dianfu commented on a change in pull request #7235: [FLINK-10976] [table] Add 
support for aggregate to table API
URL: https://github.com/apache/flink/pull/7235#discussion_r241302590
 
 

 ##########
 File path: docs/dev/table/tableApi.md
 ##########
 @@ -1682,6 +1682,36 @@ The `OverWindow` defines a range of rows over which 
aggregates are computed. `Ov
 
 {% top %}
 
+### Aggregate
+
+Aggregate performs an aggregate operation with an aggregate function. You have 
to close the
+"aggregate" with a select statement. The output will be flattened if the 
output type is a
+composite type.
+
+<div class="codetabs" markdown="1">
+<div data-lang="java" markdown="1">
+{% highlight java %}
+tableEnv.registerFunction("myAggFunc", new MyAggregateFunction());
 
 Review comment:
   Done

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