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https://issues.apache.org/jira/browse/LUCENE-6304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14339290#comment-14339290
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Adrien Grand commented on LUCENE-6304:
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I think the 0x1AA71190 of MatchAllDocsQuery is here to avoid that all Query
impls that only wrap a boost end up with the same hash code. Maybe a cleaner
way to do it would be to return Float.floatToIntBits(getBoost()) ^
getClass().hashCode().
bq. I wonder if it should just be sugar and rewrite() to a booleanquery with no
clauses?
+1 to rewrite to an empty BooleanQuery
> Add MatchNoDocsQuery that matches no documents
> ----------------------------------------------
>
> Key: LUCENE-6304
> URL: https://issues.apache.org/jira/browse/LUCENE-6304
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/search
> Affects Versions: 5.0
> Reporter: Lee Hinman
> Priority: Minor
> Attachments: LUCENE-6304.patch
>
>
> As a followup to LUCENE-6298, it would be nice to have an explicit
> MatchNoDocsQuery to indicate that no documents should be matched. This would
> hopefully be a better indicator than a BooleanQuery with no clauses or (even
> worse) null.
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