Github user frreiss commented on a diff in the pull request:
https://github.com/apache/spark/pull/14691#discussion_r76505064
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamWriter.scala
---
@@ -123,12 +124,30 @@ final class DataStreamWriter[T] private[sql](ds:
Dataset[T]) {
/**
* :: Experimental ::
* Specifies the underlying output data source. Built-in options include
"parquet", "json", etc.
+ * Additionally user specific StreamSinkProviders can be specified hear
using the fully qualified
+ * class name.
*
* @since 2.0.0
*/
@Experimental
def format(source: String): DataStreamWriter[T] = {
this.source = source
+ this.sinkProvider = null
+ this
+ }
+
+ /**
+ * :: Experimental ::
+ * Specifies the underlying output data source using a
StreamSinkProvider. This is useful for
+ * sinks which are constructed with user specified functions (such as a
user specified version of
+ * ForeachSink).
+ *
+ * @since 2.1.0
+ */
+ @Experimental
+ def format(sinkProvider: StreamSinkProvider): DataStreamWriter[T] = {
+ this.source = null
--- End diff --
Probably better to set `source` to a dedicated constant string like
"custom" here, so that the branches in start() all have consistent logic.
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