Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18185#discussion_r129943216
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/unresolved.scala
---
@@ -423,6 +423,26 @@ case class UnresolvedAlias(
}
/**
+ * Aliased column names for subquery. We could add alias names for output
columns in the subquery:
+ * {{{
+ * // Assign alias names for output columns
+ * SELECT col1, col2 FROM testData AS t(col1, col2);
+ * }}}
+ *
+ * @param outputColumnNames the column names for this subquery.
+ * @param child the logical plan of this subquery.
+ */
+case class UnresolvedSubqueryColumnAlias(
--- End diff --
Nit: `UnresolvedSubqueryColumnAlias ` -> `UnresolvedSubqueryColumnAliases`
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