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https://issues.apache.org/jira/browse/LUCENE-9360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111934#comment-17111934
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Mikhail Khludnev commented on LUCENE-9360:
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bq. what the problem is with calling advance() under the hood, can you explain
[~jpountz], it turns out like this: let's we have parents docnums:10,20,30.
While scoring 10th block child filter might jump to behind 20th block due to
absent child docs. And then {{ToParentDocValues.advanceExact(20)}} will drag
child field doc values back. It never happens in {{/master}} nor {{_8x}} now,
but attempting to reuse docVals across Sorting Group Heads lead to this
trouble.
LUCENE-9328 provides a fix for it, but it a little bit fragile. Really
appreciate your feedback. Thanks.
> might be NEEDED. ToParentDocValues uses advanceExact() of underneath DocValues
> ------------------------------------------------------------------------------
>
> Key: LUCENE-9360
> URL: https://issues.apache.org/jira/browse/LUCENE-9360
> Project: Lucene - Core
> Issue Type: Sub-task
> Reporter: Mikhail Khludnev
> Priority: Major
>
> Currently {{ToParentDocvalues.advanceExact()}} propagates it to
> {{DocValues.advance()}} as advised at LUCENE-7871. It causes some problem at
> LUCENE-9328 and seems not really reasonable. The later jira has patch
> attached which resolves this. The questions is why(not)?
> cc [~jpountz]
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