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https://issues.apache.org/jira/browse/LUCENE-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756536#comment-13756536
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Shai Erera commented on LUCENE-5178:
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I see. I think this can also happen if you use RandomCodec and it draws
Lucene42DVF? So in this case, with this seed, it trips if you set
postingsformat, but I'm not sure that in general this assume() is correct.
The ugly part of having a test calling _TestUtil.geDVF(field) (or we wrap it in
a nice method) is that the test will need to decide up front on all the fields
it uses, and if there's a mistake, the error may happen in the future and
harder to debug (i.e. spot that the test uses a different field than what it
passed to assume()). But I don't think that asserting the Codec is the right
test here, so this has to change.
> doc values should expose missing values (or allow configurable defaults)
> ------------------------------------------------------------------------
>
> Key: LUCENE-5178
> URL: https://issues.apache.org/jira/browse/LUCENE-5178
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Yonik Seeley
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5178.patch, LUCENE-5178_reintegrate.patch
>
>
> DocValues should somehow allow a configurable default per-field.
> Possible implementations include setting it on the field in the document or
> registration of an IndexWriter callback.
> If we don't make the default configurable, then another option is to have
> DocValues fields keep track of whether a value was indexed for that document
> or not.
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