Github user mpjlu commented on the issue:
https://github.com/apache/spark/pull/18620
I have tested much about poll and toArray.sorted.
If the queue is much ordered (suppose offer 2000 times for queue size 20).
Use pq.toArray.sorted is faster.
If the queue is much disordered (suppose offer 100 times for queue size
20), Use pq.poll is much faster.
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