maropu commented on a change in pull request #26847: [SPARK-30214][SQL] Support
COMMENT ON syntax
URL: https://github.com/apache/spark/pull/26847#discussion_r356542741
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2Commands.scala
##########
@@ -454,3 +454,14 @@ case class ShowTableProperties(
AttributeReference("key", StringType, nullable = false)(),
AttributeReference("value", StringType, nullable = false)())
}
+
+/**
+ * The logical plan of the COMMENT ON (DATABASE|SCHEMA|NAMESPACE) ... IS ...
command that works for
+ * v2 catalogs.
+ */
+case class CommentOnNamespace(namespace: Seq[String], comment: String) extends
Command
Review comment:
Can you leave some comments about NULL? just like `NULL to drop the comment`;
https://www.postgresql.org/docs/12/sql-comment.html
```
// From the PgSQL document:
text
The new comment, written as a string literal; or NULL to drop the comment.
```
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