Import PostgreSQL code as of the following commit:

  commit ab5e9caa4a3ec4765348a0482e88edcf3f6aab4a
  Author: Tom Lane <[email protected]>
  Date:   Mon May 7 16:51:40 2018 -0400

      Stamp 10.4.

src/postgres/.dir-locals.el

@@ -0,0 +1,19 @@
+;; see also src/tools/editors/emacs.samples for more complete settings
+
+((c-mode . ((c-basic-offset . 4)
+            (c-file-style . "bsd")
+            (fill-column . 78)
+            (indent-tabs-mode . t)
+            (tab-width . 4)))
+ (dsssl-mode . ((indent-tabs-mode . nil)))
+ (nxml-mode . ((indent-tabs-mode . nil)))
+ (perl-mode . ((perl-indent-level . 4)
+               (perl-continued-statement-offset . 4)
+               (perl-continued-brace-offset . 4)
+               (perl-brace-offset . 0)
+               (perl-brace-imaginary-offset . 0)
+               (perl-label-offset . -2)
+               (indent-tabs-mode . t)
+               (tab-width . 4)))
+ (sgml-mode . ((fill-column . 78)
+               (indent-tabs-mode . nil))))

src/postgres/.gitattributes

@@ -0,0 +1,35 @@
+*		whitespace=space-before-tab,trailing-space
+*.[chly]	whitespace=space-before-tab,trailing-space,indent-with-non-tab,tabwidth=4
+*.dsl		whitespace=space-before-tab,trailing-space,tab-in-indent
+*.patch		-whitespace
+*.pl		whitespace=space-before-tab,trailing-space,tabwidth=4
+*.po		whitespace=space-before-tab,trailing-space,tab-in-indent,-blank-at-eof
+*.sgml		whitespace=space-before-tab,trailing-space,tab-in-indent,-blank-at-eol
+*.x[ms]l	whitespace=space-before-tab,trailing-space,tab-in-indent
+
+# Avoid confusing ASCII underlines with leftover merge conflict markers
+README		conflict-marker-size=32
+README.*	conflict-marker-size=32
+
+# Certain data files that contain special whitespace, and other special cases
+*.data						-whitespace
+contrib/pgcrypto/sql/pgp-armor.sql		whitespace=-blank-at-eol
+doc/bug.template				whitespace=space-before-tab,-blank-at-eof,blank-at-eol
+src/backend/catalog/sql_features.txt		whitespace=space-before-tab,blank-at-eof,-blank-at-eol
+
+# Test output files that contain extra whitespace
+*.out					-whitespace
+contrib/*/output/*.source		-whitespace
+src/test/regress/output/*.source	-whitespace
+src/interfaces/ecpg/test/expected/*	-whitespace
+src/interfaces/libpq/test/expected.out	whitespace=-blank-at-eof
+
+# These files are maintained or generated elsewhere.  We take them as is.
+configure				-whitespace
+ppport.h				-whitespace
+src/backend/regex/COPYRIGHT		-whitespace
+src/backend/regex/re_syntax.n		-whitespace
+src/backend/snowball/libstemmer/*.c	-whitespace
+src/backend/utils/mb/Unicode/*-std.txt	-whitespace
+src/include/snowball/libstemmer/*	-whitespace
+src/timezone/data/*			-whitespace

src/postgres/.gitignore

@@ -0,0 +1,42 @@
+# Global excludes across all subdirectories
+*.o
+*.obj
+*.so
+*.so.[0-9]
+*.so.[0-9].[0-9]
+*.so.[0-9].[0-9][0-9]
+*.sl
+*.sl.[0-9]
+*.sl.[0-9].[0-9]
+*.sl.[0-9].[0-9][0-9]
+*.dylib
+*.dll
+*.exp
+*.a
+*.mo
+*.pot
+objfiles.txt
+.deps/
+*.gcno
+*.gcda
+*.gcov
+*.gcov.out
+lcov.info
+coverage/
+*.vcproj
+*.vcxproj
+win32ver.rc
+*.exe
+lib*dll.def
+lib*.pc
+
+# Local excludes in root directory
+/GNUmakefile
+/config.cache
+/config.log
+/config.status
+/pgsql.sln
+/pgsql.sln.cache
+/Debug/
+/Release/
+/tmp_install/

src/postgres/COPYRIGHT

@@ -0,0 +1,23 @@
+PostgreSQL Database Management System
+(formerly known as Postgres, then as Postgres95)
+
+Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+
+Portions Copyright (c) 1994, The Regents of the University of California
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose, without fee, and without a written agreement
+is hereby granted, provided that the above copyright notice and this
+paragraph and the following two paragraphs appear in all copies.
+
+IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
+DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
+LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
+DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
+PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

