don't terminate when binaryDocValues == null

src/main/java/com/uas/search/sort/DefaultFieldComparator.java

@@ -3,6 +3,8 @@ package com.uas.search.sort;
 import org.apache.lucene.index.BinaryDocValues;
 import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.search.SimpleFieldComparator;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.util.StringUtils;
 
 import java.io.IOException;
@@ -25,6 +27,8 @@ abstract class DefaultFieldComparator extends SimpleFieldComparator<String> {
     private String top;
     private String bottom;
 
+    private Logger logger = LoggerFactory.getLogger(getClass());
+
     DefaultFieldComparator(String fieldname, int numHits) {
         this.fieldname = fieldname;
         this.values = new String[numHits];
@@ -55,14 +59,14 @@ abstract class DefaultFieldComparator extends SimpleFieldComparator<String> {
 
     @Override
     public void copy(int slot, int doc) throws IOException {
-        values[slot] = binaryDocValues.get(doc).utf8ToString();
+        values[slot] = binaryDocValues == null ? null : binaryDocValues.get(doc).utf8ToString();
     }
 
     @Override
     protected void doSetNextReader(LeafReaderContext context) throws IOException {
         binaryDocValues = context.reader().getBinaryDocValues(fieldname);
         if (binaryDocValues == null) {
-            throw new IllegalStateException("索引中不存在 binaryDocValues ：" + fieldname);
+            logger.error("索引中不存在 binaryDocValues ：" + fieldname);
         }
     }
 
@@ -78,13 +82,13 @@ abstract class DefaultFieldComparator extends SimpleFieldComparator<String> {
 
     @Override
     public int compareBottom(int doc) throws IOException {
-        String value = binaryDocValues.get(doc).utf8ToString();
+        String value = binaryDocValues == null ? null : binaryDocValues.get(doc).utf8ToString();
         return compare(bottom, value);
     }
 
     @Override
     public int compareTop(int doc) throws IOException {
-        String value = binaryDocValues.get(doc).utf8ToString();
+        String value = binaryDocValues == null ? null : binaryDocValues.get(doc).utf8ToString();
         return compare(top, value);
     }