PostgreSQL 9.3.19 commit log

Stamp 9.3.19.

  
commit   : 93067c53ae49eaa1fe7bedaf2ba4e3e8f2a6cbfa    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 28 Aug 2017 17:28:16 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 28 Aug 2017 17:28:16 -0400    

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Doc: adjust release-note credit for parallel pg_restore fix.

  
commit   : a711d6a31c36d0a2ecf44755c1f3b78e682b4225    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 28 Aug 2017 11:40:48 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 28 Aug 2017 11:40:48 -0400    

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Discussion: https://postgr.es/m/CAFcNs+pJ6_Ud-zg3vY_Y0mzfESdM34Humt8avKrAKq_H+v18Cg@mail.gmail.com  
  

Translation updates

  
commit   : 1e5446eac211bc11139a8c9f150c139b990cd3f3    
  
author   : Peter Eisentraut <peter_e@gmx.net>    
date     : Mon, 28 Aug 2017 10:09:04 -0400    
  
committer: Peter Eisentraut <peter_e@gmx.net>    
date     : Mon, 28 Aug 2017 10:09:04 -0400    

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Source-Git-URL: git://git.postgresql.org/git/pgtranslation/messages.git  
Source-Git-Hash: ef3340570fcdce8fd9695fa85904448acdb92e06  
  

Release notes for 9.6.5, 9.5.9, 9.4.14, 9.3.19, 9.2.23.

  
commit   : bacbfaed1bfff7b09a5183b3b8923a2fa43c78ba    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sun, 27 Aug 2017 17:35:04 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sun, 27 Aug 2017 17:35:04 -0400    

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Backpatch introduction of TupleDescAttr(tupdesc, i).

  
commit   : 5b286cae3cc1c43d6eedf6cf1181d41f653c6a93    
  
author   : Andres Freund <andres@anarazel.de>    
date     : Tue, 22 Aug 2017 07:46:05 -0700    
  
committer: Andres Freund <andres@anarazel.de>    
date     : Tue, 22 Aug 2017 07:46:05 -0700    

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2cd70845240 / c6293249d change the way individual attributes in a  
TupleDesc are stored / accessed.  To reduce the effort of making  
extensions compatible with postgresql 11, and to ease future  
backpatching, backpatch introduction of TupleDescAttr() to all  
releases.  Do not backpatch change in storage, as that'd be a breaking  
change for existing and working extensions.  
  
Author: Andres Freund  
Discussion: https://postgr.es/m/20170820181723.tdswdinzptbcwhrr@alap3.anarazel.de  
Backpatch: 9.2-  
  

Fix possible core dump in parallel restore when using a TOC list.

  
commit   : ece4bd901387fb66ae5077206f2ec53351b85df3    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sat, 19 Aug 2017 13:39:38 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sat, 19 Aug 2017 13:39:38 -0400    

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Commit 3eb9a5e7c unintentionally introduced an ordering dependency  
into restore_toc_entries_prefork().  The existing coding of  
reduce_dependencies() contains a check to skip moving a TOC entry  
to the ready_list if it wasn't initially in the pending_list.  
This used to suffice to prevent reduce_dependencies() from trying to  
move anything into the ready_list during restore_toc_entries_prefork(),  
because the pending_list stayed empty throughout that phase; but it no  
longer does.  The problem doesn't manifest unless the TOC has been  
reordered by SortTocFromFile, which is how I missed it in testing.  
  
To fix, just add a test for ready_list == NULL, converting the call  
with NULL from a poor man's sanity check into an explicit command  
not to touch TOC items' list membership.  Clarify some of the comments  
around this; in particular, note the primary purpose of the check for  
pending_list membership, which is to ensure that we can't try to restore  
the same item twice, in case a TOC list forces it to be restored before  
its dependency count goes to zero.  
  
Per report from Fabrízio de Royes Mello.  Back-patch to 9.3, like the  
previous commit.  
  
Discussion: https://postgr.es/m/CAFcNs+pjuv0JL_x4+=71TPUPjdLHOXA4YfT32myj_OrrZb4ohA@mail.gmail.com  
  

Further tweaks to compiler flags for PL/Perl on Windows.

  
commit   : bc4404405f21975076643cdaa1a99835c1b6f48b    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Thu, 17 Aug 2017 13:15:36 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Thu, 17 Aug 2017 13:15:36 -0400    

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It now emerges that we can only rely on Perl to tell us we must use  
-D_USE_32BIT_TIME_T if it's Perl 5.13.4 or later.  For older versions,  
revert to our previous practice of assuming we need that symbol in  
all 32-bit Windows builds.  This is not ideal, but inquiring into  
which compiler version Perl was built with seems far too fragile.  
In any case, we had not previously had complaints about these old  
Perl versions, so let's assume this is Good Enough.  (It's still  
better than the situation ante commit 5a5c2feca, in that at least  
the effects are confined to PL/Perl rather than the whole PG build.)  
  
