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From Tom Lane
Subject pgsql/src/backend/optimizer/plan (initsplan.c planmain.c)
Date
Msg-id 200007240311.e6O3B6974568@hub.org
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  Date: Sunday, July 23, 2000 @ 23:11:04
Author: tgl

Update of /home/projects/pgsql/cvsroot/pgsql/src/backend/optimizer/plan
     from hub.org:/home/projects/pgsql/tmp/cvs-serv74468/backend/optimizer/plan

Modified Files:
    initsplan.c planmain.c

-----------------------------  Log Message  -----------------------------

Deduce equality constraints that are implied by transitivity of
mergejoinable qual clauses, and add them to the query quals.  For
example, WHERE a = b AND b = c will cause us to add AND a = c.
This is necessary to ensure that it's safe to use these variables
as interchangeable sort keys, which is something 7.0 knows how to do.
Should provide a useful improvement in planning ability, too.

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