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Tom Lane c5c192d7bd Implement poly_distance(). 
geo_ops.c contains half a dozen functions that are just stubs throwing
ERRCODE_FEATURE_NOT_SUPPORTED.  Since it's been like that for more
than twenty years, there's clearly not a lot of interest in filling in
the stubs.  However, I'm uncomfortable with deleting poly_distance(),
since every other geometric type supports a distance-to-another-object-
of-the-same-type function.  We can easily add this capability by
cribbing from poly_overlap() and path_distance().

It's possible that the (existing) test case for this will show some
numeric instability, but hopefully the buildfarm will expose it if so.

In passing, improve the documentation to try to explain why polygons
are distinct from closed paths in the first place.

Discussion: https://postgr.es/m/3426566.1638832718@sss.pgh.pa.us
 		2021-12-13 17:33:32 -05:00
config Pacify perlcritic. 2021-11-22 15:57:31 -05:00
contrib Create a new type category for "internal use" types. 2021-12-11 14:10:51 -05:00
doc Implement poly_distance(). 2021-12-13 17:33:32 -05:00
src Implement poly_distance(). 2021-12-13 17:33:32 -05:00
.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
.git-blame-ignore-revs Add another old commit to git-blame-ignore-revs. 2021-11-03 17:34:19 -07:00
.gitattributes gitattributes: Add new entry to silence whitespace error 2021-06-05 07:57:31 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:25 -05:00
GNUmakefile.in add missing tag from commit b8c4261e5e 2021-07-01 15:47:46 -04:00
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 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Check for STATUS_DELETE_PENDING on Windows. 2021-12-10 16:19:43 +13:00
configure.ac Check for STATUS_DELETE_PENDING on Windows. 2021-12-10 16:19:43 +13:00

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/.