Yaohua628 commented on a change in pull request #35459:
URL: https://github.com/apache/spark/pull/35459#discussion_r803380309
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
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@@ -451,3 +451,28 @@ object MetadataAttribute {
} else None
}
}
+
+/**
+ * The internal representation of the FileSourceMetadataAttribute, it sets
`__metadata_col`
+ * and `__file_source_metadata_col` to `true` in AttributeReference's metadata
+ * - apply() will create a file source metadata attribute reference
+ * - unapply() will check if an attribute reference is the file source
metadata attribute reference
+ */
+object FileSourceMetadataAttribute {
Review comment:
still keep the `METADATA_COL_ATTR_KEY` in `FileSourceMetadataAttribute`:
`FileSourceMetadataAttribute` <= `MetadataAttribute`
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