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
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File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
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@@ -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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