Olivier Dony 6da2d94357 [FIX] read_group: remove prohibitive n^2 operations, could freeze the server on large group_by results
This patch replaces two O(n^2) operations, one 
filter and one sort, with O(n) or better operations.
It takes slightly more memory due to the use of
one extra data copy, but takes virtually no time
to process even with 600k result lines, whereas
the previous code would just freeze the server
for a long time.

bzr revid: odo@openerp.com-20120609010549-xdktw6xte7fmxjbq
2012-06-09 03:05:49 +02:00
…
2012-01-12 15:02:34 +01:00
2012-02-22 12:43:22 +01:00
2012-02-24 16:01:43 +01:00
…
…
2012-02-07 13:14:11 +01:00

About OpenERP
-------------

OpenERP is an OpenSource/Free software Enterprise Resource Planning and
Customer Relationship Management software. More info at:

    http://www.openerp.com

Installation on Debian Ubuntu
-----------------------------

Download the deb file and type:

    $ sudo dpkg -i <openerp-deb-filename>
    $ sudo apt-get install install -f

Installation on Debian Ubuntu from nightly build
------------------------------------------------

Add the the apt repository

    deb http://nightly.openerp.com/6.1/deb/ ./

in your source.list and type:

    $ sudo apt-get update
    $ sudo apt-get install openerp

Installation on RedHat, Fedora, CentOS
--------------------------------------

Install the required dependencies:

    $ yum install python
    $ easy_install pip
    $ pip install .....

Install the openerp rpm

    $ rpm -i openerp-VERSION.rpm

Installation on Windows
-----------------------

Installation on MacOSX
-----------------------

Setuping you first database
---------------------------

Point your browser to http://localhost:8069/ and click "Manage Databases", the
default master password is "admin".

Detailed System Requirements
----------------------------

You need the following software installed:

 postgresql-client, python-dateutil, python-feedparser, python-gdata,
 python-ldap, python-libxslt1, python-lxml, python-mako, python-openid,
 python-psycopg2, python-pybabel, python-pychart, python-pydot,
 python-pyparsing, python-reportlab, python-simplejson, python-tz,
 python-vatnumber, python-vobject, python-webdav, python-werkzeug, python-xlwt,
 python-yaml, python-zsi

For Luxembourg localization, you also need:

 pdftk (http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/)

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