src/postgres/GNUmakefile.in

@@ -0,0 +1,130 @@
+#
+# PostgreSQL top level makefile
+#
+# GNUmakefile.in
+#
+
+subdir =
+top_builddir = .
+include $(top_builddir)/src/Makefile.global
+
+$(call recurse,all install,src config)
+
+all:
+	+@echo "All of PostgreSQL successfully made. Ready to install."
+
+docs:
+	$(MAKE) -C doc all
+
+$(call recurse,world,doc src config contrib,all)
+world:
+	+@echo "PostgreSQL, contrib, and documentation successfully made. Ready to install."
+
+# build src/ before contrib/
+world-contrib-recurse: world-src-recurse
+
+html man:
+	$(MAKE) -C doc $@
+
+install:
+	+@echo "PostgreSQL installation complete."
+
+install-docs:
+	$(MAKE) -C doc install
+
+$(call recurse,install-world,doc src config contrib,install)
+install-world:
+	+@echo "PostgreSQL, contrib, and documentation installation complete."
+
+# build src/ before contrib/
+install-world-contrib-recurse: install-world-src-recurse
+
+$(call recurse,installdirs uninstall init-po update-po,doc src config)
+
+$(call recurse,distprep coverage,doc src config contrib)
+
+# clean, distclean, etc should apply to contrib too, even though
+# it's not built by default
+$(call recurse,clean,doc contrib src config)
+clean:
+	rm -rf tmp_install/
+# Garbage from autoconf:
+	@rm -rf autom4te.cache/
+
+# Important: distclean `src' last, otherwise Makefile.global
+# will be gone too soon.
+distclean maintainer-clean:
+	$(MAKE) -C doc $@
+	$(MAKE) -C contrib $@
+	$(MAKE) -C config $@
+	$(MAKE) -C src $@
+	rm -rf tmp_install/
+# Garbage from autoconf:
+	@rm -rf autom4te.cache/
+	rm -f config.cache config.log config.status GNUmakefile
+
+check check-tests installcheck installcheck-parallel installcheck-tests:
+	$(MAKE) -C src/test/regress $@
+
+$(call recurse,check-world,src/test src/pl src/interfaces/ecpg contrib src/bin,check)
+
+$(call recurse,installcheck-world,src/test src/pl src/interfaces/ecpg contrib src/bin,installcheck)
+
+GNUmakefile: GNUmakefile.in $(top_builddir)/config.status
+	./config.status $@
+
+
+##########################################################################
+
+distdir	= postgresql-$(VERSION)
+dummy	= =install=
+garbage = =*  "#"*  ."#"*  *~*  *.orig  *.rej  core  postgresql-*
+
+dist: $(distdir).tar.gz $(distdir).tar.bz2
+	rm -rf $(distdir)
+
+$(distdir).tar: distdir
+	$(TAR) chf $@ $(distdir)
+
+.INTERMEDIATE: $(distdir).tar
+
+distdir-location:
+	@echo $(distdir)
+
+distdir:
+	rm -rf $(distdir)* $(dummy)
+	for x in `cd $(top_srcdir) && find . \( -name CVS -prune \) -o \( -name .git -prune \) -o -print`; do \
+	  file=`expr X$$x : 'X\./\(.*\)'`; \
+	  if test -d "$(top_srcdir)/$$file" ; then \
+	    mkdir "$(distdir)/$$file" && chmod 777 "$(distdir)/$$file";	\
+	  else \
+	    ln "$(top_srcdir)/$$file" "$(distdir)/$$file" >/dev/null 2>&1 \
+	      || cp "$(top_srcdir)/$$file" "$(distdir)/$$file"; \
+	  fi || exit; \
+	done
+	$(MAKE) -C $(distdir) distprep
+	$(MAKE) -C $(distdir)/doc/src/sgml/ INSTALL
+	cp $(distdir)/doc/src/sgml/INSTALL $(distdir)/
+	$(MAKE) -C $(distdir) distclean
+	rm -f $(distdir)/README.git
+
+distcheck: dist
+	rm -rf $(dummy)
+	mkdir $(dummy)
+	$(GZIP) -d -c $(distdir).tar.gz | $(TAR) xf -
+	install_prefix=`cd $(dummy) && pwd`; \
+	cd $(distdir) \
+	&& ./configure --prefix="$$install_prefix"
+	$(MAKE) -C $(distdir) -q distprep
+	$(MAKE) -C $(distdir)
+	$(MAKE) -C $(distdir) install
+	$(MAKE) -C $(distdir) uninstall
+	@echo "checking whether \`$(MAKE) uninstall' works"
+	test `find $(dummy) ! -type d | wc -l` -eq 0
+	$(MAKE) -C $(distdir) dist
+# Room for improvement: Check here whether this distribution tarball
+# is sufficiently similar to the original one.
+	rm -rf $(distdir) $(dummy)
+	@echo "Distribution integrity checks out."
+
+.PHONY: dist distdir distcheck docs install-docs world check-world install-world installcheck-world

src/postgres/HISTORY

@@ -0,0 +1,5 @@
+Release notes for all versions of PostgreSQL can be found on-line at
+https://www.postgresql.org/docs/current/static/release.html
+
+Distribution file sets include release notes for their version and preceding
+versions.  Visit the file doc/src/sgml/html/release.html in an HTML browser.

