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https://issues.apache.org/jira/browse/SOLR-18246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18081803#comment-18081803
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Umut Saribiyik commented on SOLR-18246:
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You’re welcome, and thanks for the quick review and testing! [~epugh]
> Solr Admin UI does not support multiple facet.field parameters correctly
> ------------------------------------------------------------------------
>
> Key: SOLR-18246
> URL: https://issues.apache.org/jira/browse/SOLR-18246
> Project: Solr
> Issue Type: Bug
> Components: Admin UI, query
> Affects Versions: 10.0, 9.10.1
> Reporter: Umut Saribiyik
> Assignee: Eric Pugh
> Priority: Minor
> Labels: pull-request-available
> Fix For: 10.1
>
> Attachments: image-2026-05-18-12-47-42-233.png,
> image-2026-05-18-12-47-55-672.png, image-2026-05-18-12-48-29-492.png,
> image-2026-05-18-12-48-54-341.png
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> h2. Description
> In the Solr Admin UI Query screen, it is possible to enable faceting and
> enter a value for {{{}facet.field{}}}.
> Using a single facet field works as expected. However, when trying to facet
> on multiple fields, the UI appears to generate a single {{facet.field}}
> parameter containing multiple values, for example:
> {code:java}
> facet.field=foo,bar {code}
> This does not work as expected, because Solr treats {{foo,bar}} as one facet
> field value.
> The correct request should repeat the {{facet.field}} parameter for each
> field, for example:
> {code:java}
> facet.field=foo&facet.field=bar {code}
> I also tried using the raw parameters area, but the generated request still
> seems to combine the values into a single {{facet.field}} parameter.
>
> h2. Steps to reproduce
> # Open the Solr Admin UI.
> # Select a collection.
> # Go to the Query screen.
> # Enable {{{}facet{}}}.
> # Enter more than one field for {{{}facet.field{}}}, for example
> {{{}foo,bar{}}}.
> # Execute the query.
> h2. Actual behavior
> The UI generates a request similar to:
> {code:java}
> facet.field=foo,bar {code}
> Solr treats this as a single facet field value, and the expected facets for
> both fields are not returned.
> h2. Expected behavior
> The UI should generate repeated {{facet.field}} parameters, for example:
> {code:java}
> facet.field=foo&facet.field=bar {code}
> This would allow users to facet on multiple fields from the Admin UI.
> h2. Additional note
> The same problem also occurs when using the raw parameters area. It is
> possible to enter multiple {{facet.field}} values there, but the request is
> still generated incorrectly, for example as:
> {code:java}
> facet.field=foo,bar {code}
> instead of:
> {code:java}
> facet.field=foo&facet.field=bar {code}
>
> So the raw parameters area does not avoid the issue.
> In addition, the dedicated {{facet.field}} input should support multiple
> facet fields correctly on its own. Users should not have to rely on raw
> parameters for this basic faceting use case.
>
>
>
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