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Provides the ability to split a query into multiple shards.
public interface QuerySplitter {

Returns a list of sharded for the given query. This will create up to the desired number of splits, however it may return less splits if the desired number of splits is unavailable.

query the query to split.
numSplits the desired number of splits.
datastore the datastore to run on.
DatastoreException if there was a datastore error while generating query splits.
java.lang.IllegalArgumentException if the given query or numSplits was invalid.
  List<QuerygetSplits(Query queryint numSplitsDatastore datastore)
      throws DatastoreException;
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