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