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https://issues.apache.org/jira/browse/LUCENE-10085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17516122#comment-17516122
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Julie Tibshirani commented on LUCENE-10085:
-------------------------------------------

I noticed a (possibly rare) failure. I didn't have the chance to look into it, 
but it seems like just a test bug. Reproduce line:
{code:java}
./gradlew test --tests TestDocValuesFieldExistsQuery.testQueryMatchesCount 
-Dtests.seed=2AE288D9EAFE5D6C
{code}
Failure excerpt:
{code:java}
org.apache.lucene.search.TestDocValuesFieldExistsQuery > testQueryMatchesCount 
FAILED
    java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
        at 
__randomizedtesting.SeedInfo.seed([2AE288D9EAFE5D6C:DE155D6B02C5FE76]:0)
        at 
java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
        at 
java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
        at 
java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
        at java.base/java.util.Objects.checkIndex(Objects.java:359)
        at java.base/java.util.ArrayList.get(ArrayList.java:427)
        at 
java.base/java.util.Collections$UnmodifiableList.get(Collections.java:1347)
        at 
org.apache.lucene.search.TestDocValuesFieldExistsQuery.testQueryMatchesCount(TestDocValuesFieldExistsQuery.java:338)
{code}

> Implement Weight#count on DocValuesFieldExistsQuery
> ---------------------------------------------------
>
>                 Key: LUCENE-10085
>                 URL: https://issues.apache.org/jira/browse/LUCENE-10085
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Adrien Grand
>            Priority: Minor
>             Fix For: 9.1
>
>          Time Spent: 4h 20m
>  Remaining Estimate: 0h
>
> Now that we require all documents to use the same features (LUCENE-9334) we 
> could implement {{Weight#count}} to return docCount if either terms or points 
> are indexed.



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