fix comments

Author: steFaiz

paimon-common/src/main/java/org/apache/paimon/utils/RowRangeIndex.java

@@ -55,16 +55,6 @@ public List<Range> ranges() {
         return Collections.unmodifiableList(ranges);
     }
 
-    public boolean contains(long start, long end) {
-        int candidate = lowerBound(ends, start);
-        return candidate < starts.length && starts[candidate] <= start && ends[candidate] >= end;
-    }
-
-    public boolean containsExactly(long start, long end) {
-        int candidate = lowerBound(starts, start);
-        return candidate < starts.length && starts[candidate] == start && ends[candidate] == end;
-    }
-
     public boolean intersects(long start, long end) {
         int candidate = lowerBound(ends, start);
         return candidate < starts.length && starts[candidate] <= end;
@@ -77,6 +67,13 @@ public boolean contains(Range range) {
                 && ends[candidate] >= range.to;
     }
 
+    public boolean containsExactly(Range range) {
+        int candidate = lowerBound(starts, range.from);
+        return candidate < starts.length
+                && starts[candidate] == range.from
+                && ends[candidate] == range.to;
+    }
+
     public List<Range> intersectedRanges(long start, long end) {
         int left = lowerBound(ends, start);
         if (left >= ranges.size()) {

paimon-core/src/main/java/org/apache/paimon/operation/commit/ConflictDetection.java

@@ -644,11 +644,11 @@ Optional<RuntimeException> checkRowIdExistence(
         RowRangeIndex existingIndex = RowRangeIndex.create(existingRanges, false);
 
         for (SimpleFileEntry entry : filesToCheck) {
-            long rowRangeEnd = entry.firstRowId() + entry.rowCount() - 1;
+            Range rowRange = entry.nonNullRowIdRange();
             boolean exists =
                     dedicatedStorageFile(entry.fileName())
-                            ? existingIndex.contains(entry.firstRowId(), rowRangeEnd)
-                            : existingIndex.containsExactly(entry.firstRowId(), rowRangeEnd);
+                            ? existingIndex.contains(rowRange)
+                            : existingIndex.containsExactly(rowRange);
             if (!exists) {
                 return Optional.of(
                         new RuntimeException(