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https://issues.apache.org/jira/browse/DIRSERVER-971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529570
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Emmanuel Lecharny commented on DIRSERVER-971:
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The filter should be parsed and normalized into the NormalizerService.

First, we should not let a filter go down to the backend with textual 
attributes. We should use their OID instead.
Second, I agree with Ersin, we should pre-evaluate the filter so that we 
discard all the bad attributes, and replace them with an UndefinedNode

> Provide specific filter nodes for True, False and Undefined, and handle them 
> in the search engine
> -------------------------------------------------------------------------------------------------
>
>                 Key: DIRSERVER-971
>                 URL: https://issues.apache.org/jira/browse/DIRSERVER-971
>             Project: Directory ApacheDS
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.5.0, 1.0
>            Reporter: Ersin Er
>             Fix For: 1.5.2
>
>
> We need to be able to construct or modify search filters with special nodes 
> for True, False and Undefined. And the search engine should be able to handle 
> these. This is especially needed for DIRSERVER-955.

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