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https://issues.apache.org/jira/browse/SOLR-17255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840583#comment-17840583
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Chris M. Hostetter commented on SOLR-17255:
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I think you added {{SolrParams.toLocalParamsString}} but the logic for
handling in {{ClientUtils.encodeLocalParamVal}} dates back much older – it
looks like it was intentionally added by SOLR-2110 ? .... I haven't really dug
into the history but it looks like that jira (and the tests it add) are trying
to ensure that values starting with {{"$"}} are *intentionally* quoted ...
evidently because of how some facet refinement logic (that calls
{{encodeLocalParamVal}} directly) duplicates {{"key"}} local params and it
must have been trying to derefrence the values when it shouldn't have been?
I suspect the "correct" fix (w/o breaking faceting) is that
{{SolrParams.toLocalParamsString}} should special case check for param refs,
and not delegate to {{ClientUtils.encodeLocalParamVal}} in that case? (and of
course: a lot more tests and javadocs about what callers can/should expect)
> ClientUtils.encodeLocalParamVal doesn't work with param refs, breaks
> SolrParams.toLocalParamsString
> ---------------------------------------------------------------------------------------------------
>
> Key: SOLR-17255
> URL: https://issues.apache.org/jira/browse/SOLR-17255
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Reporter: Chris M. Hostetter
> Priority: Major
>
> If you try to use {{SolrParams.toLocalParamsString}} where some of your param
> values are {{$other_param}} style param references, those refs will wind up
> wrapped in single quotes, preventing the param de-referencing from working.
> Example...
> {code:java}
> final ModifiableSolrParams params = new ModifiableSolrParams();
> params.set("type", "edismax");
> params.set("v","$other_param");
> System.out.println(params.toLocalParamString())
> // Output: {! type=edismax v='$other_param'}
> {code}
> Ironically: {{ClientUtils.encodeLocalParamVal}} actually has a check to see
> if the string starts with {{"$"}} which causes it to bypass a loop that
> checks to see if the string needs to be quoted – but bypassing that loop
> doesn't leave the method variables ({{{}i{}}} and {{{}len{}}}) in a state
> that allow the subsequent short-circut check (which returns the original
> value) to kick in – so the value is always falls through to the {{// We need
> to enclose in quotes... but now we need to escape}} logic
> (It looks like this bug has always existed in every version of these methods)
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