Andrey Kudryavtsev created SOLR-9479:
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Summary: 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
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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