I think that sentence is misleading and refers to the internals of Flink. It should be removed, IMO. You can only union two DataSets. If you want to union more, you have to do it one by one.
Btw. union does not cause additional processing overhead. Cheers, Fabian 2016-05-19 14:44 GMT+02:00 Ritesh Kumar Singh <riteshoneinamill...@gmail.com >: > Thanks for the reply Fabian, > > Though here's a small thing I found on the documentation page: > > https://ci.apache.org/projects/flink/flink-docs-release-0.8/programming_guide.html#transformations > > If you look into the Union section, "This operation happens implicitly if > more than one data set is used for a specific function input." , I'm not > sure what this is supposed to mean. My initial assumption was something > like: > > dFinal = dFinal.union( d1, d2, ... , dN); // passing more than one > dataset as function input. > > But as expected, this does not satisfy the union method signature. And so > is that line supposed to mean something else? Or is it a feature not > supported by flink 0.8 but works with future releases? > > Thanks, > -- > Ritesh Kumar Singh > https://riteshtoday.wordpress.com/ >
