Restrictions When Using Google Datastore

When using NoSQL selection rules at a Google Datastore NoSQL database, the following restrictions apply:

•      Use of OR is not supported.

•      Use of the ≠, Exists and Does not exist operators is not supported.

•      If more than one column is referenced in a rule’s criteria, a Datastore composite index covering the columns in question must be configured prior to rule execution.

If any of the above are not observed, rule execution will fail.