At a high level, VMware GemFire does not support the following querying features:
Static method invocations. For example, the following query is invalid:
SELECT DISTINCT * FROM /QueryRegion0 WHERE aDay = Day.Wednesday
You cannot create an index on fields using Set/List types (Collection types) that are not comparable. The OQL index implementation expects fields to be Comparable. To workaround this, you can create a custom Collection type that implements Comparable.