Michael Ryan created SOLR-6686:
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             Summary: facet.threads can return wrong results when using 
facet.prefix multiple times on same field
                 Key: SOLR-6686
                 URL: https://issues.apache.org/jira/browse/SOLR-6686
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 4.9
            Reporter: Michael Ryan


When using facet.threads, SimpleFacets can return the wrong results when using 
facet.prefix multiple times on the same field.

The problem is that SimpleFacets essentially stores the prefix value in a 
global variable, rather than passing the current prefix value into the 
Callable. So, the prefix value that is used when getting the term counts is 
whichever one was the last one parsed.

STEPS TO REPRODUCE:
# Create a document with a string field named "myFieldName" and value "foo"
# Create another document with a string field named "myFieldName" and value 
"bar"
# Run this query: {noformat}q=*:*&rows=0&facet=true&facet.field={!key=key1 
facet.prefix=foo}myFieldName&facet.field={!key=key2 
facet.prefix=bar}myFieldName&facet.threads=1{noformat}

EXPECTED:
{noformat}<lst name="facet_fields">
  <lst name="key1">
    <int name="foo">1</int>
  </lst>
  <lst name="key2">
    <int name="bar">1</int>
  </lst>
</lst>{noformat}

ACTUAL:
{noformat}<lst name="facet_fields">
  <lst name="key1">
    <int name="bar">1</int>
  </lst>
  <lst name="key2">
    <int name="bar">1</int>
  </lst>
</lst>{noformat}

I'm using 4.9, but I think this affects all versions.

A user previously reported this here:
http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201405.mbox/%[email protected]%3E

I think this affects parameters other than facet.prefix, but I have not tried 
that yet.



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