Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/16758#discussion_r99748711
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala
---
@@ -235,3 +234,79 @@ case class StateStoreSaveExec(
override def outputPartitioning: Partitioning = child.outputPartitioning
}
+
+
+/** Physical operator for executing streaming mapGroupsWithState. */
+case class MapGroupsWithStateExec(
+ func: (Any, Iterator[Any], LogicalKeyedState[Any]) => Iterator[Any],
+ keyDeserializer: Expression,
+ valueDeserializer: Expression,
+ groupingAttributes: Seq[Attribute],
+ dataAttributes: Seq[Attribute],
+ outputObjAttr: Attribute,
+ stateId: Option[OperatorStateId],
+ stateDeserializer: Expression,
+ stateSerializer: Seq[NamedExpression],
+ child: SparkPlan) extends UnaryExecNode with ObjectProducerExec with
StateStoreWriter {
+
+ override def outputPartitioning: Partitioning = child.outputPartitioning
+
+ /** Distribute by grouping attributes */
+ override def requiredChildDistribution: Seq[Distribution] =
+ ClusteredDistribution(groupingAttributes) :: Nil
+
+ /** Ordering needed for using GroupingIterator */
+ override def requiredChildOrdering: Seq[Seq[SortOrder]] =
+ Seq(groupingAttributes.map(SortOrder(_, Ascending)))
+
+ override protected def doExecute(): RDD[InternalRow] = {
+ child.execute().mapPartitionsWithStateStore[InternalRow](
+ getStateId.checkpointLocation,
+ operatorId = getStateId.operatorId,
+ storeVersion = getStateId.batchId,
+ groupingAttributes.toStructType,
+ child.output.toStructType,
+ sqlContext.sessionState,
+ Some(sqlContext.streams.stateStoreCoordinator)) { (store, iter) =>
+ val numTotalStateRows = longMetric("numTotalStateRows")
+ val numUpdatedStateRows = longMetric("numUpdatedStateRows")
+ val numOutputRows = longMetric("numOutputRows")
+
+ val groupedIter = GroupedIterator(iter, groupingAttributes,
child.output)
+
+ val getKeyObj =
ObjectOperator.deserializeRowToObject(keyDeserializer, groupingAttributes)
+ val getKey = GenerateUnsafeProjection.generate(groupingAttributes,
child.output)
--- End diff --
done.
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