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