maropu commented on a change in pull request #27779:
[SPARK-30962][SQL][DOC]Documentation for Alter table command phase 2
URL: https://github.com/apache/spark/pull/27779#discussion_r389349609
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File path: docs/sql-ref-syntax-ddl-alter-table.md
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@@ -83,6 +82,108 @@ ALTER TABLE table_identifier ADD COLUMNS ( col_spec [ ,
col_spec ... ] )
</dl>
+### ALTER OR CHANGE COLUMN
+`ALTER TABLE ALTER COLUMN` or `ALTER TABLE CHANGE COLUMN` statement changes
column's comment.
+
+#### Syntax
+{% highlight sql %}
+ALTER TABLE table_identifier { ALTER | CHANGE } COLUMN col_spec
alterColumnAction
Review comment:
`COLUMN` is optional?
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