Update DualKeyCacheImpl.java

Author: Caideyipi

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/analyze/cache/schema/dualkeycache/impl/DualKeyCacheImpl.java

@@ -84,6 +84,7 @@ public <R> boolean batchApply(
       if (cacheEntryGroup == null) {
         return false;
       }
+
       for (final Map.Entry<SK, R> skrEntry : fkMapEntry.getValue().entrySet()) {
         final T cacheEntry = cacheEntryGroup.getCacheEntry(skrEntry.getKey());
         if (cacheEntry == null) {
@@ -349,7 +350,6 @@ private long getEntriesCount() {
   private static class SegmentedConcurrentHashMap<K, V> {
 
     private static final int SLOT_NUM = 31;
-    private int size = 0;
     private final Map<K, V>[] maps = new ConcurrentHashMap[SLOT_NUM];
 
     V get(final K key) {