On Mon, Oct 31, 2011 at 2:08 PM, Robert Haas <robertmh...@gmail.com> wrote:
>> Multicolumn indices on (c1, c2, ..., cn) can only be used on where
>> clauses involving c1..ck with k<n.
>
> I don't think that's true.  I believe it can be used for a query that
> only touches, say, c2.  It's just extremely inefficient.

Does postgres generate those kinds of plans?
I do not think so. I've never seen it happening.

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