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Of course there is the property oracle.kv.subRange
but I still wonder about the parentKey issue.
The parentKey value in this context is treated the same as parentKey argument to the KVStore.storeIterator() methods. As described in the javadoc for those API calls:
parentKey - the parent key whose "child" KV pairs are to be fetched. It may be null to fetch all keys in the store. If non-null, the major key path must be a partial path and the minor key path must be empty.
So, in fact, the parentKey MUST NOT be a complete major key - it must be partial. There must be majorKey components following the parentKey that is specified. The subRange argument does interacts with this though. In the example, if you leave parentKey as "/user" but add a subRange parameter with value
"Iemail@example.comfirstname.lastname@example.org/I" you would achieve the result that I think you originally anticipated.