[GitHub] [spark] huaxingao commented on a change in pull request #28120: [SPARK-31349][SQL][DOCS] Sql ref buildin-aggregate

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huaxingao commented on a change in pull request #28120: [SPARK-31349][SQL][DOCS] Sql ref buildin-aggregate
URL: https://github.com/apache/spark/pull/28120#discussion_r403644510
 
 

 ##########
 File path: docs/sql-ref-functions-builtin-aggregate.md
 ##########
 @@ -19,4 +19,626 @@ license: |
   limitations under the License.
 ---
 
-Aggregate functions
\ No newline at end of file
+Spark SQL provides build-in Aggregate functions defines in dataset API and SQL interface. Aggregate functions
+operate on a group of rows and return a single value.
+
+Spark SQL Aggregate functions are grouped as <code>agg_funcs</code> in spark SQL. Below is the list of functions.
+
+**Note:** Every below function has another signature which take String as a column name instead of Column.
+
+* Table of contents
+{:toc}
+<table class="table">
+  <thead>
+    <tr><th style="width:25%">Function</th><th>Parameters</th><th>Description</th></tr>
+  </thead>
+  <tbody>
+    <tr>
+      <td> <b>{avg | mean}</b>(<i>e: Column</i>)</td>
 
 Review comment:
   Could you list the functions in alphabetical order?

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