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Subject [GitHub] [flink] hequn8128 commented on a change in pull request #7196: [FLINK-10974] [table] Add support for flatMap to table API
Date Mon, 08 Apr 2019 06:44:26 GMT
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
 ##########
 @@ -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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