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Tom Lane 5836d32655 Fix minor violations of FunctionCallInvoke usage protocol. 
Working on commit 1c455078b led me to check through FunctionCallInvoke
call sites to see if every one was being honest about (a) making sure
that fcinfo.isnull is initially false, and (b) checking its state after
the call.  Sure enough, I found some violations.

The main one is that finalize_partialaggregate re-used serialfn_fcinfo
without resetting isnull, even though it clearly intends to cater for
serialfns that return NULL.  There would only be an issue with a
non-strict serialfn, since it's unlikely that a serialfn would return
NULL for non-null input.  We have no non-strict serialfns in core, and
there may be none in the wild either, which would account for the lack
of complaints.  Still, it's clearly wrong, so back-patch that fix to
9.6 where finalize_partialaggregate was introduced.

Also, arrayfuncs.c and rowtypes.c contained various callers that were
not bothering to check for result nulls.  While what's being called is
a comparison or hash function that probably *shouldn't* return null,
that's a lousy excuse for not having any check at all.  There are
existing places that just Assert(!fcinfo->isnull) in comparable
situations, so I added that to the places that were calling btree
comparison or hash support functions.  In the places calling
boolean-returning equality functions, it's quite cheap to have them
treat isnull as FALSE, so make those places do that.  Also remove some
"locfcinfo->isnull = false" assignments that are unnecessary given the
assumption that no previous call returned null.  These changes seem like
mostly neatnik-ism or debugging support, so I didn't back-patch.
 		2020-04-21 14:23:53 -04:00
config Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
contrib Fix cache reference leak in contrib/sepgsql. 2020-04-16 14:45:54 -04:00
doc Fix detaching partitions with cloned row triggers 2020-04-21 13:57:00 -04:00
src Fix minor violations of FunctionCallInvoke usage protocol. 2020-04-21 14:23:53 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:45 -05:00
GNUmakefile.in Add support for automatically updating Unicode derived files 2020-01-09 10:08:14 +01:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Enable Unix-domain sockets support on Windows 2020-03-28 15:01:01 +01:00
configure.in Define EXEC_BACKEND in pg_config_manual.h 2020-03-25 14:31:14 +01:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.