constraints while creating or altering a table (Tom Lane, Amit Langote)

Allow identicalCHECK constraints to be added to a parent and child table in either order. Prevent merging of a valid constraint from the parent table with aNOT VALID constraint on the child. Likewise, prevent merging of aNO INHERIT child constraint with an inherited constraint.

Show a sensible value inpg_settings.unit formin_wal_size andmax_wal_size (Tom Lane)

Remove artificial restrictions on the values accepted bynumeric_in() andnumeric_recv() (Tom Lane)

We allow numeric values up to the limit of the storage format (more than1e100000), so it seems fairly pointless thatnumeric_in() rejected scientific-notation exponents above 1000. Likewise, it was silly fornumeric_recv() to reject more than 1000 digits in an input value.

Avoid very-low-probability data corruption due to testing tuple visibility without holding buffer lock (Thomas Munro, Peter Geoghegan, Tom Lane)

Preserve commit timestamps across server restart (Julien Rouhaud, Craig Ringer)

Withtrack_commit_timestamp turned on, old commit timestamps became inaccessible after a clean server restart.

Fix logical WAL decoding to work properly when a subtransaction's WAL output is large enough to spill to disk (Andres Freund)

Fix possible sorting error when aborting use of abbreviated keys (Peter Geoghegan)

In the worst case, this could result in a corrupt btree index, which would need to be rebuilt usingREINDEX. However, the situation is believed to be rare.

Fix file descriptor leakage when truncating a temporary relation of more than 1GB (Andres Freund)

Disallow starting a standalone backend withstandby_mode turned on (Michael Paquier)

This can't do anything useful, since there will be no WAL receiver process to fetch more WAL data; and it could result in misbehavior in code that wasn't designed with this situation in mind.

Properly initialize replication slot state when recycling a previously-used slot (Michael Paquier)

This failure to reset all of the fields of the slot could preventVACUUM from removing dead tuples.

Round shared-memory allocation request to a multiple of the actual huge page size when attempting to use huge pages on Linux (Tom Lane)

This avoids possible failures duringmunmap() on systems with atypical default huge page sizes. Except in crash-recovery cases, there were no ill effects other than a log message.

Use a more random value for the dynamic shared memory control segment's ID (Robert Haas, Tom Lane)

Previously, the same value would be chosen every time, because it was derived fromrandom() butsrandom() had not yet been called. While relatively harmless, this was not the intended behavior.

On Windows, retry creation of the dynamic shared memory control segment after an access-denied error (Kyotaro Horiguchi, Amit Kapila)

Windows sometimes returnsERROR_ACCESS_DENIED rather thanERROR_ALREADY_EXISTS when there is an existing segment. This led to postmaster startup failure due to believing that the former was an unrecoverable error.

FixPL/pgSQL to not misbehave with parameters and local variables of typeint2vector oroidvector (Tom Lane)

Don't try to share SSL contexts across multiple connections inlibpq (Heikki Linnakangas)

This led to assorted corner-case bugs, particularly when trying to use different SSL parameters for different connections.

Avoid corner-case memory leak inlibpq (Tom Lane)

The reported problem involved leaking an error report duringPQreset(), but there might be related cases.

Makeecpg's--help and--version options work consistently with our other executables (Haribabu Kommi)

Fixpgbench's calculation of average latency (Fabien Coelho)

The calculation was incorrect when there were\sleep commands in the script, or when the test duration was specified in number of transactions rather than total time.

Inpg_upgrade, check library loadability in name order (Tom Lane)

This is a workaround to deal with cross-extension dependencies from language transform modules to their base language and data type modules.

Inpg_dump, never dump range constructor functions (Tom Lane)

This oversight led topg_upgrade failures with extensions containing range types, due to duplicate creation of the constructor functions.

Inpg_dump with-C, suppressTABLESPACE clause ofCREATE DATABASE if--no-tablespaces is specified (Tom Lane)

Makepg_receivexlog work correctly with--synchronous without slots (Gabriele Bartolini)

Disallow specifying both--source-server and--source-target options topg_rewind (Michael Banck)

Makepg_rewind turn offsynchronous_commit in its session on the source server (Michael Banck, Michael Paquier)

This allowspg_rewind to work even when the source server is using synchronous replication that is not working for some reason.

Inpg_xlogdump, retry opening new WAL segments when using--follow option (Magnus Hagander)

This allows for a possible delay in the server's creation of the next segment.

Fixpg_xlogdump to cope with a WAL file that begins with a continuation record spanning more than one page (Pavan Deolasee)

Fixcontrib/pg_buffercache to work whenshared_buffers exceeds 256GB (KaiGai Kohei)

Fixcontrib/intarray/bench/bench.pl to print the results of theEXPLAIN it does when given the-e option (Daniel Gustafsson)

Support OpenSSL 1.1.0 (Heikki Linnakangas)

Install TAP test infrastructure so that it's available for extension testing (Craig Ringer)

WhenPostgreSQL has been configured with--enable-tap-tests,“make install” will now install the Perl support files for TAP testing where PGXS can find them. This allows non-core extensions to use$(prove_check) without extra tests.

In MSVC builds, includepg_recvlogical in a client-only installation (MauMau)

Update Windows time zone mapping to recognize some time zone names added in recent Windows versions (Michael Paquier)

Prevent failure of obsolete dynamic time zone abbreviations (Tom Lane)

If a dynamic time zone abbreviation does not match any entry in the referenced time zone, treat it as equivalent to the time zone name. This avoids unexpected failures when IANA removes abbreviations from their time zone database, as they did intzdata release 2016f and seem likely to do again in the future. The consequences were not limited to not recognizing the individual abbreviation; any mismatch caused thepg_timezone_abbrevs view to fail altogether.

Update time zone data files totzdata release 2016h for DST law changes in Palestine and Turkey, plus historical corrections for Turkey and some regions of Russia. Switch to numeric abbreviations for some time zones in Antarctica, the former Soviet Union, and Sri Lanka.

The IANA time zone database previously provided textual abbreviations for all time zones, sometimes making up abbreviations that have little or no currency among the local population. They are in process of reversing that policy in favor of using numeric UTC offsets in zones where there is no evidence of real-world use of an English abbreviation. At least for the time being,PostgreSQL will continue to accept such removed abbreviations for timestamp input. But they will not be shown in thepg_timezone_names view nor used for output.

In this update,AMT is no longer shown as being in use to mean Armenia Time. Therefore, we have changed theDefault abbreviation set to interpret it as Amazon Time, thus UTC-4 not UTC+4.