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

["Alexandre Rafalovitch (Jira)" <ji...@apache.org>]

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

Alexandre Rafalovitch resolved SOLR-9479.
-----------------------------------------
    Resolution: Won't Fix

> Extends DIH with transformation on Solr document level 
> -------------------------------------------------------
>
>                 Key: SOLR-9479
>                 URL: https://issues.apache.org/jira/browse/SOLR-9479
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Andrey Kudryavtsev
>            Priority: Major
>         Attachments: SOLR-9479.patch
>
>
> I use DIH to index nested documents.
> I have couple of use cases where field values on parent document depend on children documents 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_ (You have to use some kind of "transient fields" in your data-config, this fields are populated from child sources, so sometimes you have to read child sources twice (or more times) for this. Maybe I do it wrong?)
> I decided that maybe it makes sense to be able to apply transformation after nested documents were converted from collection of maps into good old hierarchical 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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