brkyvz commented on a change in pull request #24937: [SPARK-28139][SQL] Add v2 
ALTER TABLE implementation.
URL: https://github.com/apache/spark/pull/24937#discussion_r302681505
 
 

 ##########
 File path: 
sql/catalyst/src/main/java/org/apache/spark/sql/catalog/v2/TableChange.java
 ##########
 @@ -227,14 +227,18 @@ public String property() {
     }
   }
 
+  interface ColumnChange extends TableChange {
 
 Review comment:
   Could you add docs for this please?

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