Hello,

Just read an article on how to download data from AppEngine Datastore:
https://developers.google.com/appengine/docs/python/tools/uploadingdata

Is the *post_export_function*, as described in the article, the only way to 
implement Custom Logic? The problem is that, as far as I can see, the 
entities get filtered only after they are downloaded by the Bulkloader, 
that is, on the client side (that's why the function is called *post *export). 
This process is rather slow, though. Is there a possibility to perform that 
filtering on the server? Something like "*pre_export_function*"?

Thank you,
Mikhail

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