cloud-fan commented on code in PR #42577:
URL: https://github.com/apache/spark/pull/42577#discussion_r1382781093
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala:
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@@ -170,6 +170,23 @@ case class CatalogTablePartition(
}
}
+/**
+ * A container for clustering information.
+ *
+ * @param columnNames the names of the columns used for clustering.
+ */
+case class ClusterBySpec(columnNames: Seq[UnresolvedAttribute]) {
+ override def toString: String = columnNames.map(_.name).mkString(",")
+
+ lazy val toDDL: String = if (columnNames.nonEmpty) s"CLUSTER BY ($toString)"
else ""
+}
+
+object ClusterBySpec {
+ def apply(columns: String): ClusterBySpec = columns match {
Review Comment:
this looks weird, where do we use it?
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