cloud-fan commented on code in PR #49386:
URL: https://github.com/apache/spark/pull/49386#discussion_r1909799001
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala:
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@@ -712,6 +717,109 @@ case class UnresolvedStarExceptOrReplace(
}
}
+/**
+ * Represents some of the input attributes to a given relational operator, for
example in
+ * `df.withColumn`.
+ *
+ * @param target an optional name that should be the target of the expansion.
If omitted all
+ * targets' columns are produced. This can only be a table name.
This
+ * is a list of identifiers that is the path of the expansion.
+ *
+ * @param colNames a list of column names that should be replaced or produced.
+ *
+ * @param exprs a list of expressions that should be used to replace the
expressions removed by.
+ *
+ * @param explicitMetadata an optional list of explicit metadata to associate
with the columns.
+ */
+case class UnresolvedStarWithColumns(
+ target: Option[Seq[String]],
+ colNames: Seq[String],
+ exprs: Seq[Expression],
+ explicitMetadata: Option[Seq[Metadata]] = None)
+ extends UnresolvedStarBase {
+
+ override def children: Seq[Expression] = exprs
+
+ override protected def withNewChildrenInternal(
+ newChildren: IndexedSeq[Expression]): UnresolvedStarWithColumns =
+ copy(exprs = newChildren)
+
+ override def expand(input: LogicalPlan, resolver: Resolver):
Seq[NamedExpression] = {
+ assert(colNames.size == exprs.size,
Review Comment:
This is a user-facing name, as these two lists are provided by users. Shall
we add a new error class for it?
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