Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/17289
```Scala
test("saveAsTable API with SaveMode.Overwrite") {
val df = spark.createDataFrame(sparkContext.parallelize(arr1x2),
schema2)
spark.read.jdbc(url1, "test.people", properties).show()
df.write.format("jdbc").mode(SaveMode.ErrorIfExists)
.option("url", url1)
.option("dbtable", "test.people")
.options(properties.asScala)
.saveAsTable("j1")
spark.read.jdbc(url1, "test.people", properties).show()
}
```
This is a test case I used. Previously, we respected the user-specified
mode `SaveMode.ErrorIfExists`. Now, we are not sending the[ mode to the
_createRelation_ API
](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala#L181).
It might be an unexpected behavior change to the external data source
connector.
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