EnricoMi commented on code in PR #37407:
URL: https://github.com/apache/spark/pull/37407#discussion_r982515423
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala:
##########
@@ -1098,6 +1106,87 @@ class AstBuilder extends
SqlBaseParserBaseVisitor[AnyRef] with SQLConfHelper wit
}
}
+ /**
+ * Add an [[Unpivot]] to a logical plan.
+ */
+ private def withUnpivot(
+ ctx: UnpivotClauseContext,
+ query: LogicalPlan): LogicalPlan = withOrigin(ctx) {
+ // this is needed to create unpivot and to filter unpivot for nulls
further down
+ val valueColumnNames =
+ Option(ctx.unpivotOperator().unpivotSingleValueColumnClause())
+ .map(_.unpivotValueColumn().identifier().getText)
+ .map(Seq(_))
+ .getOrElse(
+ Option(ctx.unpivotOperator().unpivotMultiValueColumnClause())
+ .map(_.unpivotValueColumns.asScala.map(_.identifier().getText).toSeq)
+ .get
+ )
+
+ val unpivot = if (ctx.unpivotOperator().unpivotSingleValueColumnClause()
!= null) {
+ val unpivotClause =
ctx.unpivotOperator().unpivotSingleValueColumnClause()
+ val variableColumnName =
unpivotClause.unpivotNameColumn().identifier().getText
+ val unpivotColumns =
unpivotClause.unpivotColumns.asScala.map(visitUnpivotColumn).toSeq
+
+ Unpivot(
+ None,
+ Some(unpivotColumns.map(Seq(_))),
Review Comment:
I am not sure what we want to support here:
```
SELECT *
FROM a.b
UNPIVOT (
val for col in (c)
)
```
when `a` is a database and `b` is a table.
```
SELECT *
FROM a.b.*
UNPIVOT (
val for col in (c)
)
```
when `a` is a table and `b` is a struct.
In either way, `c` is an `AttributeReference`, right?
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