hequn8128 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_r272878771
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
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@@ -1021,4 +1021,31 @@
* </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 an user-defined table function.
Review comment:
I think we can drop the `user-defined`. I the long term, we will have
built-in table function and it can also be used in `flatMap`. What do you think?
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