zhengruifeng commented on code in PR #47884:
URL: https://github.com/apache/spark/pull/47884#discussion_r1738089068
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala:
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@@ -974,3 +974,13 @@ case object UnresolvedWithinGroup extends LeafExpression
with Unevaluable {
override def dataType: DataType = throw new UnresolvedException("dataType")
override lazy val resolved = false
}
+
+case class UnresolvedTranspose(
+ indexColumn: Option[Expression],
Review Comment:
shall we make it a `indices: Seq[Expression]`?
currently we only support
1, `len(indices) == 0` => no specified index;
2, `len(indices) == 1` => a specified index;
by assert(len(indices)) == 0 or 1.
Then this parameter could support multi-level indices if needed in the future
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