sunjincheng121 commented on a change in pull request #7196: [FLINK-10974]
[table] Add support for flatMap to table API
URL: https://github.com/apache/flink/pull/7196#discussion_r276914756
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
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@@ -1019,10 +1020,40 @@
* <p>Scala Example:
*
* <pre>
- * {@code val func = new MyMapFunction()
+ * {@code
+ * val func = new MyMapFunction()
* tab.map(func('c))
* }
* </pre>
*/
Table map(Expression mapFunction);
+
+ /**
+ * Performs a flatMap operation with a table function.
+ *
+ * <p>Example:
+ *
+ * <pre>
+ * {@code
+ * TableFunction func = new MyFlatMapFunction();
+ * tableEnv.registerFunction("func", func);
+ * table.flatMap("func(c)");
+ * }
+ * </pre>
+ */
+ Table flatMap(String tableFunction);
+
+ /**
+ * Performs a flatMap operation with a table function.
Review comment:
Performs a flatMap operation with an user-defined table function or built-in
table function. The output will be flattened if the output type is a composite
type. ?
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