Github user arunmahadevan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21560#discussion_r197523482
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/UnsupportedOperationChecker.scala
---
@@ -349,6 +349,17 @@ object UnsupportedOperationChecker {
_: DeserializeToObject | _: SerializeFromObject | _:
SubqueryAlias |
_: TypedFilter) =>
case node if node.nodeName == "StreamingRelationV2" =>
+ case Repartition(1, false, _) =>
+ case node: Aggregate =>
+ val aboveSinglePartitionCoalesce = node.find {
+ case Repartition(1, false, _) => true
+ case _ => false
+ }.isDefined
+
+ if (!aboveSinglePartitionCoalesce) {
--- End diff --
Also if theres a single parent partition and theres a `Repartition(1)` that
node should probably be removed. Not sure if this is already being done.
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