fix

Author: tianchen92

java/vector/src/main/java/org/apache/arrow/vector/BaseFixedWidthVector.java

@@ -876,7 +876,7 @@ public boolean equals(int index, ValueVector to, int toIndex) {
 
     BaseFixedWidthVector that = (BaseFixedWidthVector) to;
 
-    if (this.isSet(index) != that.isSet(index)) {
+    if (this.isSet(index) != that.isSet(toIndex)) {
       return false;
     }
 

java/vector/src/main/java/org/apache/arrow/vector/BaseVariableWidthVector.java

@@ -1375,7 +1375,7 @@ public boolean equals(int index, ValueVector to, int toIndex) {
 
     BaseVariableWidthVector that = (BaseVariableWidthVector) to;
 
-    if (this.isSet(index) != that.isSet(index)) {
+    if (this.isSet(index) != that.isSet(toIndex)) {
       return false;
     }