Horton

inverse OR distributive law?

Tatsuo Ishii <t-ishii@sra.co.jp>

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From: Tatsuo Ishii <t-ishii@sra.co.jp>
To: pgsql-hackers@postgresql.org
Date: 2005-09-13T23:02:16Z
Lists: pgsql-hackers 
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