Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21305#discussion_r206979097
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/WriteSupport.java ---
@@ -38,15 +38,16 @@
* If this method fails (by throwing an exception), the action will fail
and no Spark job will be
* submitted.
*
- * @param jobId A unique string for the writing job. It's possible that
there are many writing
- * jobs running at the same time, and the returned {@link
DataSourceWriter} can
- * use this job id to distinguish itself from other jobs.
+ * @param writeUUID A unique string for the writing job. It's possible
that there are many writing
+ * jobs running at the same time, and the returned
{@link DataSourceWriter} can
+ * use this job id to distinguish itself from other
jobs.
* @param schema the schema of the data to be written.
* @param mode the save mode which determines what to do when the data
are already in this data
* source, please refer to {@link SaveMode} for more details.
* @param options the options for the returned data source writer, which
is an immutable
* case-insensitive string-to-string map.
+ * @return a writer to append data to this data source
--- End diff --
The data source API only handles writes/appends and reads. The high-level
logical combine append writes with other operations.
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