dilipbiswal commented on a change in pull request #25553: [SPARK-28797][DOC]
Document DROP FUNCTION statement in SQL Reference.
URL: https://github.com/apache/spark/pull/25553#discussion_r316962338
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File path: docs/sql-ref-syntax-ddl-drop-function.md
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@@ -19,4 +19,31 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+Dropping a user-defined function(UDF). An exception will be thrown if the
function does not exist
+ in the system.
+
+### Syntax
+{% highlight sql %}
+DROP [TEMPORARY] FUNCTION [IF EXISTS] [db_name.]function_name;
+{% endhighlight %}
+
+### Example
+{% highlight sql %}
+DROP TEMPORARY FUNCTION tempfunction;
+DROP FUNCTION testdb.permfunction;
+{% endhighlight %}
+
+### Parameters
+
+### **function_name**
+
+The name of an existing function.
+
+### **TEMPORARY**
+
+If specified, the function created will be local to session. On close of
session it will be removed.
+
+### **IF EXISTS**
+
+If specified will not throw any exception if no function exists.
Review comment:
How about -
"If specified, no exception is thrown when the function does not exist"
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