presto-main/src/main/java/io/prestosql/operator/scalar/ArrayJoin.java/ArrayJoin/specialize
class ArrayJoin:    @Override
    public ScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, Metadata metadata)
    {
        return specializeArrayJoin(boundVariables.getTypeVariables(), metadata, ImmutableList.of(false, false), METHOD_HANDLE);
    }