使用Solr索引存储在PostgreSQL大对象功能中的二进制数据

Question

使用Solr 7.72，我们有一个PostgreSQL数据库，该数据库使用大对象功能https://jdbc.postgresql.org/documentation/head/binary-data.html存储二进制数据，并且无法正确配置Solr来对该字段进行索引。使用下面的db-data-config.xml：

<dataConfig>
  <dataSource 
    type="JdbcDataSource"
    name="ISO17025V3"
    driver="org.postgresql.Driver" 
    url="jdbc:postgresql://IS-Config-DB:5432/ISO17025V3"
    batchSize="0" 
    user="postgres" 
    password="xxxxx"
  />
  <dataSource name="fieldReader"
    type="FieldStreamDataSource"
  />
  <uniqueKey>file_name</uniqueKey> 
  <document>
    <entity
      name="root"
        query="select d.file_name, dbf.file_contents, d.file_label, d.version, d.dir_num
            from db_document d 
            inner join db_files dbf on (d.file_name = dbf.original_file_name and d.version = dbf.document_version and d.revision_no = dbf.revision_no )
            where dbf.file_contents is not null and dbf.parent_file_name is null
            and d.version = (select max(version) from db_document d2 where d.file_name = d2.file_name)
            order by d.file_label"
      onError="skip"
      dataSource="ISO17025V3">
        <field column="file_name" name="file_name" />
    <entity
        name="blob2"
        dataSource="fieldReader"
        processor="TikaEntityProcessor"
        dataField="root.file_contents" format="text" onError="skip"  extractEmbedded="true">
    </entity>
      </entity>
    </document>
</dataConfig>

Returns the following records

导致以下Solr异常：

Exception in entity : blob2:java.lang.RuntimeException: unsupported type : class java.lang.Long
    at org.apache.solr.handler.dataimport.FieldStreamDataSource.getData(FieldStreamDataSource.java:77)
    at org.apache.solr.handler.dataimport.FieldStreamDataSource.getData(FieldStreamDataSource.java:47)
    at org.apache.solr.handler.dataimport.TikaEntityProcessor.nextRow(TikaEntityProcessor.java:132)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:267)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:476)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:517)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:415)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:330)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:233)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:424)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:483)
    at org.apache.solr.handler.dataimport.DataImporter.lambda$runAsync$0(DataImporter.java:466)
    at java.lang.Thread.run(Thread.java:748)

Solr是否可以使用PostgreSQL的大对象功能，还是必须将二进制数据存储为BYTEA？