如何在Apache Solr中创建复合键字段？(How to create a composite Key Field in Apache Solr?)

 我有一个Apache Solr 3.5设置，它有一个像这样的SchemaXml： 
 
<field name="appid" type="string" indexed="true" stored="true" required="true"/>
<field name="docid" type="string" indexed="true" stored="true" required="true"/>
 
 我需要的是一个将它们连接在一起并将其用作<uniqueKey>的字段。 似乎没有内置，没有创建多值id字段和使用<copyField> ，但似乎uniqueKey需要单值字段。 
 
 我需要这个的唯一原因是允许客户盲目地发出<add>调用，并让Solr弄清楚它是否是添加或更新。 因此，我不太关心ID的样子。 
 
 我想我必须编写自己的Analyzer或Tokenizer？ 我刚刚开始学习Solr，所以我不能100％确定我真正需要的东西，并且会欣赏我需要实现的任何提示。 

I have an Apache Solr 3.5 setup that has a SchemaXml like this:
 
<field name="appid" type="string" indexed="true" stored="true" required="true"/>
<field name="docid" type="string" indexed="true" stored="true" required="true"/>
 
What I would need is a field that concatenates them together and uses that as <uniqueKey>. There seems nothing built-in, short of creating a multi-valued id field and using <copyField>, but it seems uniqueKey requires a single-valued field.
 
The only reason I need this is to allow clients to blindly fire <add> calls and have Solr figure out if it's an addition or update. Therefore, I don't care too much how the ID looks like.
 
I assume I would have to write my own Analyzer or Tokenizer? I'm just starting out learning Solr, so I'm not 100% sure what I'd actually need and would appreciate any hints towards what I need to implement. 

原文：https://stackoverflow.com/questions/9775143