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https://issues.apache.org/jira/browse/LUCENE-6298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14337412#comment-14337412
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Michael McCandless commented on LUCENE-6298:
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+1
> empty SimpleQueryParser query should return empty BooleanQuery
> --------------------------------------------------------------
>
> Key: LUCENE-6298
> URL: https://issues.apache.org/jira/browse/LUCENE-6298
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/queryparser
> Affects Versions: 5.0
> Reporter: Lee Hinman
> Priority: Minor
> Attachments: LUCENE-6298.patch, LUCENE-6298.patch
>
>
> In order to be consistent with QueryParser, SimpleQueryParser should return
> an empty BooleanQuery instead of null when the analyzed query state is null
> (if the query text is entirely removed during analysis, for instance).
> Long term it would also be nice to be able to return a MatchNoDocsQuery (or
> something like that) instead of using null as a stand-in value for this.
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