Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17289
We introduced a behavior change in Spark 2.2. In Spark 2.1, we reported an
error if the underlying JDBC table exists. We changed [the mode to
`SaveMode.Overwrite`](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala#L159)
if the table does not exist in the catalog.
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