What you want is called a 'partial index'. The facility to do partial
indexes exists in GAE, but how to do it depends on your data access
layer. Are you python (db or ndb?) or java (jdo/jpa, objectify,
low-level?).
In Objectify-land it looks something like this:
@Index(IfNotNull.class) String name;
You can get effectively the same effect by flagging certain values as
not saved. But there are so many apis and so many ways to do this
that I wouldn't want to try to list them all here.
Jeff
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