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https://issues.apache.org/jira/browse/SOLR-801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642865#action_12642865
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Noble Paul commented on SOLR-801:
---------------------------------

per root-entity preImport deletes are common .while the post import delete 
queries are rare. So chosen to name the pre import query as deleteByQuery. 

> configurable delete query  per root-entity
> ------------------------------------------
>
>                 Key: SOLR-801
>                 URL: https://issues.apache.org/jira/browse/SOLR-801
>             Project: Solr
>          Issue Type: New Feature
>          Components: contrib - DataImportHandler
>    Affects Versions: 1.3
>            Reporter: Noble Paul
>             Fix For: 1.4
>
>         Attachments: SOLR-801.patch
>
>
> Now on a full import DIH deletes *:* which is a problem if I have different 
> root entities .
> Suggest having a deleteByQuery attribute for each root entity so that cleanup 
> can issue a different query instead of *:*

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