kevinyu98 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_r390058450
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File path: docs/sql-ref-syntax-ddl-alter-table.md
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@@ -83,6 +82,110 @@ 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
+{% endhighlight %}
+
+#### Parameters
+<dl>
+ <dt><code><em>table_identifier</em></code></dt>
+ <dd>
+ Specifies a table name, which may be optionally qualified with a database
name.<br><br>
+ <b>Syntax:</b>
+ <code>
+ [ database_name. ] table_name
+ </code>
+ </dd>
+</dl>
+
+<dl>
+ <dt><code><em>COLUMN col_spec</em></code></dt>
+ <dd>Specifies the column to be altered or be changed.</dd>
+</dl>
+
+<dl>
+ <dt><code><em>alterColumnAction</em></code></dt>
+ <dd>
+ Change the comment string.<br><br>
+ <b>Syntax:</b>
+ <code>
+ COMMENT STRING
+ </code>
+ </dd>
+</dl>
+
+
+### ADD AND DROP PARTITION
+
+#### ADD PARTITION
+`ALTER TABLE ADD` statement adds partition to the partitioned table.
+
+##### Syntax
+{% highlight sql %}
+ALTER TABLE table_identifier ADD [IF NOT EXISTS]
+ PARTITION <partition_spec>
+ [ PARTITION <partition_spec> ...]
Review comment:
I will make changes. Thanks
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