[jira] [Created] (SOLR-7097) Able to update other Document in DocTransformer

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

yuanyun.cn created SOLR-7097:
--------------------------------

             Summary: Able to update other Document in DocTransformer
                 Key: SOLR-7097
                 URL: https://issues.apache.org/jira/browse/SOLR-7097
             Project: Solr
          Issue Type: Improvement
            Reporter: yuanyun.cn
            Priority: Minor


Solr DocTransformer is good, but it only allows us to change current document: add or remove, update fields.

It would be great if we can update other document(previous especially)  .

User case:
We can use flat group mode(group.main=true) to put parent and child close to each other(parent first), then we can use DocTransformer to update parent document when access its child document.

Some thought about Implementation:
org.apache.solr.response.TextResponseWriter.writeDocuments(String, ResultContext, ReturnFields)
when cachMode=true, in the for loop, after transform, we can store the solrdoc in a list, write these doc at the end.

cachMode = req.getParams().getBool("cachMode", false);
SolrDocument[] cachedDocs = new SolrDocument[sz];
for (int i = 0; i < sz; i++) {
 SolrDocument sdoc = toSolrDocument(doc);
 if (transformer != null) {
  transformer.transform(sdoc, id);
 }
 if(cachMode)
 {
    cachedDocs[i] = sdoc;
 }
 else{
    writeSolrDocument( null, sdoc, returnFields, i );
 }
  
}
if (transformer != null) {
 transformer.setContext(null);
}
if(cachMode) {
 for (int i = 0; i < sz; i++) {
  writeSolrDocument(null, cachedDocs[i], returnFields, i);
 }
}
writeEndDocumentList();



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