Github user srowen commented on the issue:
https://github.com/apache/spark/pull/23216
Are you sure it's even a field in the class? it looks like it's only used
to define this:
```
@transient private[this] val preferredLocs: Seq[TaskLocation] = {
if (locs == null) Nil else locs.toSet.toSeq
}
```
I'd expect Scala would not generate a field. Indeed the thing it is used to
make is transient.
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