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https://issues.apache.org/jira/browse/SOLR-12300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536338#comment-16536338
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Alexandre Rafalovitch commented on SOLR-12300:
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I am unable to reproduce this on 7.4. Your custom transformer shadows the
underlying fields and they are not returned, regardless of the transformers
count. However, if you add the implementation of getExtraRequestFields, at
least the pass-through works.
{quote}
@Override
public String[] getExtraRequestFields() {
return new String[]{field\} ;
}
{quote}
Could you review your test and/or my suggestion against Solr 7.4 and let me
know if you still see any issues.
> Unpopulated SolrDocument using Custom DocTransformer
> ----------------------------------------------------
>
> Key: SOLR-12300
> URL: https://issues.apache.org/jira/browse/SOLR-12300
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 7.2, 7.3
> Environment: Microsoft Windows 10 Enterprise
> Version 10.0.14393 Build 14393
> Reporter: Landon Petzoldt
> Priority: Major
>
> When attempting to tag more than 2 fields with transformers, the documents'
> fields are not populated except for the id field. This seems to be specific
> to Solr 7+ as this was not an issue in Solr 6.4.2. The issue only seems to be
> present for custom transformers, and the default transformers seem to
> populate correctly.
> Steps for Reproduction in Solr 7.2 or 7.3
> # Create Java project and import {{*solr-core*}} and {{*solr-solrj*}}
> library jars.
> # Create classes {{*BlankTransformerFactory*}} and {{*BlankTransformer*}}
> [see gist|https://gist.github.com/clurdish/8683e56ea1b93978f7027844537a0232]
> # Build project and put resulting jar into {{*solr\contrib\plugins*}}
> # Create sample solr core {{*testcore*}}
> # Add configuration to the core's {{*solrconfig.xml*}} (see below)
> # Load sample documents into core (see below)
> # (2 fields) Navigate to
> {{http://localhost:8983/solr/testcore/select?q=*:*&indent=true&fl=Author:[blanktrans],Title:[blanktrans],id,layer}}
> *_all documents are returned correctly_*
> # (3 fields) Navigate to
> {{http://localhost:8983/solr/testcore/select?q=*:*&indent=true&fl=Author:[blanktrans],Title:[blanktrans],id,layer:[blanktrans]}}
> *_only id field is returned_*
> *{{solrconfig.xml}}*
> ...
> {{<lib dir="${solr.install.dir:../../../..}/contrib/plugins/" regex=".*\.jar"
> />}}
> ...
> {{<transformer name="blanktrans"
> class="debug.solr.plugins.transformers.BlankTransformerFactory" />}}
> ...
> *{{sample_data.json}}*
> {
> "id": "1",
> "Title": ["The Big Tree"],
> "layer": ["fims"]
> },
> {
> "id": "2",
> "Title": ["Far Far Away"],
> "layer": ["buildings"]
> },
> {
> "id": "3",
> "Title": ["Way Too Long"],
> "Author": ["Slim Jim McGee"],
> "layer": ["fims"]
> },
> {
> "id": "4",
> "Author": ["Rumplestiltskin"],
> "layer": ["tasks"]
> }
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