Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/19649#discussion_r148781384
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/events.scala
---
@@ -110,7 +122,27 @@ case class RenameTableEvent(
extends TableEvent
/**
- * Event fired when a function is created, dropped or renamed.
+ * Event fired before a table is altered.
+ */
+case class AlterTablePreEvent(database: String, name: String) extends
TableEvent
+
+/**
+ * Event fired after a table is altered.
+ */
+case class AlterTableEvent(database: String, name: String) extends
TableEvent
+
+/**
+ * Event fired before table schema is altered.
+ */
+case class AlterTableSchemaPreEvent(database: String, name: String)
extends TableEvent
--- End diff --
Do we need a separate event for alter schema?
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