Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/15717#discussion_r91672371 --- 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 --- End diff -- can we just reuse `alterTable`?
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