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https://issues.apache.org/jira/browse/SOLR-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170357#comment-13170357
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Chris A. Mattmann commented on SOLR-2970:
-----------------------------------------

I ran into this when I was putting together the original patch for SOLR-1925, 
and believe that indeed the order of a field requested is important. And yes, 
as Yonik put it, CSV doesn't seem to have a native representation for null.

What about a configuration parameter (perhaps attached to the request) to 
identify a "placeholder" for missing or non-stored values? We see this a lot in 
science data, when the data quality flag specifies that we should put in a fill 
value.
                
> CSV ResponseWriter returns fields defined as stored=false in schema
> -------------------------------------------------------------------
>
>                 Key: SOLR-2970
>                 URL: https://issues.apache.org/jira/browse/SOLR-2970
>             Project: Solr
>          Issue Type: Bug
>          Components: Response Writers
>            Reporter: Jan Høydahl
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: SOLR-2970.patch
>
>
> 1. Add &wt=csv to a query
> 2. You get columns for non-stored fields

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