diff --git a/tsfile/src/main/java/org/apache/tsfile/write/record/Tablet.java b/tsfile/src/main/java/org/apache/tsfile/write/record/Tablet.java
index c16bfa2eb..943b5a3cd 100644
--- a/tsfile/src/main/java/org/apache/tsfile/write/record/Tablet.java
+++ b/tsfile/src/main/java/org/apache/tsfile/write/record/Tablet.java
@@ -606,6 +606,15 @@ public static Object[] readTabletValuesFromBuffer(
     return values;
   }
 
+  /**
+   * Note that the function will judge 2 tablets to be equal when their contents are logically the
+   * same. Namely, a tablet with bitmap "null" may be equal to another tablet with 3 columns and
+   * bitmap "[null, null, null]", and a tablet with rowSize 2 is judged identical to other tablets
+   * regardless of any timeStamps with indexes larger than or equal to 2.
+   *
+   * @param o the tablet to compare
+   * @return true if the tablets are logically equal
+   */
   @Override
   public boolean equals(Object o) {
     if (this == o) {
@@ -756,8 +765,21 @@ private boolean isBitMapsEqual(BitMap[] thisBitMaps, BitMap[] thatBitMaps, int c
     if (thisBitMaps == thatBitMaps) {
       return true;
     }
-    if (thisBitMaps == null || thatBitMaps == null) {
-      return false;
+    if (thisBitMaps == null) {
+      for (int i = 0; i < columns; i++) {
+        if (thatBitMaps[i] != null) {
+          return false;
+        }
+      }
+      return true;
+    }
+    if (thatBitMaps == null) {
+      for (int i = 0; i < columns; i++) {
+        if (thisBitMaps[i] != null) {
+          return false;
+        }
+      }
+      return true;
     }
 
     for (int i = 0; i < columns; i++) {