pg_upgarde: The control data check for equal max_index_keys in old and new version

From: neha khatri <nehakhatri5(at)gmail(dot)com>
To: pgsql-novice(at)postgresql(dot)org
Subject: pg_upgarde: The control data check for equal max_index_keys in old and new version
Date: 2016-04-22 03:26:13
Message-ID: CAFO0U+_uiguw7PDTg6QUKhXg=s0Zw=QNGLZASuupagX-16zP0w@mail.gmail.com
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I have recently started working on Postgresql and I was looking in the the
pg_upgrade code. pg_upgrade checks index control data(max_index_keys) to be
equal in the old and new version.

I would like to understand why the number of index columns should be equal
in new and old versions. Can the number of maximum index columns not be
changed from one release to another release.

Neha

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