ok this question was attended to here:
http://groups.google.com/group/google-appengine/browse_frm/thread/bd047a3179430ce0#

(this thread was a repost, as nobody was answering in the appengine
group)

On Aug 18, 4:11 pm, Juraj Vitko <[email protected]> wrote:
> Given the following two queries and their composite index
> requirements:
>
> Query A:
> SELECT WHERE propA == param1 ORDER BY propB ASC, propC ASC
>
> coposite index required:  1. propA asc, 2. propB asc, 3. propC asc
>
> Query B:
> SELECT WHERE propA == param1 && propB == param2 && propC > param3
> ORDER BY propC ASC
>
> coposite index required:  1. propB asc, 2. propA asc, 3. propC asc
>
> Question 1: Is it a bug that the Query B reverses the index order of
> the first two equality filters?
>
> Question 2: Is it somehow possible to make Query B _reuse_ the
> composite index defined for Query A?
>
> Question 3: Should I fill a feature request so that app engine tries
> to optimize queries to match existing composite indexes, if possible?
>
> Thank you,
> J.
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