[jira] [Updated] (SOLR-9479) Extends DIH with transformation on Solr's document level

["Andrey Kudryavtsev (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-9479?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrey Kudryavtsev updated SOLR-9479:
-------------------------------------
    Attachment: SOLR-9479.patch

> Extends DIH with transformation on Solr's document level 
> ---------------------------------------------------------
>
>                 Key: SOLR-9479
>                 URL: https://issues.apache.org/jira/browse/SOLR-9479
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Andrey Kudryavtsev
>         Attachments: SOLR-9479.patch
>
>
> I use DIH to index nested documents.
> I have couple of use cases where fields values on parent document depend on children document values. The simplest one - I need to "propagate" values from all children documents to new field on parent document. It could be a little bit tricky with current DIH architecture when you can apply transformation for "plain" documents which considered as a  plain map. See _org.apache.solr.handler.dataimport.Transformer_
> I decided that maybe it makes sense to be able to apply transformation after nested documents were converted from collection of map into good old SolrInputDocument. 
> So this initial patch was created: 
> * It introduces concept of _DocumentTransformer_ with Java interface
> {code:java}SolrInputDocument transform(SolrInputDocument solrDoc, Context context) {code}
> * This interface should be implemented by clients transformers. One simple example of such transformer, _PropagationDocumentTransformer_, is implemented. It parametrised by two field names - child and parent, and copied values from children documents to parent document.  
> * This kind of transformer should be added into data-config.xml to corresponding parents _entry_:
> {code:xml}documentTransformer="org.apache.solr.handler.dataimport.PropagationDocumentTransformer"{code}



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