PXD-1262 Fix dictionary graph crashing #343
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This was referenced Dec 25, 2022
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A node can be visited more than once, as we want it to go to its lowest possible level in the tree, but we still want to detect cycles that could cause infinite loops. By mapping out the descendants of each node beforehand, we can avoid reprocessing nodes that are further up the tree than a given node and avoid cycles. This adds O(n) time up front.