GQL: Comparison operator doesn't work

Question

i am trying to execute a GQL query on a location dataset stored in Datastore. Here's some example data:

Name/ID | latitude | longitude
------------------------------
- location1 | 34.4104149048 | -116.850200484
- location2 | 34.4118891533 | -116.865934048
- location3 | 34.4146973835 | -116.847347137

However, this GQL query doesn't return any results:

SELECT * FROM Location WHERE latitude > 1.0

As a simple GQL query where I select all items of type Location works, I am wondering what I am doing wrong?

Thanks in Advance!

Answer 1

Figured this out by myself: I didn't create an index for the latitude and longitude properties, which is apparently needed to query over these properties...