Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15868
My fault. In my initial thoughts, `numPartitions` does not indicate the max
allowed number of JDBC connections, and the write path does not always create
the exact number of partitions. We only change the num of partitions if the
number is larger than the threshold.
I do not have a strong opinon on either way.
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