raminqaf commented on code in PR #29133:
URL: https://github.com/apache/flink/pull/29133#discussion_r3987926034
##########
flink-streaming-java/src/test/java/org/apache/flink/streaming/api/DataStreamTest.java:
##########
@@ -836,6 +837,31 @@ public Long reduce(Long value1, Long value2) throws
Exception {
.isEqualTo(preferredResource7);
}
+ @Test
+ void testMapWithExplicitUuidType() {
+ final StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ // A lambda would bypass the input validation exercised by this test.
+ final MapFunction<UUID, String> mapper =
+ new MapFunction<UUID, String>() {
+ @Override
+ public String map(UUID value) {
+ return value.toString();
+ }
+ };
Review Comment:
Can be simplified to:
```suggestion
final MapFunction<UUID, String> mapper = UUID::toString;
```
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