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https://issues.apache.org/jira/browse/SOLR-7059?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296440#comment-14296440
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Anshum Gupta commented on SOLR-7059:
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If this doesn't really affect anything other than paramSets, which is a new
feature, we should fix this (if we're able to, before 6640 is resolved).
> Using paramset with multi-valued keys leads to a 500
> ----------------------------------------------------
>
> Key: SOLR-7059
> URL: https://issues.apache.org/jira/browse/SOLR-7059
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.0
> Reporter: Anshum Gupta
>
> Here's my use case:
> I wanted to use param-sets to have {{facet.field=field1&facet.field=field2}}
> For the same, here is what I updated:
> {code}
> curl http://localhost:8983/solr/bike/config/params -H
> 'Content-type:application/json' -d
> '{
> "update" : {
> "facets" : {
> "facet.field":["start_station_name","end_station_name"]
> }
> }
> }'
> {code}
> When I tried to use the same, I got a 500.
> After looking at the code, seems like, RequestParams uses MapSolrParams,
> which banks on Map<String,String> map.
> This would need to change to support the multi-values.
> I also tried sending:
> {code}
> solr-5.0.0-SNAPSHOT > curl http://localhost:8983/solr/bike/config/params -H
> 'Content-type:application/json' -d '{"update" : { "facets" :
> {"facet.field":"start_station_name","facet.field":"end_station_name"}}}'
> {code}
> This overwrote the value of facet.field with the last seen/parsed value i.e.
> there was only one value in the end. This is expected as that's noggit's
> behavior i.e. doesn't complain and just overwrites the previous value with
> the same key.
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