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From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1023) Provide Iterable instead of Iterator to grouped functions
Date Wed, 23 Jul 2014 10:34:38 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14071580#comment-14071580
] 

Stephan Ewen commented on FLINK-1023:
-------------------------------------

Does it make sense to have a rich object, like {{Sequence}} or so? It could implement, {{Iterator}},
{{Iterable}}, plus methods like {{materialize()}} so you could go through the sequence multiple
times.

It may be a bit redundant, though. Scala has tools for that already (for example to materialize
iterators).

> Provide Iterable instead of Iterator to grouped functions
> ---------------------------------------------------------
>
>                 Key: FLINK-1023
>                 URL: https://issues.apache.org/jira/browse/FLINK-1023
>             Project: Flink
>          Issue Type: Wish
>          Components: Java API
>            Reporter: Ufuk Celebi
>            Priority: Trivial
>              Labels: breaking-api
>
> I would like the grouped functions to provide an Iterable instead of an Iterator to the
user, e.g. for the {{reduce}} method of {{GroupReduceFunction}}.
> We had a discussion about this previously (I couldn't find the respective issues/list
threads right now) and the result was in favor of the change.
> We never got around to really push for it, because of the API break. With the renaming,
it should be less of an issue.



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