gatorsmile commented on a change in pull request #25539:
[SPARK-28808][DOCS][SQL] Document SHOW FUNCTIONS in SQL Reference.
URL: https://github.com/apache/spark/pull/25539#discussion_r317460486
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File path: docs/sql-ref-syntax-aux-show-functions.md
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@@ -19,4 +19,47 @@ license: |
limitations under the License.
---
-**This page is under construction**
+### Description
+Returns the list of functions after applying an optional regex pattern.
+Three optional parameters `SYSTEM`, `USER`, `ALL` may be specified to list
+system functions, user defined function or both user and system defined
+funtions respectively. Given Spark supports hundreds of functions, this
+statement in conjuction with [describe
function](sql-ref-syntax-aux-describe-function.html)
+may be used to quickly find the function and understand its usage.
+
+### Syntax
+{% highlight sql %}
+SHOW [USER|SYSTEM|ALL] FUNCTIONS ([LIKE] qualified_function_name |
regex_pattern)
+qualified_function_name:= [db.]function_name
Review comment:
Is this still needed? How about only doing it in the section `###
Parameters`?
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