Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/7478#discussion_r34944170
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala
---
@@ -212,6 +212,25 @@ abstract class LogicalPlan extends
QueryPlan[LogicalPlan] with Logging {
}
}
+ /**
+ * Resolves the given `name` string against any known virtual columns,
returning either
+ * 0 or 1 match
+ *
+ * Every supported virtual column needs to add a check here so that the
logical plan can
+ * resolve it.
+ */
+ private def resolveAsVirtualColumn(
+ nameParts: Seq[String],
+ resolver: Resolver,
+ attribute: Attribute): Option[(Attribute, List[String])] = {
--- End diff --
Since it is a virtual column, you do not need `attribute`, right?
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