diff --git a/spark/src/main/scala/org/apache/spark/sql/comet/operators.scala b/spark/src/main/scala/org/apache/spark/sql/comet/operators.scala
index 63587af32..c2fb74a85 100644
--- a/spark/src/main/scala/org/apache/spark/sql/comet/operators.scala
+++ b/spark/src/main/scala/org/apache/spark/sql/comet/operators.scala
@@ -684,7 +684,7 @@ case class CometHashJoinExec(
     this.copy(left = newLeft, right = newRight)
 
   override def stringArgs: Iterator[Any] =
-    Iterator(leftKeys, rightKeys, joinType, condition, left, right)
+    Iterator(leftKeys, rightKeys, joinType, buildSide, condition, left, right)
 
   override def equals(obj: Any): Boolean = {
     obj match {
diff --git a/spark/src/test/scala/org/apache/comet/exec/CometJoinSuite.scala b/spark/src/test/scala/org/apache/comet/exec/CometJoinSuite.scala
index 91d88c76e..f29d43ab5 100644
--- a/spark/src/test/scala/org/apache/comet/exec/CometJoinSuite.scala
+++ b/spark/src/test/scala/org/apache/comet/exec/CometJoinSuite.scala
@@ -149,18 +149,27 @@ class CometJoinSuite extends CometTestBase {
           // Left join: build left
           // sql("SELECT /*+ SHUFFLE_HASH(tbl_a) */ * FROM tbl_a LEFT JOIN tbl_b ON tbl_a._2 = tbl_b._1")
 
-          // TODO: DataFusion HashJoin doesn't support build right yet.
           // Inner join: build right
-          // sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a JOIN tbl_b ON tbl_a._2 = tbl_b._1")
-          //
+          val df4 =
+            sql(
+              "SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a JOIN tbl_b ON tbl_a._2 = tbl_b._1")
+          checkSparkAnswerAndOperator(df4)
+
           // Left join: build right
-          // sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a LEFT JOIN tbl_b ON tbl_a._2 = tbl_b._1")
-          //
+          val df5 =
+            sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a LEFT JOIN tbl_b ON tbl_a._2 = tbl_b._1")
+          checkSparkAnswerAndOperator(df5)
+
           // Right join: build right
-          // sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a RIGHT JOIN tbl_b ON tbl_a._2 = tbl_b._1")
-          //
+          val df6 =
+            sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a RIGHT JOIN tbl_b ON tbl_a._2 = tbl_b._1")
+          checkSparkAnswerAndOperator(df6)
+
           // Full join: build right
-          // sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a FULL JOIN tbl_b ON tbl_a._2 = tbl_b._1")
+          val df7 =
+            sql("SELECT /*+ SHUFFLE_HASH(tbl_b) */ * FROM tbl_a FULL JOIN tbl_b ON tbl_a._2 = tbl_b._1")
+          checkSparkAnswerAndOperator(df7)
+
           //
           // val left = sql("SELECT * FROM tbl_a")
           // val right = sql("SELECT * FROM tbl_b")