Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/8710#issuecomment-140203217
> If there is no execution id in the local properties when creating a child
thread and we change it to clone the properties, then the child thread won't
see the execution id that is set by the parent thread.
Ah, I see. You're saying the child thread must be created *before* the
query is run, not while it's running. That makes sense. Previously I accounted
for the case where the child thread is created in the middle of the query,
which I suppose is not possible. I have updated the code based on your
suggestion.
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