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Date: Wed, 21 Jun 2006 21:27:30 +0000 (GMT+00:00)
From: "Yonik Seeley (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-609) Lazy field loading breaks backward
 compat
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    [ http://issues.apache.org/jira/browse/LUCENE-609?page=comments#action_12417193 ] 

Yonik Seeley commented on LUCENE-609:
-------------------------------------

> I'm late to the discussion
Yes, I didn't leave much time for debate :-)  I really wanted to get back to something backward compatible so I could update Solr to use the latest Lucene.

> but it seems invalid to me. Won't getField() get a class cast exception

Yes, as I noted here:
http://www.nabble.com/Fieldable-breaks-backward-compatibility-t1825407.html#a4979233
But only if you are using the new Field options.  That's the price to pay for backward compatibility,  but it's a much better alternative than breaking everyones code when it's not necessary.

> it would have to do type testing on the members of fields. 

The JVM does this for us :-)

> Searchable was the same kind of thing.

I don't recall if it did breack backward compatibility, but even so... how many people write their own Searchers/IndexReaders vs how many people call Document.getField()?

> Lazy field loading breaks backward compat
> -----------------------------------------
>
>          Key: LUCENE-609
>          URL: http://issues.apache.org/jira/browse/LUCENE-609
>      Project: Lucene - Java
>         Type: Bug

>   Components: Other
>     Versions: 2.0.1
>     Reporter: Yonik Seeley
>     Assignee: Yonik Seeley
>      Fix For: 2.0.1
>  Attachments: fieldable_patch.diff
>
> Document.getField() and Document.getFields() have changed in a non backward compatible manner.
> Simple code like the following no longer compiles:
>  Field x = mydoc.getField("x");

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