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Tom Lane 46dddf7673 Improve key representation for GIN jsonb_ops, and fix existence-search bug. 
Change the key representation so that values that would exceed 127 bytes
are hashed into short strings, and so that the original JSON datatype of
each value is recorded in the index.  The hashing rule eliminates the major
objection to having this opclass be the default for jsonb, namely that it
could fail for plausible input data (due to GIN's restrictions on maximum
key length).  Preserving datatype information doesn't really buy us much
right now, but it requires no extra space compared to the previous way,
and it might be useful later.

Also, change the consistency-checking functions to request recheck for
exists (jsonb ? text) and related operators.  The original analysis that
this is an exactly checkable query was incorrect, since the index does
not preserve information about whether a key appears at top level in
the indexed JSON object.  Add a test case demonstrating the problem.

Make some other, mostly cosmetic improvements to the code in jsonb_gin.c
as well.

catversion bump due to on-disk data format change in jsonb_ops indexes.
2014-05-09 08:41:26 -04:00
config pgindent run for 9.4 2014-05-06 12:12:18 -04:00
contrib Avoid some pnstrdup()s when constructing jsonb 2014-05-09 12:46:21 +03:00
doc Document permissions needed for pg_database_size and pg_tablespace_size. 2014-05-08 21:45:02 -04:00
src Improve key representation for GIN jsonb_ops, and fix existence-search bug. 2014-05-09 08:41:26 -04:00
.dir-locals.el Update Emacs configuration 2013-08-13 20:08:44 -04:00
.gitattributes gitattributes: Make syntax compatible with older Git versions 2013-11-12 21:58:46 -05:00
.gitignore Add *.pot to .gitignore 2013-10-19 10:56:52 -04:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Run autoconf in wake of commit a692ee5870. 2014-05-05 20:24:38 -04:00
configure.in Replace SYSTEMQUOTEs with Windows-specific wrapper functions. 2014-05-05 16:07:40 +03:00
COPYRIGHT Update copyright for 2014 2014-01-07 16:05:30 -05:00
GNUmakefile.in Add TAP tests for client programs 2014-04-14 21:33:46 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00

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:

	http://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
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.