Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/9343#discussion_r43586989
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -166,26 +168,55 @@ abstract class Star extends LeafExpression with
NamedExpression {
* Represents all of the input attributes to a given relational operator,
for example in
* "SELECT * FROM ...".
*
- * @param table an optional table that should be the target of the
expansion. If omitted all
- * tables' columns are produced.
+ * This is also used to expand structs. For example:
+ * "SELECT record.* from (SELCCT struct(a,b,c) as record ...)
+ *
+ * @param target an optional name that should be the target of the
expansion. If omitted all
+ * targets' columns are produced. This can either be a table
name or struct name.
*/
-case class UnresolvedStar(table: Option[String]) extends Star with
Unevaluable {
+case class UnresolvedStar(target: Option[String]) extends Star with
Unevaluable {
--- End diff --
btw, do we support `db.table.*` or `db.table.struct.*`?
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