Fix subtle memory leak in nbr_intersection primitive #3858
Merged
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Closes https://github.com/rapidsai/graph_dl/issues/259
A customer found a subtle memory leak in Jaccard similarity. Tracked it down to this subtle error.
major_nbr_indices
is anstd::optional
that is initialized tostd::nullopt
. Overwriting the dereferenced entry replaces the value but does not mark the optional as containing a value. So the resulting value is never destroyed.