public void addPost(String post) {
        Preconditions.expectNotBlank(post, ErrorCodeEnum.INVALID_PARAMETER, "Post node should not be empty");
        if (postNodes == null) {
            postNodes = Sets.newHashSet();
        }
        postNodes.add(post);
    }
Stream node, including data node name, pre node name, post node name, field list.
inlong-manager/manager-pojo/src/main/java/org/apache/inlong/manager/pojo/stream/StreamNode.java