Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/17219#discussion_r107045633
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/streaming/Trigger.scala ---
@@ -38,6 +38,51 @@ sealed trait Trigger
/**
* :: Experimental ::
+ * A trigger that runs a query once then terminates
+ *
+ * Scala Example:
+ * {{{
+ * df.write.trigger(OneTime)
+ * }}}
+ *
+ * Java Example:
+ * {{{
+ * df.write.trigger(OneTime.create())
+ * }}}
+ *
+ * @since 2.2.0
+ */
+@Experimental
+@InterfaceStability.Evolving
+case class OneTime() extends Trigger
+
+/**
+ * :: Experimental ::
+ * Used to create [[OneTime]] triggers for [[StreamingQuery]]s.
--- End diff --
The explanation of OneTime trigger is given in the OneTime class
definition. Does that suffice, or should the explanation be reiterated in the
object definition?
If it should be reiterated, then I can do the same with ProcessingTime.
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