presto-main/src/main/java/io/prestosql/operator/PartitionedLookupSourceFactory.java/PartitionedLookupSourceFactory/disposeSpilledLookupSource
class PartitionedLookupSourceFactory:    private void disposeSpilledLookupSource(int partitionNumber)
    {
        getSpilledLookupSourceHandle(partitionNumber).dispose();
    }