Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/15868
For document, may I add more description about the behavior to help the
user understanding?
**BEFORE**
> The number of JDBC connections, which specifies the maximum number of
simultaneous JDBC connections that are allowed. This option applies only to
writing. It defaults to the number of partitions of RDD.
**AFTER**
> The number of JDBC connections, which specifies the maximum number of
simultaneous JDBC connections that are allowed. This option applies only **to
writing with additional `coalesce` operation**. It defaults to the number of
partitions of RDD.
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