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https://issues.apache.org/jira/browse/SOLR-17974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18045914#comment-18045914
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Alessandro Benedetti commented on SOLR-17974:
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And by the way, I ended up in exactly this issue, while working on a children
transformer to flat nested vectors into the parent document.
I'll work on this these days and carefully read your existing discussion.
> Tech-Debt repayment: SolrDocument/SolrInputDocument will merge multiple
> "list" values
> -------------------------------------------------------------------------------------
>
> Key: SOLR-17974
> URL: https://issues.apache.org/jira/browse/SOLR-17974
> Project: Solr
> Issue Type: Task
> Reporter: Chris M. Hostetter
> Priority: Major
> Attachments: SOLR-17974.tests.patch
>
>
> A long standing bit of "convenience" logic in SolrDocument (that was later
> copied/inherited in SolrInputDocument) is that if you "add" a
> {{java.util.Collection}} of "values" for a field name it will either use that
> {{java.util.Collection}} as is; or -- if the document already has some values
> in it for that field name -- it unwraps the (new) {{java.util.Collection}}
> and adds each of the items in it to whatever existing
> {{java.util.Collection}} of values it already has for that field name.
> Once upon a time this kind of made life easier for folks - you could call one
> method on either a single value, or a list of values and Solr would "do what
> you mean".
> But as we get into a world where "multi-valued vector fields" start being a
> thing we have to consider, we need to rethink our APIs to ensure that (at a
> conceptual level, if not in terms of specific {{java.util.Collections}} class
> names) it's possible to have a "list of floats" as a single "field value" in
> a "multi-valued" field -- w/o a user getting confused why adding additional
> "field values" breaks their existing data.
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