[jira] [Commented] (LUCENE-9360) might be NEEDED. ToParentDocValues uses advanceExact() of underneath DocValues

["Mikhail Khludnev (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LUCENE-9360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17111934#comment-17111934 ] 

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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