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https://issues.apache.org/jira/browse/SOLR-11075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16088747#comment-16088747
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Erick Erickson commented on SOLR-11075:
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bq: I do not recall any particular reason why parameter values are joined with
a comma instead of adding the parameter for each value.
I'm pretty sure it was unintentional on my part when we went from Map<> to
SolrParams in SOLR-8467. That bit went from
Entry<String,String>
to
Entry<String,String[]>
and I said "Hmm, looks like the array of strings should be combined with a
comma". Wrong. Of course the old way wouldn't have worked for this case anyway
since you couldn't specify two "fq" clauses.
Anyway, it's good to have your perspective, I'll commit this soon.
> Refactor handling of params in CloudSolrStream and FacetStream
> --------------------------------------------------------------
>
> Key: SOLR-11075
> URL: https://issues.apache.org/jira/browse/SOLR-11075
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Attachments: SOLR-11075.patch
>
>
> We started to look more closely at how toExpression is used in these classes
> and the more we look the more puzzled we became (Varun and I that is).
> Is there any reason other than history why the params are pulled apart then
> reconstructed into comma-separated lists when there are more than one of any
> particular parameter? I suspect than when I worked on SOLR-8467 I didn't
> delve deeply enough here.
> [~dpgove][~joel.bernstein] [~risdenk] in particular we'd like your opinion.
> Arguably this is going to lead to anomalies, i.e. differences in what
> streaming selects .vs. what standard Solr would select.
> For instance, let's say the user puts two "q" parameters in. Standard Solr
> parsing uses the first one encountered. what happens when we get
> q=clause1,clause2 as a result of the toExpression is anybody's guess. It just
> shouldn't be different than straight-up Solr IMO.
> "fl" parameters on the other hand are all honored, as are "fq" clauses.
> Multiple "sort" clauses it appears first one wins.
> So my question is whether it makes sense to just add the parameter multiple
> times, presumably reflecting the actual query.
> Assigning to myself but someone else should feel free to take it
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