Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/21733#discussion_r208483242
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/package.scala
---
@@ -81,4 +85,221 @@ package object state {
storeCoordinator)
}
}
+
+ /**
+ * Base trait for state manager purposed to be used from streaming
aggregations.
+ */
+ sealed trait StreamingAggregationStateManager extends Serializable {
+
+ /**
+ * Extract columns consisting key from input row, and return the new
row for key columns.
+ *
+ * @param row The input row.
+ * @return The row instance which only contains key columns.
--- End diff --
nit: a lot of the `@param` and `@return` in the docs are a bit superfluous
as it just repeats what the main statement already says.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
