flink-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Stephan Ewen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1665) Add optional annotations for POJOs to specify the order of fields
Date Sun, 02 Aug 2015 17:36:04 GMT

    [ https://issues.apache.org/jira/browse/FLINK-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651103#comment-14651103

Stephan Ewen commented on FLINK-1665:

Hmm, not sure I am a bit fan of that. We are entering a weird space there, where we are hacking
a schema model into the POJOs.

For CSV parsers, why not do it like this:
env.readCsv(file).pojoType(MyPojo.class, "id", "name", "favorite joke", "afraidOfSpiders")

For Table to POJO conversion (and vice versa), we have attribute names already, no need to
impose an order...

> Add optional annotations for POJOs to specify the order of fields
> -----------------------------------------------------------------
>                 Key: FLINK-1665
>                 URL: https://issues.apache.org/jira/browse/FLINK-1665
>             Project: Flink
>          Issue Type: Improvement
>          Components: JobManager
>    Affects Versions: 0.8.0, 0.9
>            Reporter: Fabian Hueske
> The order of fields within a POJO is not well defined. 
> We could provide an optional annotation such as {{@Position(int)}} to enable the definition
of field orders.
> The order of fields is relevant when mapping data to POJOs such as when generating POJOs
from CSV input, converting POJOs to tuples (for example for the expression API), or when sorting
POJOs (see FLINK-1664).

This message was sent by Atlassian JIRA

View raw message