When using NoSQL selection rules at a Google Datastore NoSQL database, the following restrictions apply:
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Use of OR is not supported.
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Use of the ≠, Exists, and Does not exist operators is not supported.
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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.