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Date: Wed, 8 Mar 2017 15:36:37 +0000 (UTC)
From: "Aviem Zur (JIRA)" <jira@apache.org>
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Subject: [jira] [Assigned] (BEAM-1336) A StateSpec that doesn't care about
 the key shouldn't be forced to declare it as type Object
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archived-at: Wed, 08 Mar 2017 15:36:42 -0000


     [ https://issues.apache.org/jira/browse/BEAM-1336?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aviem Zur reassigned BEAM-1336:
-------------------------------

    Assignee: Aviem Zur

> A StateSpec that doesn't care about the key shouldn't be forced to declare it as type Object
> --------------------------------------------------------------------------------------------
>
>                 Key: BEAM-1336
>                 URL: https://issues.apache.org/jira/browse/BEAM-1336
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Kenneth Knowles
>            Assignee: Aviem Zur
>            Priority: Minor
>              Labels: starter
>
> In the state API as it exists today, if (as is almost often the case) you are writing a {{StateSpec<K, StateT>}} other than a {{KeyedCombiningState}} the key type is irrelevant and the user just has to write {{Object}} there. This was carried over from {{StateTag}} and is an artifact of the visitor pattern there and the difficulty of getting all the types to line up.
> I think simplifying the visitor pattern to be more of just a syntax traversal might alleviate the issue and allow us to drop this noise from the syntax.


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