Lucene:使用DocValues添加字段时为null值

我通过搜索更改了文档字段以使其可排序,但现在addDocument()抛出一个异常,说明字段值为空,尽管我在添加字段时验证了该电子邮件是非空字符串.在异常之前Lucene代码binaryValue()从字段中获取.怀疑StringField构造函数不接受自定义FieldType.我可以使用String字段进行排序吗？如何解决这个问题？

Lucene 5.3.1

    private static final FieldType EMAIL_FIELD_TYPE = new FieldType(StringField.TYPE_STORED);
    static
    {
        EMAIL_FIELD_TYPE.setDocValuesType(DocValuesType.SORTED);
        EMAIL_FIELD_TYPE.freeze();
    }

    ...
        doc.add(new Field("email", email, EMAIL_FIELD_TYPE));
    ...
        writer.addDocument(doc);
        writer.commit();

java.lang.IllegalArgumentException: field "email": null value not allowed
    at org.apache.lucene.index.SortedDocValuesWriter.addValue(SortedDocValuesWriter.java:65)
    at org.apache.lucene.index.DefaultIndexingChain.indexDocValue(DefaultIndexingChain.java:435)
    at org.apache.lucene.index.DefaultIndexingChain.processField(DefaultIndexingChain.java:376)
    at org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:300)
    at org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:234)
    at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:450)
    at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1475)
    at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1254)

编辑:

此代码用于搜索:

Query q = new WildcardQuery(new Term("email", "*"));
Sort sort = new Sort(new SortField("email", SortField.Type.STRING));
TopDocs res = searcher.search(q, Integer.MAX_VALUE, sort);

heenenee.. 5

您需要单独添加一个SortedDocValuesField以利用Lucene 5中新的更快排序.在建立索引时,将email字段添加到文档中,如下所示:

doc.add(new StringField("email", email, Field.Store.YES));
doc.add(new SortedDocValuesField("email", new BytesRef(email)));

此外,如果您在搜索中尝试使用电子邮件查找所有文档,最好使用a new FieldValueQuery("email")而不是WildcardQuery.

您需要单独添加一个SortedDocValuesField以利用Lucene 5中新的更快排序.在建立索引时,将email字段添加到文档中,如下所示:

doc.add(new StringField("email", email, Field.Store.YES));
doc.add(new SortedDocValuesField("email", new BytesRef(email)));

此外,如果您在搜索中尝试使用电子邮件查找所有文档,最好使用a new FieldValueQuery("email")而不是WildcardQuery.