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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2019/05/05 02:26:42 UTC

[GitHub] [flink] dianfu commented on a change in pull request #8311: [FLINK-10976][table] Add Aggregate operator to Table API

dianfu commented on a change in pull request #8311: [FLINK-10976][table] Add Aggregate operator to Table API
URL: https://github.com/apache/flink/pull/8311#discussion_r281000356
 
 

 ##########
 File path: flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
 ##########
 @@ -1058,4 +1058,39 @@
 	 * </pre>
 	 */
 	Table flatMap(Expression tableFunction);
+
+	/**
+	 * Performs a global aggregate operation with an aggregate function. Use this before a selection
+	 * to perform the selection operation. The output will be flattened if the output type is a
+	 * composite type.
+	 *
+	 * <p>Example:
+	 *
+	 * <pre>
+	 * {@code
+	 *   AggregateFunction aggFunc = new MyAggregateFunction()
+	 *   tableEnv.registerFunction("aggFunc", aggFunc);
+	 *   table.aggregate("aggFunc(a, b) as (f0, f1, f2)")
+	 *     .select("key, f0, f1")
 
 Review comment:
   select("f0, f1")?

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