kevinyu98 commented on a change in pull request #25573:
[SPARK-28833][DOCS][SQL] Document ALTER VIEW command
URL: https://github.com/apache/spark/pull/25573#discussion_r345923078
##########
File path: docs/sql-ref-syntax-ddl-alter-view.md
##########
@@ -19,4 +19,222 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+
+The `ALTER VIEW` statement can alter metadata associated with the view. It can
change the definition of the view, change
+the name of a view to a different name, set and unset the metadata of the view
by setting `TBLPROPERTIES`.
+
+#### RENAME View
+Renames the existing view. If the new view name already exists in the source
database, a `TableAlreadyExistsException` is thrown. This operation
+does not support moving the views across databases.
+
+#### Syntax
+{% highlight sql %}
+ALTER VIEW view_identifier RENAME TO view_identifier
+{% endhighlight %}
+
+#### Parameters
+<dl>
+ <dt><code><em>view_identifier</em></code></dt>
+ <dd>
+ Specifies a view name, which may be optionally qualified with a database
name.<br><br>
+ <b> Syntax:</b>
+ <code>
+ [database_name.]view_name
+ </code>
+ </dd>
+</dl>
+
+#### SET View Properties
+Set one or more properties of an existing view. The properties are the key
value pairs. If the properties' keys exist,
+the values are replaced with the new values. If the properties' keys do not
exist, the key value pairs are added into
+the properties.
+
+#### Syntax
+{% highlight sql %}
+ALTER VIEW view_identifier SET TBLPROPERTIES
+ (property_key=property_val [, ...])
+{% endhighlight %}
+
+#### Parameters
+<dl>
+ <dt><code><em>view_identifier</em></code></dt>
+ <dd>
+ Specifies a view name, which may be optionally qualified with a database
name.<br><br>
+ <b> Syntax:</b>
+ <code>
+ [database_name.]view_name
+ </code>
+ </dd>
+ <dt><code><em>property_key</em></code></dt>
+ <dd>
+ Specifies the property key. The key may consists of multiple parts
separated by dot.<br><br>
+ <b>Syntax:</b>
+ <code>
+ [key_part1][.key_part2][...]
+ </code>
+ </dd>
+</dl>
+
+#### UNSET View Properties
+Drop one or more properties of an existing view. If the specified keys do not
exist, an exception is thrown. Use
+`IF EXISTS` to avoid the exception.
+
+#### Syntax
+{% highlight sql %}
+ALTER VIEW view_identifier UNSET TBLPROPERTIES [IF EXISTS]
+ (property_key [, ...])
+{% endhighlight %}
+
+#### Parameters
+<dl>
+ <dt><code><em>view_identifier</em></code></dt>
+ <dd>
+ Specifies a view name, which may be optionally qualified with a database
name.<br><br>
+ <b> Syntax:</b>
+ <code>
+ [database_name.]view_name
+ </code>
+ </dd>
+ <dt><code><em>property_key</em></code></dt>
+ <dd>
+ Specifies the property key. The key may consists of multiple parts
separated by dot.<br><br>
+ <b>Syntax:</b>
+ <code>
+ [key_part1][.key_part2][...]
+ </code>
+ </dd>
+</dl>
+
+#### ALTER View AS SELECT
+`ALTER VIEW view_identifier AS SELECT` statement changes the definition of a
view, the `SELECT` statement must be valid,
+and the `view_identifier` must exist.
+
+#### Syntax
+{% highlight sql %}
+ALTER VIEW view_identifier AS select_statement
+{% endhighlight %}
+
+#### Parameters
+<dl>
+ <dt><code><em>view_identifier</em></code></dt>
+ <dd>
+ Specifies a view name, which may be optionally qualified with a database
name.<br><br>
+ <b> Syntax:</b>
+ <code>
+ [database_name.]view_name
+ </code>
+ </dd>
+ <dt><code><em>select_statement</em></code></dt>
+ <dd>
+ Specifies the definition of the view, detail check
[select_statement](sql-ref-syntax-qry-select.html)
Review comment:
@huaxingao thanks, let me change.
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