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https://issues.apache.org/jira/browse/SOLR-12300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536339#comment-16536339
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Alexandre Rafalovitch commented on SOLR-12300:
----------------------------------------------
Jira formatting is complaining. Basically return an array with the field
name....
> 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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