Thanks for the info! In my case there's not really one primary key that would guarantee good clustering for my query, so I guess there's not much that can be do

Thanks for the info! In my case there's not really one primary key that would guarantee good clustering for my query, so I guess there's not much that can be done to optimize here. I'm trying to find all the ancestors of a node in a DAG, so the optimal clustering would vary depending on the node I'm querying for