Hi Tapir,
You might want to read the "How Entities and Indexes are Stored"
article from the "Mastering the Datastore" series.
http://code.google.com/appengine/articles/datastore/overview.html
You might also check out Alfred Fullers next gen queries talk from
Google IO 2010.
http://code.google.com/events/io/2010/sessions/next-gen-queries-appengine.html
Robert
On Tue, Jul 13, 2010 at 10:12 PM, Tapir <[email protected]> wrote:
> For example, this query:
>
> (isToday==true || isToday==false) && (isThisWeek==true ||
> isThisWeek==false)
> && isThisMonth==true
>
> in fact contains 4 sub queries:
>
> (isToday==true) && (isThisWeek==true) && isThisMonth==true
> (isToday==true) && (isThisWeek==false) && isThisMonth==true
> (isToday==false) && (isThisWeek==true) && isThisMonth==true
> (isToday==false) && (isThisWeek==false) && isThisMonth==true
>
> If use the AnyValue filter, only one sub query is needed:
>
> AnyValue (isToday) && AnyValue(isThisWeek) && isThisMonth==true
>
> BTW, the reason of using one query instead of 4 queries is to decrease
> the number of indexes.
>
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