aokolnychyi commented on a change in pull request #3992:
URL: https://github.com/apache/iceberg/pull/3992#discussion_r793984876
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File path:
spark/v3.2/spark-extensions/src/main/scala/org/apache/spark/sql/execution/datasources/v2/MergeRowsExec.scala
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@@ -46,6 +48,15 @@ case class MergeRowsExec(
output: Seq[Attribute],
child: SparkPlan) extends UnaryExecNode {
+ override def requiredChildOrdering: Seq[Seq[SortOrder]] = {
+ if (performCardinalityCheck) {
+ // request a local sort by the row ID attrs to co-locate matches for the
same target row
+ Seq(rowIdAttrs.map(attr => SortOrder(attr, Ascending)))
Review comment:
Instead of requesting a sort, we could keep track of all seen row IDs in
a task (we keep only the last one right now). That will potentially require
more memory.
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