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https://issues.apache.org/jira/browse/LUCENE-5178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13742182#comment-13742182
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Yonik Seeley commented on LUCENE-5178:
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Yes, I think tracking/exposing missing values is the best option, esp for
numerics where you can use the full range and still tell of there was a value
or not.
> 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
>
> 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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