Github user imatiach-msft commented on the issue:
https://github.com/apache/spark/pull/22328
"specify numPartitions (it will be determined by datasource automatically)"
This feature was because of this bug:
https://issues.apache.org/jira/browse/SPARK-22357
Which was just fixed a week ago in spark 2.4.0.
It can be removed, even in the current API.
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