src/postgres/Makefile

@@ -0,0 +1,41 @@
+# The PostgreSQL make files exploit features of GNU make that other
+# makes do not have. Because it is a common mistake for users to try
+# to build Postgres with a different make, we have this make file
+# that, as a service, will look for a GNU make and invoke it, or show
+# an error message if none could be found.
+
+# If the user were using GNU make now, this file would not get used
+# because GNU make uses a make file named "GNUmakefile" in preference
+# to "Makefile" if it exists. PostgreSQL is shipped with a
+# "GNUmakefile". If the user hasn't run the configure script yet, the
+# GNUmakefile won't exist yet, so we catch that case as well.
+
+
+# AIX make defaults to building *every* target of the first rule.  Start with
+# a single-target, empty rule to make the other targets non-default.
+all:
+
+all check install installdirs installcheck installcheck-parallel uninstall clean distclean maintainer-clean dist distcheck world check-world install-world installcheck-world:
+	@if [ ! -f GNUmakefile ] ; then \
+	   echo "You need to run the 'configure' program first. See the file"; \
+	   echo "'INSTALL' for installation instructions." ; \
+	   false ; \
+	 fi
+	@IFS=':' ; \
+	 for dir in $$PATH; do \
+	   for prog in gmake gnumake make; do \
+	     if [ -f $$dir/$$prog ] && ( $$dir/$$prog -f /dev/null --version 2>/dev/null | grep GNU >/dev/null 2>&1 ) ; then \
+	       GMAKE=$$dir/$$prog; \
+	       break 2; \
+	     fi; \
+	   done; \
+	 done; \
+	\
+	 if [ x"$${GMAKE+set}" = xset ]; then \
+	   echo "Using GNU make found at $${GMAKE}"; \
+	   unset MAKEFLAGS; unset MAKELEVEL; \
+	   $${GMAKE} $@ ; \
+	 else \
+	   echo "You must use GNU make to build PostgreSQL." ; \
+	   false; \
+	 fi

src/postgres/README

@@ -0,0 +1,27 @@
+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/.

src/postgres/README.git

@@ -0,0 +1,14 @@
+(This file does not appear in release tarballs.)
+
+In a release or snapshot tarball of PostgreSQL, a documentation file named
+INSTALL will appear in this directory.  However, this file is not stored in
+git and so will not be present if you are using a git checkout.
+
+If you are using a git checkout, you can view the most recent installation
+instructions at:
+	https://www.postgresql.org/docs/devel/static/installation.html
+
+Users compiling from git will also need compatible versions of Bison, Flex,
+and Perl, as discussed in the install documentation.  These programs are not
+needed when using a tarball, since the files they are needed to build are
+already present in the tarball.  (On Windows, however, you need Perl anyway.)

src/postgres/aclocal.m4

@@ -0,0 +1,14 @@
+dnl aclocal.m4
+m4_include([config/ac_func_accept_argtypes.m4])
+m4_include([config/ax_prog_perl_modules.m4])
+m4_include([config/ax_pthread.m4])
+m4_include([config/c-compiler.m4])
+m4_include([config/c-library.m4])
+m4_include([config/docbook.m4])
+m4_include([config/general.m4])
+m4_include([config/libtool.m4])
+m4_include([config/perl.m4])
+m4_include([config/pkg.m4])
+m4_include([config/programs.m4])
+m4_include([config/python.m4])
+m4_include([config/tcl.m4])

src/postgres/config/Makefile

@@ -0,0 +1,17 @@
+# config/Makefile
+
+subdir = config
+top_builddir = ..
+include $(top_builddir)/src/Makefile.global
+
+
+install: all installdirs
+	$(INSTALL_SCRIPT) $(srcdir)/install-sh '$(DESTDIR)$(pgxsdir)/config/install-sh'
+	$(INSTALL_SCRIPT) $(srcdir)/missing '$(DESTDIR)$(pgxsdir)/config/missing'
+
+installdirs:
+	$(MKDIR_P) '$(DESTDIR)$(pgxsdir)/config'
+
+uninstall:
+	rm -f '$(DESTDIR)$(pgxsdir)/config/install-sh'
+	rm -f '$(DESTDIR)$(pgxsdir)/config/missing'