Back-patch to all supported versions, like 5a5c2feca and predecessors.  
  
Discussion: https://postgr.es/m/CANFyU97OVQ3+Mzfmt3MhuUm5NwPU=-FtbNH5Eb7nZL9ua8=rcA@mail.gmail.com  
  

Changed ecpg parser to allow RETURNING clauses without attached C variables.

  
commit   : f8bc6b2f689dc721c753949854bfe605f33149ca    
  
author   : Michael Meskes <meskes@postgresql.org>    
date     : Mon, 14 Aug 2017 11:29:34 +0200    
  
committer: Michael Meskes <meskes@postgresql.org>    
date     : Mon, 14 Aug 2017 11:29:34 +0200    

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Include foreign tables in information_schema.table_privileges

  
commit   : 9f0f4efc2f1ebbf37c1d52cb8c983d5dad65dcd6    
  
author   : Peter Eisentraut <peter_e@gmx.net>    
date     : Tue, 15 Aug 2017 19:27:22 -0400    
  
committer: Peter Eisentraut <peter_e@gmx.net>    
date     : Tue, 15 Aug 2017 19:27:22 -0400    

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This appears to have been an omission in the original commit  
0d692a0dc9f.  All related information_schema views already include  
foreign tables.  
  
Reported-by: Nicolas Thauvin <nicolas.thauvin@dalibo.com>  
  

Handle elog(FATAL) during ROLLBACK more robustly.

  
commit   : cd184273ba9dd2020539685593edb9c0c8e8689d    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 14 Aug 2017 15:43:20 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 14 Aug 2017 15:43:20 -0400    

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Stress testing by Andreas Seltenreich disclosed longstanding problems that  
occur if a FATAL exit (e.g. due to receipt of SIGTERM) occurs while we are  
trying to execute a ROLLBACK of an already-failed transaction.  In such a  
case, xact.c is in TBLOCK_ABORT state, so that AbortOutOfAnyTransaction  
would skip AbortTransaction and go straight to CleanupTransaction.  This  
led to an assert failure in an assert-enabled build (due to the ROLLBACK's  
portal still having a cleanup hook) or without assertions, to a FATAL exit  
complaining about "cannot drop active portal".  The latter's not  
disastrous, perhaps, but it's messy enough to want to improve it.  
  
We don't really want to run all of AbortTransaction in this code path.  
The minimum required to clean up the open portal safely is to do  
AtAbort_Memory and AtAbort_Portals.  It seems like a good idea to  
do AtAbort_Memory unconditionally, to be entirely sure that we are  
starting with a safe CurrentMemoryContext.  That means that if the  
main loop in AbortOutOfAnyTransaction does nothing, we need an extra  
step at the bottom to restore CurrentMemoryContext = TopMemoryContext,  
which I chose to do by invoking AtCleanup_Memory.  This'll result in  
calling AtCleanup_Memory twice in many of the paths through this function,  
but that seems harmless and reasonably inexpensive.  
  
The original motivation for the assertion in AtCleanup_Portals was that  
we wanted to be sure that any user-defined code executed as a consequence  
of the cleanup hook runs during AbortTransaction not CleanupTransaction.  
That still seems like a valid concern, and now that we've seen one case  
of the assertion firing --- which means that exactly that would have  
happened in a production build --- let's replace the Assert with a runtime  
check.  If we see the cleanup hook still set, we'll emit a WARNING and  
just drop the hook unexecuted.  
  
This has been like this a long time, so back-patch to all supported  
branches.  
  
Discussion: https://postgr.es/m/877ey7bmun.fsf@ansel.ydns.eu  
  

Absorb -D_USE_32BIT_TIME_T switch from Perl, if relevant.

  
commit   : 25169b948e1376832f502d4899af3c3ff7f7570d    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 14 Aug 2017 11:48:59 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Mon, 14 Aug 2017 11:48:59 -0400    

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Commit 3c163a7fc's original choice to ignore all #define symbols whose  
names begin with underscore turns out to be too simplistic.  On Windows,  
some Perl installations are built with -D_USE_32BIT_TIME_T, and we must  
absorb that or we get the wrong result for sizeof(PerlInterpreter).  
  
This effectively re-reverts commit ef58b87df, which injected that symbol  
in a hacky way, making it apply to all of Postgres not just PL/Perl.  
More significantly, it did so on *all* 32-bit Windows builds, even when  
the Perl build to be used did not select this option; so that it fails  
to work properly with some newer Perl builds.  
  
