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https://issues.apache.org/jira/browse/SOLR-14601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17147117#comment-17147117
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Mikhail Khludnev commented on SOLR-14601:
-----------------------------------------
{quote}child has only three allowed parameters: parentFilter,childFilter and
limit.
{quote}
I've checked
[https://lucene.apache.org/solr/guide/8_5/transforming-result-documents.html#child-childdoctransformerfactory]
it says that there's fl in child. Has it been changed since it was documented?
[~dsmiley], wdyt?
> Using [child] and [subquery] DocTransformer / FieldList
> -------------------------------------------------------
>
> Key: SOLR-14601
> URL: https://issues.apache.org/jira/browse/SOLR-14601
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SearchComponents - other
> Affects Versions: master (9.0), 8.5.2
> Environment: Docker Container 8.5.2 from Docker Hub
> Already existing in 9.0.0
> Reporter: Thomas Taroni
> Priority: Major
>
> If you are using in the fl parameter something like that and
> luceneMatchVersion is higher or equals then 8.0.0 :
> fl=*,[child],customer:[subquery] or
> fl=*,customer:[subquery],[child]
> It ends Up in any case in the following error (BadRequest) inside the
> SubQueryAugmenterFactory:
> {code:java}
> // code placeholder
> if (conflictMap.containsKey(field)) {
> throw new SolrException(ErrorCode.BAD_REQUEST,"[subquery] name "+field+" is
> uplicated");
> } else {
> conflictMap.put(field, true);
> }
> {code}
> It looks like that the following Snippet in ChildDocTransformerFactory(8.5.2
> and 9.0.0) already have added that field to the context.
> {code:java}
> // code placeholder 8.5.2
> String childReturnFields = params.get("fl");
> SolrReturnFields childSolrReturnFields;
> if(childReturnFields != null) {
> childSolrReturnFields = new SolrReturnFields(childReturnFields, req);
> } else if(req.getSchema().getDefaultLuceneMatchVersion().major < 8) {
> // ensure backwards for versions prior to SOLR 8
> childSolrReturnFields = new SolrReturnFields();
> } else {
> childSolrReturnFields = new SolrReturnFields(req);
> }
> {code}
> {code:java}
> // code placeholder master 9.0.0
> String childReturnFields = params.get("fl");
> SolrReturnFields childSolrReturnFields;
> if (childReturnFields != null) {
> childSolrReturnFields = new SolrReturnFields(childReturnFields, req);
> } else {
> childSolrReturnFields = new SolrReturnFields(req);
> }
> {code}
> It looks like childReturnFields includes also the customer:[subquery],
> eventually is a good idea to remove fields from other AugmenterFactories like
> [shard] or [subquery] from the childReturnFields variable
>
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