Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19649#discussion_r149086543
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/events.scala
---
@@ -110,7 +120,27 @@ 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
--- End diff --
Maybe we can have one event for all `alterTableXXX`, and add one more
parameter to indicate which part of the table is altered.
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