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Posted to dev@lucene.apache.org by "Thomas Egense (JIRA)" <ji...@apache.org> on 2014/08/14 08:23:14 UTC

[jira] [Created] (SOLR-6376) Edismax field alias bug

Thomas Egense created SOLR-6376:
-----------------------------------

             Summary: Edismax field alias bug
                 Key: SOLR-6376
                 URL: https://issues.apache.org/jira/browse/SOLR-6376
             Project: Solr
          Issue Type: Bug
          Components: query parsers
    Affects Versions: 4.9, 4.8, 4.7.2, 4.7, 4.6.1
            Reporter: Thomas Egense
            Priority: Minor


If you create a field alias that maps to a nonexistent field, the query will be parsed to utter garbage.

The bug can reproduced very easily. Add the following line to the /browse request handler in the tutorial example solrconfig.xml
<str name="f.name_features.qf">name features XXX</str>
(XXX is a nonexistent field)

This simple query will actually work correctly: 
name_features:video
and it will be parsed to  (features:video | name:video) and return 3 results. It has simply discarded the nonexistent field and the result set is correct.
However if you change the query to:
name_features:video AND name_features:video
you will now get 0 result and the query is parsed to 
+(((features:video | name:video) (id:AND^10.0 | author:and^2.0 | title:and^10.0 | cat:AND^1.4 | text:and^0.5 | keywords:and^5.0 | manu:and^1.1 | description:and^5.0 | resourcename:and | name:and^1.2 | features:and) (features:video | name:video))~3)
Notice the AND operator is now used a term! The parsed query can turn out even worse and produce query parts such as:
title:2~2    
title:and^2.0^10.0  

Prefered solution: During start up, shut down Solr if there is a nonexistant field alias. Just as is the case if the cycle-detection detects a cycle:
Acceptable solution: Ignore the nonexistant field totally.

Thomas Egense



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