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https://issues.apache.org/jira/browse/SOLR-12139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422609#comment-16422609
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Andrey Kudryavtsev commented on SOLR-12139:
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{quote}
And as I look at it in my IDE finally, the implementation here becomes a bit
odd in that it modifies SolrComparisonBoolFunction to in certain cases
completely ignore the {{Compare cmp}} field that is supposedly fundamental to
defining what an instance of this class is going to do, and instead calls
Object.equals.
To rectify the issues above, we could create a new subclass of
ComparisonBoolFunction explicitly for equality...
{quote}
+1
{quote}
Overloading "eq" here could introduce a subtle back-compat break with an
existing user if it doesn't detect the types correctly, and I suspect it's not
always resolvable
{quote}
So it's a {{ValueSource}} which pretends to be numeric by nether extends
{{LongDocValues}} / {{IntDocValues}} / {{DoubleDocValues}} / {{FloatDocValues}}
nor implements {{objectVal(...)}} method. I personally feel like it would be
better to fix such {{ValueSources}} instead of making additional checks, but
if a backward compatibility is a must have...having new equal function would
work.
> Support "eq" function for string fields
> ---------------------------------------
>
> Key: SOLR-12139
> URL: https://issues.apache.org/jira/browse/SOLR-12139
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: search
> Reporter: Andrey Kudryavtsev
> Assignee: David Smiley
> Priority: Minor
> Attachments: SOLR-12139.patch, SOLR-12139.patch, SOLR-12139.patch,
> SOLR-12139.patch, SOLR-12139.patch
>
>
> I just discovered that {{eq}} user function will work for numeric fields only.
> For string types it results in {{java.lang.UnsupportedOperationException}}
> What do you think if we will extend it to support at least some of string
> types as well?
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