Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/13342#discussion_r65412780
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -401,6 +381,52 @@ final class DataFrameWriter private[sql](df:
DataFrame) {
}
/**
+ * :: Experimental ::
+ * Starts the execution of the streaming query, which will continually
send results to the given
+ * [[ForeachWriter]] as new data arrives. The returned
[[ContinuousQuery]] object can be used to
+ * interact with the stream.
+ *
+ * @since 2.0.0
+ */
+ @Experimental
+ def foreach(writer: ForeachWriter[T]): ContinuousQuery = {
+ assertNotBucketed()
+ assertStreaming("startStream() can only be called on continuous
queries")
+
+ val queryName = extraOptions.getOrElse("queryName",
StreamExecution.nextName)
+ val sink = new
ForeachSink[T](ds.sparkSession.sparkContext.clean(writer))(ds.unresolvedTEncoder)
+ df.sparkSession.sessionState.continuousQueryManager.startQuery(
+ queryName,
+ getCheckpointLocation(queryName, required = false),
+ df,
+ sink,
+ outputMode,
+ trigger)
+ }
+
+ /**
+ * Returns the checkpointLocation for a query. If `required` is `ture`
but the checkpoint
--- End diff --
`true`
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