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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7452) Add helper methods for all built-in Flink types to Types
Date Mon, 28 Aug 2017 16:01:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143937#comment-16143937

ASF GitHub Bot commented on FLINK-7452:

GitHub user twalthr opened a pull request:


    [FLINK-7452] [types] Add helper methods for all built-in Flink types

    ## What is the purpose of the change
    This PR provides an unified, detailed, and easy to use utility to work with Flink's built-in
Java types.
    This class helps users to get an overview about built-in Flink types and their features/limitations
(esp. regarding null support).
    ## Brief change log
    Improved `org.apache.flink.api.common.typeinfo.Types`.
    ## Verifying this change
    This change is a trivial rework / code cleanup without any test coverage.
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency): no
      - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: yes
      - The serializers: no
      - The runtime per-record code paths (performance sensitive): no
      - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: no
    ## Documentation
      - Does this pull request introduce a new feature? no
      - If yes, how is the feature documented? JavaDocs

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/twalthr/flink FLINK-7452

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #4612
commit 2e027ed3c4671363f7023dd9faf7ba0d0c827312
Author: twalthr <twalthr@apache.org>
Date:   2017-08-28T12:13:07Z

    [FLINK-7452] [types] Add helper methods for all built-in Flink types to Types


> Add helper methods for all built-in Flink types to Types
> --------------------------------------------------------
>                 Key: FLINK-7452
>                 URL: https://issues.apache.org/jira/browse/FLINK-7452
>             Project: Flink
>          Issue Type: Improvement
>          Components: Type Serialization System
>            Reporter: Timo Walther
>            Assignee: Timo Walther
> Sometimes it is very difficult to provide `TypeInformation` manually, in case some extraction
fails or is not available. {{TypeHint}}s should be the preferred way but this methods can
ensure correct types.
> I propose to add all built-in Flink types to the {{Types}}. Such as:
> {code}
> Types.POJO(MyPojo.class)
> Types.POJO(Map<String, TypeInformation>)
> Types.GENERIC(Object.class)
> Types.TUPLE(TypeInformation, ...)
> Types.MAP(TypeInformation, TypeInformation)
> {code}
> The methods should validate that the returned type is exactly the requested type. And
especially in case of POJO should help creating  {{PojoTypeInfo}}.
> Once this is in place, we can deprecate the {{TypeInfoParser}}.

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