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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3521) Make Iterable part of method signature for WindowFunction
Date Fri, 26 Feb 2016 19:54:18 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15169665#comment-15169665

ASF GitHub Bot commented on FLINK-3521:

Github user StephanEwen commented on the pull request:

    May be unrelated to this change, but I think `fold()` for non-keyed windows is not incremental,
meaning it has no constant space requirement.

> Make Iterable part of method signature for WindowFunction
> ---------------------------------------------------------
>                 Key: FLINK-3521
>                 URL: https://issues.apache.org/jira/browse/FLINK-3521
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>            Priority: Blocker
> After discussion with [~StephanEwen],[~rmetzger], [~fhueske] it was decided that the
signature of WindowFunction should be changed.
> Right now, the signature is {{WindowFunction<IN, OUT, KEY, WINDOW>}}. With the
decision of whether the input is an {{Iterable}} nor not residing in the signature of the
method on {{WindowedStream}}, for example:
>  - {{WindowedStream.apply(WindowFunction<Iterable<IN>>, OUT, KEY, WINDOW>}}
>  - {{WindowedStream.apply(ReduceFunction, WindowFunction<IN, OUT, KEY, WINDOW>}}
> The {{Iterable<>}} should be moved into the signature of the {{apply}} method,
so that it is:
> {{void apply(KEY key, W window, Iterable<IN> input, Collector<OUT> out)}}

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