Github user maryannxue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21720#discussion_r201164582
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/basicLogicalOperators.scala
---
@@ -700,7 +700,7 @@ case class GroupingSets(
case class Pivot(
groupByExprsOpt: Option[Seq[NamedExpression]],
pivotColumn: Expression,
--- End diff --
No. Pivot column is one "expression" which can be either 1) a single column
reference or 2) a struct of multiple columns. Either way the list of pivot
values are many-to-one mapping for the pivot column.
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