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https://issues.apache.org/jira/browse/LUCENE-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713749#action_12713749
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Mark Miller commented on LUCENE-1665:
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+1. It doesnt work correctly with MultiSearcher either.
> Remove SortField.AUTO
> ---------------------
>
> Key: LUCENE-1665
> URL: https://issues.apache.org/jira/browse/LUCENE-1665
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 2.9
>
>
> I'd like to remove SortField.AUTO... it's dangerous for Lucene to
> guess the type of your field, based on the first term it encounters.
> It can easily be wrong, and, whether it's wrong or right could
> suddenly change as you index different documents.
> It unexepctedly binds SortField to needing an IndexReader to do the
> guessing.
> It's caused various problems in the past (most recently, for me on
> LUCENE-1656) as we fix other issues/make improvements.
> I'd prefer that users of Lucene's field sort be explicit about the
> type that Lucene should cast the field to. Someday, if we have
> optional strong[er] typing of Lucene's fields, such type information
> would already be known. But in the meantime, I think users should be
> explicit.
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