inverse OR distributive law?

From: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>
To: pgsql-hackers(at)postgresql(dot)org
Subject: inverse OR distributive law?
Date: 2005-09-13 23:02:16
Message-ID: 20050914.080216.70224585.ishii@sraoss.co.jp
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Hi,

I have been looking around optimizer's code and found a comment:

/*
* process_duplicate_ors
* Given a list of exprs which are ORed together, try to apply
* the inverse OR distributive law.

Anybody enlighten what "inverse OR distributive law" is?
--
SRA OSS, Inc. Japan
Tatsuo Ishii

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