public Map<String,AttributeValue> getLastEvaluatedKey() {
        return lastEvaluatedKey;
    }
Returns the last evaluated key, which can be used as the
exclusiveStartKey to fetch the next page of results. Returns null if this
is the last page of results.

@return	The key-value pairs which map from the attribute name of each component
			of the primary key to its value.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/datamodeling/ScanResultPage.java