Github user StephanEwen commented on a diff in the pull request:
https://github.com/apache/flink/pull/1462#discussion_r47921105
--- Diff: flink-java/src/main/java/org/apache/flink/api/java/DataSet.java
---
@@ -394,6 +396,21 @@ public long count() throws Exception {
return res.<Long> getAccumulatorResult(id);
}
+ /**
+ * Convenience method to get the count (number of elements) of a DataSet
+ * as well as the checksum (sum over element hashes).
+ *
+ * @return A Checksum that represents the count and checksum of
elements in the data set.
+ */
+ public Checksum checksum() throws Exception {
+ final String id = new AbstractID().toString();
+
+ flatMap(new Utils.ChecksumHelper<T>(id)).name("checksum()")
+ .output(new
DiscardingOutputFormat<NullValue>()).name("checksum() sink");
--- End diff --
Saves one operator and source of confusion in the UI. Actually, the
`collect()` and `count()` should be similarly simplified, come to think of it
;-)
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