What type of NOSQL database is best suited to store hierarchical data?

What type of NoSQL database is best for storing hierarchical data?

For example, I want to store a forum post with a tree structure:

original post
+ re: original post< br /> + re: original post
+ re2: original post
+ re3: original post
+ re2: original post

This is a graph database.
It can be used as a tree database.

http://neo4j.com/

What type of NoSQL database is best for storing hierarchical data?

For example, I want to store a forum post with a tree structure:

original post
+ re: original post< br /> + re: original post
+ re2: original post
+ re3: original post
+ re2: original post

This is a graph database.
It can be used as a tree database.

Neo4j Graph Platform – The Leader in Graph Databases

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SELECT SQL_CALC_FOUND_ROWS wp_s6mz6tyggq_comments.comment_ID FROM wp_s6mz6tyggq_comments WHERE ( comment_approved = '1' ) AND comment_post_ID = 666 ORDER BY wp_s6mz6tyggq_comments.comment_date_gmt ASC, wp_s6mz6tyggq_comments.comment_ID ASC

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