viirya commented on a change in pull request #32303:
URL: https://github.com/apache/spark/pull/32303#discussion_r619571998
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
##########
@@ -392,16 +392,27 @@ case class UnresolvedStar(target: Option[Seq[String]])
extends Star with Unevalu
throw
QueryCompilationErrors.starExpandDataTypeNotSupportedError(target.get)
}
} else {
- val from = input.inputSet.map(_.name).mkString(", ")
- val targetString = target.get.mkString(".")
- throw
QueryCompilationErrors.cannotResolveStarExpandGivenInputColumnsError(
- targetString, from)
+ // Change the unresolved star to an expanded star to indicate the star
has been
+ // expanded once.
+ ExpandedStar(this) :: Nil
}
}
override def toString: String = target.map(_ + ".").getOrElse("") + "*"
}
+/**
+ * Represent an [[UnresolvedStar]] that has been to expand once.
Review comment:
`has been to expand once` sounds uncertain definition to me. By its
definition, cannot it be expanded more than once?
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