Empty facets on Solr with MySQL

[PeterKerk]

I've set up Solr with MySQL.
My data import is succesful:
http://localhost:8983/solr/wordpress/dataimport?command=full-import

However, when trying to get the cat_name facets all facets are empty: 
http://localhost:8983/solr/wordpress/select/?indent=on&facet=true&sort=post_modified%20desc&q=*:*&start=0&rows=10&fl=id,post_title&facet.field=cat_name&facet.mincount=1

**data-config.xml**
        <dataConfig>
        <dataSource type="JdbcDataSource" driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/wordp" user="***" password="***" />
                <document name="articles">
                        <entity pk="ID" name="article" query="SELECT p.*, ( 
SELECT guid FROM
wp_posts WHERE id = m.meta_value ) AS imgurl 
        FROM wp_posts p
        LEFT JOIN  wp_postmeta m ON(p.id = m.post_id AND m.meta_key = 
'_thumbnail_id' )
        WHERE p.post_type =  'post'
        AND p.post_status =  'publish';">
                        
                                <entity name="post_categories" query="select 
wt.name as
cat_name,wt.slug,wtr.term_taxonomy_id,wtt.term_id,wtt.taxonomy from 
        wp_term_relationships wtr
        INNER JOIN wp_term_taxonomy wtt ON
wtt.term_taxonomy_id=wtr.term_taxonomy_id AND wtt.taxonomy='category'
        INNER JOIN wp_terms wt ON wt.term_id=wtt.term_taxonomy_id
        where wtr.object_id='${article.id}';">
                                </entity>       
                        </entity>
                </document>
        </dataConfig>


**schema.xml**

        <field name="cat_name" type="text" indexed="true" stored="true"
multiValued="true"  />  
        <field name="cat_name_raw" type="string" indexed="true" stored="true"
multiValued="true" />
        <copyField source="cat_name" dest="cat_name_raw"/>

What am I missing?

        
        



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