beliefer commented on code in PR #39091:
URL: https://github.com/apache/spark/pull/39091#discussion_r1055999303


##########
connector/connect/server/src/main/scala/org/apache/spark/sql/connect/planner/SparkConnectPlanner.scala:
##########
@@ -372,6 +374,22 @@ class SparkConnectPlanner(session: SparkSession) {
     }
   }
 
+  private def transformCollectMetrics(rel: proto.CollectMetrics): LogicalPlan 
= {
+    val metrics = rel.getMetricsList.asScala.toSeq.map { expr =>
+      Column(transformExpression(expr))
+    }
+
+    if (rel.getIsObservation) {
+      val observation = Observation(rel.getName)
+      Dataset
+        .ofRows(session, transformRelation(rel.getInput))
+        .observe(observation, metrics.head, metrics.tail: _*)
+        .logicalPlan
+    } else {
+      CollectMetrics(rel.getName, metrics.map(_.named), 
transformRelation(rel.getInput))

Review Comment:
   @hvanhovell I'm sorry. I also supports `df.randomSplits`. The reply just now 
is confused. `df.observe` without cache behavior. We can only support string 
now.



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