Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/13342#discussion_r66533244
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala ---
@@ -401,6 +381,53 @@ 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("foreach")
+ assertStreaming(
+ "foreach() on streaming Datasets and DataFrames can only be called
on continuous queries")
--- End diff --
foreach() can only be called on streaming Datasets/DataFrames.
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