srowen 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_r344774890
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File path: docs/sql-ref-syntax-ddl-alter-view.md
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@@ -19,4 +19,217 @@ 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 view name already exists in the source
database, a TableAlreadyExistsException is thrown. This operation
+does not support moving the views cross 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>
+
+#### Drop VIEW properties
Review comment:
"Drop" doesn't seem like the right word if the keyword is UNSET?
"Unset View Properties" or "UNSET View Properties"? I'd all-caps only the
words that are SQL keywords.
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