postgres

Peter Geoghegan e86c8ef243 Use "low key" terminology in nbtsort.c. nbtree index builds once stashed the "minimum key" for a page, which was used as the basis of the pivot tuple that gets placed in the next level up (i.e. the tuple that stores the downlink to the page in question). It doesn't quite work that way anymore, so the "minimum key" terminology now seems misleading (these days the minimum key is actually a straight copy of the high key from the left sibling, which is a distinct thing in subtle but important ways). Rename this concept to "low key". This name is a lot clearer given that there is now a sharp distinction between pivot and non-pivot tuples. Also remove comments that describe obsolete details about how the minimum key concept used to work. Rather than generating the minus infinity item for the leftmost page on a level by copying the new item and truncating that copy, simply allocate a small buffer. The old approach confusingly created the impression that the new item had some kind of significance. This was another artifact of how things used to work before commits `8224de4f` and `dd299df8`.		6 years ago
config	Simplify PGAC_STRUCT_TIMEZONE Autoconf macro	6 years ago
contrib	Add reusable routine for making arrays unique.	6 years ago
doc	docs: clarify that only INSERT and UPDATE triggers can mod. NEW	6 years ago
src	Use "low key" terminology in nbtsort.c.	6 years ago
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	7 years ago
.gitattributes	Add XSL stylesheet to fix up SVG files	6 years ago
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	8 years ago
COPYRIGHT	Update copyright for 2019	7 years ago
GNUmakefile.in	Add "headerscheck" script to test header-file compilability under C.	6 years ago
HISTORY	Change documentation references to PG website to use https: not http:	8 years ago
Makefile	Don't unset MAKEFLAGS in non-GNU Makefile.	6 years ago
README	Change documentation references to PG website to use https: not http:	8 years ago
README.git	Change documentation references to PG website to use https: not http:	8 years ago
aclocal.m4	Fix configure's AC_CHECK_DECLS tests to work correctly with clang.	7 years ago
configure	Remove HAVE_LONG_LONG_INT	6 years ago
configure.in	Remove HAVE_LONG_LONG_INT	6 years ago

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/.