presto-main/src/main/java/io/prestosql/spiller/GenericSpillerFactory.java/GenericSpillerFactory/create
class GenericSpillerFactory:    @Override
    public Spiller create(List<Type> types, SpillContext localSpillContext, AggregatedMemoryContext aggregatedMemoryContext)
    {
        return new GenericSpiller(types, localSpillContext, aggregatedMemoryContext, singleStreamSpillerFactory);
    }