Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15717#discussion_r91672523
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
---
@@ -217,6 +218,29 @@ abstract class ExternalCatalog {
predicates: Seq[Expression]): Seq[CatalogTablePartition]
//
--------------------------------------------------------------------------
+ // Columns
+ //
--------------------------------------------------------------------------
+
+ /**
+ * Alter one or more column(s)'s comment.
+ *
+ * Note: If the underlying implementation does not support altering a
certain field,
+ * this becomes a no-op.
+ * @param db database name
+ * @param table table name
+ * @param columnComments map from column names to comments
+ */
+ def alterColumnComments(db: String, table: String, columnComments:
Map[String, String]): Unit
+
+ /**
+ * List the metadata of all columns that are defined in the specified
table schema, assuming it
+ * exists.
+ * @param db database name
+ * @param table table name
+ */
+ def listColumns(db: String, table: String): Seq[StructField]
--- End diff --
does it worth to add a new API in `ExternalCatalog`?
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