The patch does 2 things:

Bruce Momjian <bruce@momjian.us>

Commit: 524f4b2d1064d482ba968d46afb081563e97a653
Author: Bruce Momjian <bruce@momjian.us>
Date: 1998-10-21T16:21:29Z
Releases: 7.1.1
The patch does 2 things:

        Fixes  a  bug  in  the rule system that caused a crashing
        backend when a join-view with calculated column  is  used
        in subselect.

        Modifies  EXPLAIN to explain rewritten queries instead of
        the plain SeqScan on a view. Rules can produce very  deep
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Jan.

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