为什么Solr数据导入处理程序会散列uniqueKey？(Why does the Solr Data Import Handler hashes the uniqueKey?)

 我对Solr 4.6.0有一个非常奇怪的问题。 
 
 uniqueKey字段“id”包含每个文档的哈希值，而不是我的字符串值。 如果只在Solr管理员中添加一个带有更新请求处理程序的自定义文档，我会得到我指定的ID值“book_45”，这是正确的。 
 
 但是当我使用DIH（数据导入处理程序）进行完全导入时，id字段包含每个文档的哈希，例如“[B @ 53bd370f”而不是我的自定义值。 所以问题必须在DIH中。 
 
 我的导入脚本： 
 
<dataConfig>
<dataSource
    type="JdbcDataSource"
    driver="com.mysql.jdbc.Driver"
    url="jdbc:mysql://host/database"
    user="user"
    password="password" />
<document name="project">
    <entity name="document" transformer="RegexTransformer"
        query="SELECT CONCAT('book_', b.id) AS book_id, b.slug, b.title, b.isbn,
                b.publisher, b.releaseYear AS release_year, b.language, b.pageCount AS page_count, b.description,
                b.print, b.addedBy_id AS added_by_id, b.dt AS created,
                GROUP_CONCAT(a.name SEPARATOR ';') AS authors
            FROM Book b
            LEFT JOIN author_book ab ON ab.book_id = b.id
            LEFT JOIN Author a ON a.id = ab.author_id
            GROUP BY b.id
            ">
        <field column="book_id" name="id" />
        <field column="slug" name="book_slug" />
        <field column="title" name="book_title" />
        <field column="isbn" name="book_isbn" />
        <field column="publisher" name="book_publisher" />
        <field column="release_year" name="book_release_year" />
        <field column="language" name="book_language" />
        <field column="page_count" name="book_page_count" />
        <field column="description" name="book_description" />
        <field column="print" name="book_print" />
        <field column="added_by_id" name="book_added_by_id" />
        <field column="created" name="book_created" />
        <field column="authors" splitBy=";" name="authors" />
    </entity>
</document>
 
 
 schema.xml中的id字段（与默认发布的core collection1中的id字段相同）： 
 
<field name="id" type="string" indexed="true" stored="true" required="true" multiValued="false" />
<uniqueKey>id</uniqueKey>
 
 有谁知道我错过了什么？ 

I have a very strange problem with Solr 4.6.0. 
 
The uniqueKey field "id" contains a hash for every document instead of my string value. If add just one custom document with the update request handler in the Solr admin I get for example the ID value "book_45" that I specified, so that is correct.
 
But when I do a full import with the DIH (data import handler) then the id field contains a hash for every document like "[B@53bd370f" instead of my custom value. So the problem must be in the DIH.
 
My import script:
 
<dataConfig>
<dataSource
    type="JdbcDataSource"
    driver="com.mysql.jdbc.Driver"
    url="jdbc:mysql://host/database"
    user="user"
    password="password" />
<document name="project">
    <entity name="document" transformer="RegexTransformer"
        query="SELECT CONCAT('book_', b.id) AS book_id, b.slug, b.title, b.isbn,
                b.publisher, b.releaseYear AS release_year, b.language, b.pageCount AS page_count, b.description,
                b.print, b.addedBy_id AS added_by_id, b.dt AS created,
                GROUP_CONCAT(a.name SEPARATOR ';') AS authors
            FROM Book b
            LEFT JOIN author_book ab ON ab.book_id = b.id
            LEFT JOIN Author a ON a.id = ab.author_id
            GROUP BY b.id
            ">
        <field column="book_id" name="id" />
        <field column="slug" name="book_slug" />
        <field column="title" name="book_title" />
        <field column="isbn" name="book_isbn" />
        <field column="publisher" name="book_publisher" />
        <field column="release_year" name="book_release_year" />
        <field column="language" name="book_language" />
        <field column="page_count" name="book_page_count" />
        <field column="description" name="book_description" />
        <field column="print" name="book_print" />
        <field column="added_by_id" name="book_added_by_id" />
        <field column="created" name="book_created" />
        <field column="authors" splitBy=";" name="authors" />
    </entity>
</document>
 
 
The id field in my schema.xml (which is the same as in the default shipped core collection1):
 
<field name="id" type="string" indexed="true" stored="true" required="true" multiValued="false" />
<uniqueKey>id</uniqueKey>
 
Does anyone know what I am missing?

原文：