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https://issues.apache.org/jira/browse/SOLR-17255?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17840584#comment-17840584
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Chris M. Hostetter commented on SOLR-17255:
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Thinking about it more: {{SolrParams.toLocalParamsString}} also probably has a
bug if/when the value is the empty string? ...
Pretty sure a use case like this will break because it will produce something
like {{... bq= v=foo ...}} which will cause solr to try to use {{v=foo}} as
the value for the {{bq}} local param. Empty strings in local params need to be
quoted.
{code}
final ModifiableSolrParams params = new ModifiableSolrParams();
params.set("type", "edismax");
params.set("bq","");
params.set("v","foo");
System.out.println(params.toLocalParamString())
{code}
> 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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