Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/11050#discussion_r52096964
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
---
@@ -114,16 +117,21 @@ abstract class Attribute extends LeafExpression with
NamedExpression {
* Note that exprId and qualifiers are in a separate parameter list because
* we only pattern match on child and name.
*
- * @param child the computation being performed
- * @param name the name to be associated with the result of computing
[[child]].
+ * @param child The computation being performed
+ * @param name The name to be associated with the result of computing
[[child]].
* @param exprId A globally unique id used to check if an
[[AttributeReference]] refers to this
* alias. Auto-assigned if left blank.
+ * @param qualifiers A list of strings that can be used to referred to
this attribute in a fully
+ * qualified way. Consider the examples tableName.name,
subQueryAlias.name.
+ * tableName and subQueryAlias are possible qualifiers.
* @param explicitMetadata Explicit metadata associated with this alias
that overwrites child's.
+ * @param isGenerated A flag to indicate if this alias is generated by
Catalyst
*/
case class Alias(child: Expression, name: String)(
val exprId: ExprId = NamedExpression.newExprId,
val qualifiers: Seq[String] = Nil,
- val explicitMetadata: Option[Metadata] = None)
+ val explicitMetadata: Option[Metadata] = None,
+ override val isGenerated: Option[Boolean] = None)
--- End diff --
Thank you, will make a change.
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