[英]How to sort Numeric field in Lucene 6
I want to sort my search result based on a numeric field. 我想根据数字字段对搜索结果进行排序。 In the following example code, I want to sort based on the 'age' field. 在以下示例代码中,我想基于'age'字段进行排序。 I start from using the answers from: 我从使用以下答案开始:
[ How to sort IntPont or LongPoint field in Lucene 6 [ 如何在Lucene 6中对IntPont或LongPoint字段进行排序
But it does sort based SCORE. 但它确实基于SCORE排序。 The age are still not ascending. 年龄仍未提升。
And 和
[ Sorting search result in Lucene based on a numeric field [ 根据数字字段在Lucene中对搜索结果进行排序
I changed SortField.Type.SCORE to SortField.Type.LONG in the search function. 我在搜索功能中将SortField.Type.SCORE更改为SortField.Type.LONG。 But I get: 但我得到:
unexpected docvalues type NONE for field 'age' (expected=NUMERIC) 意外的docvalues为字段'age'键入NONE(预期= NUMERIC)
Here my code: 这是我的代码:
public class TestLongPointSort {
public static void main(String[] args) throws Exception {
String indexPath = "/tmp/testSort";
Analyzer standardAnalyzer = new StandardAnalyzer();
Directory indexDir = FSDirectory.open(Paths.get(indexPath));
IndexWriterConfig iwc = new IndexWriterConfig(standardAnalyzer);
iwc.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);
IndexWriter masterIndex = new IndexWriter(indexDir, iwc);
Document doc = new Document();
String name = "bob";
doc.add(new TextField("name", name, Field.Store.YES));
doc.add(new SortedDocValuesField("name", new BytesRef(name)));
doc.add(new SortedNumericDocValuesField("age", 20L));
doc.add(new StoredField("age", 20L));
long ts = System.currentTimeMillis();
doc.add(new SortedNumericDocValuesField("ts", ts));
doc.add(new StoredField("ts", ts));
masterIndex.addDocument(doc);
Thread.sleep(1);
name = "max";
doc = new Document();
doc.add(new TextField("name", name, Field.Store.YES));
doc.add(new SortedDocValuesField("name", new BytesRef(name)));
doc.add(new SortedNumericDocValuesField("age", 19L));
doc.add(new StoredField("age", 19L));
ts = System.currentTimeMillis();
doc.add(new SortedNumericDocValuesField("ts", ts));
doc.add(new StoredField("ts", ts));
masterIndex.addDocument(doc);
Thread.sleep(1);
name = "jim";
doc = new Document();
doc.add(new TextField("name", name, Field.Store.YES));
doc.add(new SortedDocValuesField("name", new BytesRef(name)));
doc.add(new SortedNumericDocValuesField("age", 21L));
doc.add(new StoredField("age", 21L));
ts = System.currentTimeMillis();
doc.add(new SortedNumericDocValuesField("ts", ts));
doc.add(new StoredField("ts", ts));
masterIndex.addDocument(doc);
masterIndex.commit();
masterIndex.close();
IndexReader reader = DirectoryReader.open(FSDirectory.open(Paths.get(indexPath)));
IndexSearcher searcher = new IndexSearcher(reader);
Analyzer analyzer = new KeywordAnalyzer();
QueryParser queryParser = new QueryParser("message", analyzer);
Sort sort;
TopDocs docs;
sort = new Sort(new SortField("name", SortField.Type.STRING));
docs = searcher.search(new MatchAllDocsQuery(), 100, sort);
System.out.println("Sorted by name");
for (ScoreDoc scoreDoc : docs.scoreDocs) {
Document doc2 = searcher.doc(scoreDoc.doc);
System.out.println("Name:" + doc2.get("name") + " ; age:" + doc2.get("age") + " ; ts:" + doc2.get("ts"));
}
//docs = searcher.search(new MatchAllDocsQuery(), 100, new Sort(new SortField("age", SortField.Type.SCORE, true)));
docs = searcher.search(new MatchAllDocsQuery(), 100, new Sort(new SortField("age", SortField.Type.LONG, true)));
System.out.println("Sorted by age");
for (ScoreDoc scoreDoc : docs.scoreDocs) {
Document doc2 = searcher.doc(scoreDoc.doc);
System.out.println("Name:" + doc2.get("name") + " ; age:" + doc2.get("age") + " ; ts:" + doc2.get("ts"));
}
reader.close();
}
}
As we can see, sorting STRING is good but I didn't figure out how I can get my numbers (LONG) sorted. 正如我们所看到的,排序STRING是好的,但我没有弄清楚如何将我的数字(LONG)排序。
What is the right way to sort Numeric fields? 排序数字字段的正确方法是什么?
Thanks 谢谢
To sort search results using a SortedNumericDocValuesField
, you'll need to use a SortedNumericSortField
: 要使用SortedNumericDocValuesField
对搜索结果进行排序,您需要使用SortedNumericSortField
:
Sort sort = new Sort(new SortedNumericSortField("age", SortField.Type.LONG, true));
TopDocs docs = searcher.search(new MatchAllDocsQuery(), 100, sort);
I would suggest you use ArrayList to store data from Document rather than saving it to another document, then use sort methods of ArrayList. 我建议您使用ArrayList存储来自Document的数据,而不是将其保存到另一个文档,然后使用ArrayList的排序方法。
Please visit these links for your reference. 请访问这些链接以供参考。
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