Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10312#discussion_r47760673
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -265,10 +266,22 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
* @param connectionProperties JDBC database connection arguments, a
list of arbitrary string
* tag/value. Normally at least a "user" and
"password" property
* should be included.
+ * @param columnMapping Maps DataFrame column names to target table
column names.
+ * This parameter can be omitted if the target
table has/will be
--- End diff --
It's the `immutable` that is not necessary.
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