By making this change, we would be introducing an ABI break in 32-bit  
Windows builds; but fortunately we have not used type time_t in any  
exported Postgres APIs in a long time.  So it should be OK, both for  
PL/Perl itself and for third-party extensions, if an extension library  
is built with a different _USE_32BIT_TIME_T setting than the core code.  
  
Patch by me, based on research by Ashutosh Sharma and Robert Haas.  
Back-patch to all supported branches, as commit 3c163a7fc was.  
  
Discussion: https://postgr.es/m/CANFyU97OVQ3+Mzfmt3MhuUm5NwPU=-FtbNH5Eb7nZL9ua8=rcA@mail.gmail.com  
  

Remove AtEOXact_CatCache().

  
commit   : bb11ff2bc8afdb264b16dc7d4232ace72382737e    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sun, 13 Aug 2017 16:15:14 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Sun, 13 Aug 2017 16:15:14 -0400    

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The sole useful effect of this function, to check that no catcache  
entries have positive refcounts at transaction end, has really been  
obsolete since we introduced ResourceOwners in PG 8.1.  We reduced the  
checks to assertions years ago, so that the function was a complete  
no-op in production builds.  There have been previous discussions about  
removing it entirely, but consensus up to now was that it had some small  
value as a cross-check for bugs in the ResourceOwner logic.  
  
However, it now emerges that it's possible to trigger these assertions  
if you hit an assert-enabled backend with SIGTERM during a call to  
SearchCatCacheList, because that function temporarily increases the  
refcounts of entries it's intending to add to a catcache list construct.  
In a normal ERROR scenario, the extra refcounts are cleaned up by  
SearchCatCacheList's PG_CATCH block; but in a FATAL exit we do a  
transaction abort and exit without ever executing PG_CATCH handlers.  
  
There's a case to be made that this is a generic hazard and we should  
consider restructuring elog(FATAL) handling so that pending PG_CATCH  
handlers do get run.  That's pretty scary though: it could easily create  
more problems than it solves.  Preliminary stress testing by Andreas  
Seltenreich suggests that there are not many live problems of this ilk,  
so we rejected that idea.  
  
There are more-localized ways to fix the problem; the most principled  
one would be to use PG_ENSURE_ERROR_CLEANUP instead of plain PG_TRY.  
But adding cycles to SearchCatCacheList isn't very appealing.  We could  
also weaken the assertions in AtEOXact_CatCache in some more or less  
ad-hoc way, but that just makes its raison d'etre even less compelling.  
In the end, the most reasonable solution seems to be to just remove  
AtEOXact_CatCache altogether, on the grounds that it's not worth trying  
to fix it.  It hasn't found any bugs for us in many years.  
  
Per report from Jeevan Chalke.  Back-patch to all supported branches.  
  
Discussion: https://postgr.es/m/CAM2+6=VEE30YtRQCZX7_sCFsEpoUkFBV1gZazL70fqLn8rcvBA@mail.gmail.com  
  

Fix handling of container types in find_composite_type_dependencies.

  
commit   : 06931a9c0e2f59bbc88c6cdfca793fc68508152b    
  
author   : Tom Lane <tgl@sss.pgh.pa.us>    
date     : Wed, 9 Aug 2017 17:03:10 -0400    
  
committer: Tom Lane <tgl@sss.pgh.pa.us>    
date     : Wed, 9 Aug 2017 17:03:10 -0400    

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find_composite_type_dependencies correctly found columns that are of  
the specified type, and columns that are of arrays of that type, but  
not columns that are domains or ranges over the given type, its array  
type, etc.  The most general way to handle this seems to be to assume  
that any type that is directly dependent on the specified type can be  
treated as a container type, and processed recursively (allowing us  
to handle nested cases such as ranges over domains over arrays ...).  
Since a type's array type already has such a dependency, we can drop  
the existing special case for the array type.  
  
The very similar logic in get_rels_with_domain was likewise a few  
bricks shy of a load, as it supposed that a directly dependent type  
could *only* be a sub-domain.  This is already wrong for ranges over  
domains, and it'll someday be wrong for arrays over domains.  
  
Add test cases illustrating the problems, and back-patch to all  
supported branches.  
  
Discussion: https://postgr.es/m/15268.1502309024@sss.pgh.pa.us  
  

Reword some unclear comments

  
commit   : 962b26b674d29fa2834afbd760a9229bc42a5876    
  
author   : Alvaro Herrera <alvherre@alvh.no-ip.org>    
date     : Tue, 8 Aug 2017 18:46:16 -0400    
  
committer: Alvaro Herrera <alvherre@alvh.no-ip.org>    
date     : Tue, 8 Aug 2017 18:46:16 -0400    

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