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https://issues.apache.org/jira/browse/SOLR-9505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16921463#comment-16921463
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Thomas Wöckinger commented on SOLR-9505:
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The additional tests are working in master branch, when SOLR-13592 and
SOLR-13539 are merged to branch 8.x they should work there too
> Extra tests to confirm Atomic Update remove behaviour
> -----------------------------------------------------
>
> Key: SOLR-9505
> URL: https://issues.apache.org/jira/browse/SOLR-9505
> Project: Solr
> Issue Type: Test
> Affects Versions: 7.0
> Reporter: Tim Owen
> Priority: Minor
> Attachments: SOLR-9505.patch
>
>
> The behaviour of the Atomic Update {{remove}} operation in the code doesn't
> match the description in the Confluence documentation, which has been
> questioned already. From looking at the source code, and using curl to
> confirm, the {{remove}} operation only removes the first occurrence of a
> value from a multi-valued field, it does not remove all occurrences. The
> {{removeregex}} operation does remove all, however.
> There are unit tests for Atomic Updates, but they didn't assert this
> behaviour, so I've added some extra assertions to confirm that, and a couple
> of extra tests including one that checks that {{removeregex}} does a Regex
> match of the whole value, not just a find-anywhere operation.
> I think it's the documentation that needs clarifying - the code behaves as
> expected (assuming {{remove}} was intended to work that way?)
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