Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18266#discussion_r137720936
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala ---
@@ -197,7 +197,7 @@ class DataFrameReader private[sql](sparkSession:
SparkSession) extends Logging {
* @since 1.4.0
*/
def jdbc(url: String, table: String, properties: Properties): DataFrame
= {
- assertNoSpecifiedSchema("jdbc")
+ assertJdbcAPISpecifiedDataFrameSchema()
--- End diff --
Users should be able to do it in either way. If users specify them in both
`schema()` API and the `customerSchema` option, we should issue an exception.
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