what compression is used in on disk bitmap index implementation

From: "sangeetha k(dot)s" <sangeethakss(at)gmail(dot)com>
To: "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org>
Subject: what compression is used in on disk bitmap index implementation
Date: 2007-02-22 05:47:27
Message-ID: e97b2e560702212147q41c4b299k123550961f3c4a10@mail.gmail.com
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i want to know
1.what compression technique used in on disk implementation of bitmap
index.
2.if we want add a new thing to the development how we can test that
with the database

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