[jira] [Created] (SOLR-5701) Allow DocTransformer to add arbitrary fields

["yuanyun.cn (JIRA)" <ji...@apache.org>]

yuanyun.cn created SOLR-5701:
--------------------------------

             Summary: Allow DocTransformer to add arbitrary fields
                 Key: SOLR-5701
                 URL: https://issues.apache.org/jira/browse/SOLR-5701
             Project: Solr
          Issue Type: Bug
          Components: search
            Reporter: yuanyun.cn
             Fix For: 5.0, 4.7


DocTransformer is very powerful, and allow us to add/remove or update fields before returning.

One limit we don't like is that it can only add one field, and the field name must be [transformer_name].

We may want to add multiple fields in one DocTransformer.

One possible solution is to add method getFieldNames into DocTransformer.
public abstract class DocTransformer{
   public void List<String> getFieldNames() { return null; }
}

Then in SolrReturnFields.add(String, NamedList<String>, DocTransformers, SolrQueryRequest)

Change augmenters.addTransformer( factory.create(disp, augmenterParams, req) ); like below:
DocTransformer docTransfomer = factory.create(disp, augmenterParams, req);
SolrReturnFields.add(docTransfomer);

then read fi3eldnames: docTransfomer.getFieldNames(); add them into SolrReturnFields.

DocTransfomer implementation would add all fields via doc.addField.



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