sunjincheng121 commented on a change in pull request #8359:
[FLINK-11051][table] Add streaming window FlatAggregate to Table API
URL: https://github.com/apache/flink/pull/8359#discussion_r282715615
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File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/WindowGroupedTable.java
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@@ -54,4 +54,39 @@
* </pre>
*/
Table select(Expression... fields);
+
+ /**
+ * Performs a flatAggregate operation on a window grouped table.
FlatAggregate takes a
+ * TableAggregateFunction which returns multiple rows. Use a selection
after flatAggregate.
+ *
+ * <p>Example:
+ *
+ * <pre>
+ * {@code
+ * TableAggregateFunction tableAggFunc = new MyTableAggregateFunction
+ * tableEnv.registerFunction("tableAggFunc", tableAggFunc);
+ * windowGroupedTable
+ * .flatAggregate("tableAggFunc(a, b) as (x, y, z)")
+ * .select("key, window.start, x, y, z")
+ * }
+ * </pre>
+ */
+ FlatAggregateTable flatAggregate(String tableAggregateFunction);
Review comment:
We should add the JavaDoc for `WindowGroupedTable` in `FlatAggregateTable`.
e.g.:
A table that performs flatAggregate on a {@link Table}, a {@link
GroupedTable} or a {@link WndowGroupedTable}.
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