presto-parser/src/main/java/io/prestosql/sql/tree/Join.java/Join/getChildren
class Join:    @Override
    public List<Node> getChildren()
    {
        ImmutableList.Builder<Node> nodes = ImmutableList.builder();
        nodes.add(left);
        nodes.add(right);
        criteria.map(JoinCriteria::getNodes)
                .ifPresent(nodes::addAll);
        return nodes.build();
    }