zhztheplayer commented on code in PR #7620:
URL: https://github.com/apache/incubator-gluten/pull/7620#discussion_r1809983607
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backends-velox/src/main/scala/org/apache/gluten/backendsapi/velox/VeloxValidatorApi.scala:
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@@ -91,6 +91,10 @@ class VeloxValidatorApi extends ValidatorApi {
override def doColumnarShuffleExchangeExecValidate(
outputPartitioning: Partitioning,
child: SparkPlan): Option[String] = {
+ if (child.output.isEmpty) {
+ // See: https://github.com/apache/incubator-gluten/issues/7600.
+ return Some("Shuffle with empty schema is not supported")
+ }
Review Comment:
Empty schema batches should pass through shuffle so that they can be handled
in reducer-side operators within the row number information they carried on.
cc @marin-ma
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