EnricoMi commented on code in PR #39754:
URL: https://github.com/apache/spark/pull/39754#discussion_r1455209994
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala:
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@@ -410,6 +410,20 @@ case class PrettyAttribute(
override def nullable: Boolean = true
}
+/**
+ * An expression that has to be resolved against a scope of resolved
attributes.
+ */
+case class ScopedExpression(child: Expression, scope: AttributeSeq)
Review Comment:
> shall we put Seq[Attribute]
yes, done:
```diff
-case class ScopedExpression(child: Expression, scope: AttributeSeq)
+case class ScopedExpression(child: Expression, scope: Seq[Attribute])
```
> include it as children?
as in
```diff
case class ScopedExpression(child: Expression, scope: Seq[Attribute])
- extends UnaryExpression with Unevaluable {
+ extends Expression with Unevaluable {
override def dataType: DataType = child.dataType
override def nullable: Boolean = child.nullable
override def prettyName: String = "scoped"
override def sql: String = s"$prettyName(${child.sql}, $scope)"
- override def withNewChildInternal(newChild: Expression): ScopedExpression
= copy(child = newChild)
+ override def withNewChildren(newChildren: Seq[Expression]):
ScopedExpression = {
+ val scope = newChildren.tail
+ assert(scope.forall(_.isInstanceOf[Attribute]), "Scope children have to
be attributes")
+ copy(child = newChildren.head, scope =
scope.map(_.asInstanceOf[Attribute]))
+ }
}
```
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