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https://issues.apache.org/jira/browse/SOLR-16681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17693717#comment-17693717
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Mikhail Khludnev commented on SOLR-16681:
-----------------------------------------
The issue seems specific to uniqueKey renaming. With this {{fl}} QueryComponent
doesn't recognize [uniqueKey
renaming|https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L1277],
and [can't merge
results|https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/handler/component/QueryComponent.java#L1327]
yielding empty page. I looked into SolrReturnFields source, but couldn't
realize how to handle it.
> Replacement field via fl doesn't work since 9.1
> -----------------------------------------------
>
> Key: SOLR-16681
> URL: https://issues.apache.org/jira/browse/SOLR-16681
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Mikhail Khludnev
> Priority: Minor
> Attachments: image-2023-02-26-09-48-31-974.png,
> image-2023-02-26-09-48-59-323.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> User reported a use case which were working before 9.1 but not anymore.
> The point is to logically replace a field (hereby it's {{id}} but it might
> behave same for any other)
> {{fl=old_id:id,id:new_id}}
> I'd say it's a kind of {{{}$mv new_id id{}}}. I've made a simple
> [reproducer|https://github.com/apache/solr/pull/1384].
> it fails with
> {code}
> - org.apache.solr.cloud.TestCloudPseudoReturnFields.test_mv_fl (:solr:core)
> [7597|https://github.com/apache/solr/actions/runs/4276380498/jobs/7444431149#step:4:7598]
> Test output:
> /tmp/src/solr/solr/core/build/test-results/test/outputs/OUTPUT-org.apache.solr.cloud.TestCloudPseudoReturnFields.txt
>
> [7598|https://github.com/apache/solr/actions/runs/4276380498/jobs/7444431149#step:4:7599]
> Reproduce with: gradlew :solr:core:test --tests
> "org.apache.solr.cloud.TestCloudPseudoReturnFields.test_mv_fl"
> -Ptests.jvms=96 "-Ptests.jvmargs=-XX:TieredStopAtLevel=1 -XX:+UseParallelGC
> -XX:ActiveProcessorCount=1 -XX:ReservedCodeCacheSize=120m"
> -Ptests.seed=4CCEBE424880B511 -Ptests.file.encoding=US-ASCII
> {code}
> . [Then I applied
> it|https://github.com/mkhludnev/solr/tree/SOLR-16681-proves-work-before] to
> revision preceding
> [SOLR-9376|https://github.com/mkhludnev/solr/commit/6ff81312607dd5d33f87dc52aed9d52938dc6883#diff-e72c1360a9b0097bcc01e269a94045ce5af1fdc93ae3021ca7e8d1b26d46bdcb]
> and test passed. For me it seems like:
> - Solr behaved like described before, but it does not after SOLR-9376.
> - Should we reproduce this behavior or we can suggest a workaround?
>
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