Github user wangmiao1981 commented on the issue:
https://github.com/apache/spark/pull/15770
Option 2 doesn't break our pipeline scheme which only appends the result
column to the input dataframe. Besides the discussions above, the graph is
undirected and the weight list will appear twice for two nodes, while Option 1
only stores the weights once.
Let me try Option 2 today.
Thanks!
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