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https://issues.apache.org/jira/browse/SOLR-2970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170440#comment-13170440
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Jan Høydahl commented on SOLR-2970:
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So there are two distinct issues here
A) CSV attempts to return fields which are not stored - which is bound to
always return blank value
B) When returning a stored field which has no value (null) for a document,
there is no way to distinguish that from the empty string case
I think B) should have its own JIRA.
For A), I still cannot see any usecase where you want to ask for a non-stored
field in the CSV output, even if you ask for it explicitly - since it will
always be null/empty. If you ask the XML or JSON writer for a non-stored field,
you never get it no matter what - it formally does not exist in this context.
> 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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