Excerpts from Tom Lane's message of jue jun 28 12:07:58 -0400 2012:

> When this came up a couple weeks ago, the argument that was made for it
> was that you could attach non-significant columns to an index that *is*
> unique.  That might or might not be a wide enough use-case to justify
> adding such a horrid kludge.

The other question is whether such an index would prevent an update from
being HOT when the non-indexed values are touched.  That could be a
significant difference.

Álvaro Herrera <alvhe...@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

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