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https://issues.apache.org/jira/browse/SOLR-398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554581
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Yonik Seeley commented on SOLR-398:
-----------------------------------

{quote}This will break back-compatibility, right?{quote}
Unfortunately, yes.  That's why I only changed methods that accepted a Field, 
but couldn't change return types because of potential code like:  Field f = 
ft.createField()

{quote}Better to deprecate and add a new method?{quote}
Probably, if creation of fields might be done in custom request handlers.

> Widen return type of FiledType.createField to Fieldable in order to maximize 
> flexibility
> ----------------------------------------------------------------------------------------
>
>                 Key: SOLR-398
>                 URL: https://issues.apache.org/jira/browse/SOLR-398
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>    Affects Versions: 1.2, 1.3
>            Reporter: Espen Amble Kolstad
>            Priority: Minor
>         Attachments: 1.2-FieldType.patch, trunk-FieldType.patch
>
>
> FieldType.createField currently returns Field.
> In order to maximize flexibility for developers to extend Solr, it should 
> return Fieldable.

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