Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5526#discussion_r28452935
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -197,3 +233,69 @@ trait InsertableRelation {
trait CatalystScan {
def buildScan(requiredColumns: Seq[Attribute], filters:
Seq[Expression]): RDD[Row]
}
+
+/**
+ * ::Experimental::
+ * [[OutputWriter]] is used together with [[FSBasedRelation]] for
persisting rows to the
+ * underlying file system. An [[OutputWriter]] instance is created when a
new output file is
+ * opened. This instance is used to persist rows to this single output
file.
+ */
+@Experimental
+trait OutputWriter {
--- End diff --
this should be an abstract class also
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