cloud-fan commented on a change in pull request #35459:
URL: https://github.com/apache/spark/pull/35459#discussion_r802661193
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
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@@ -437,16 +437,20 @@ object VirtualColumn {
* The internal representation of the hidden metadata struct:
* set `__metadata_col` to `true` in AttributeReference metadata
* - apply() will create a metadata attribute reference
- * - unapply() will check if an attribute reference is the metadata attribute
reference
+ * - unapply() will check if an attribute reference is the file source
metadata attribute reference
*/
object MetadataAttribute {
Review comment:
Or we make sure that we only call `MetadataAttribute.unapply` in places
that only deal with file sources.
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