I am sorry but it does not work. With 10000 objects and searching for
2 tags we got following error.
com.google.appengine.api.datastore.DatastoreNeedIndexException: The
built-in indices are not efficient enough for this query and your
data. Please add a composite index for this query.. Unable to
determine what index is missing. This is probably a bug in the App
Engine SDK.
Solution I have proposed is not effecient enough when inserting data.
It may take ~5 seconds per object.
May be we have to host tag search server outside of google app engine.
:(
or decrease number of tags to minimum
On Feb 12, 2:22 pm, Max <max.seven....@gmail.com> wrote:
> Thank You very much it works!
>
> correct code is:-
> query.setFilter("tags == 'hello' &&
> tags == 'world'");
>
> I hope it will work with thousands and millions of records as well. I
> have not tested with large number of data yet.
>
> Thanks again!
>
> On Feb 12, 2:46 am, John Patterson <jdpatter...@gmail.com> wrote:
>
>
>
> > On 12 Feb 2010, at 06:53, Max wrote:
>
> > > I have not coded much in native API but I think it will search first
> > > for hello and then for world then mix results.
>
> > No, it does a "merge join" - only returning entities that match all
> > filters - not separate queries like the JDO contains() creates.
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