diff --git a/spark/src/test/scala/org/apache/spark/sql/benchmark/CometBroadcastHashJoinBenchmark.scala b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometBroadcastHashJoinBenchmark.scala
new file mode 100644
index 0000000000..bcbb3afca5
--- /dev/null
+++ b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometBroadcastHashJoinBenchmark.scala
@@ -0,0 +1,122 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.spark.sql.benchmark
+
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.internal.SQLConf
+
+import org.apache.comet.CometSparkSessionExtensions
+
+/**
+ * Benchmark to measure performance of Comet's BroadcastHashJoin across common Spark join shapes
+ * (Inner count, Inner projected, LEFT OUTER, LEFT SEMI, RIGHT OUTER). To run:
+ * {{{
+ *   SPARK_GENERATE_BENCHMARK_FILES=1 make benchmark-org.apache.spark.sql.benchmark.CometBroadcastHashJoinBenchmark
+ * }}}
+ */
+object CometBroadcastHashJoinBenchmark extends CometBenchmarkBase {
+
+  override def getSparkSession: SparkSession = {
+    val conf = new SparkConf()
+      .setAppName("CometBroadcastHashJoinBenchmark")
+      .set("spark.master", "local[5]")
+      .setIfMissing("spark.driver.memory", "3g")
+      .setIfMissing("spark.executor.memory", "3g")
+      .set(
+        "spark.shuffle.manager",
+        "org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager")
+
+    val sparkSession = SparkSession.builder
+      .config(conf)
+      .withExtensions(new CometSparkSessionExtensions)
+      .getOrCreate()
+    sparkSession.conf.set("spark.sql.shuffle.partitions", "2")
+    sparkSession
+  }
+
+  // Force BroadcastHashJoin: small build below the 10MB threshold.
+  private val cometConfigs: Map[String, String] = Map(
+    SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "10MB",
+    SQLConf.ADAPTIVE_AUTO_BROADCASTJOIN_THRESHOLD.key -> "10MB")
+
+  override def runCometBenchmark(mainArgs: Array[String]): Unit = {
+    val probeRows = 1024 * 1024
+    val buildRows = 100000
+
+    withTempPath { dir =>
+      withTempTable("probe", "build") {
+        spark
+          .range(probeRows)
+          .selectExpr("id AS k", "id % 100 AS v")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/probe")
+        spark
+          .range(buildRows)
+          .selectExpr("id AS k", "id * 10 AS w")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/build")
+
+        spark.read.parquet(s"${dir.getAbsolutePath}/probe").createOrReplaceTempView("probe")
+        spark.read.parquet(s"${dir.getAbsolutePath}/build").createOrReplaceTempView("build")
+
+        runBenchmark("BroadcastHashJoin - inner count") {
+          runExpressionBenchmark(
+            "inner count",
+            probeRows,
+            "SELECT /*+ BROADCAST(b) */ count(*) FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("BroadcastHashJoin - inner projected") {
+          runExpressionBenchmark(
+            "inner projected",
+            probeRows,
+            "SELECT /*+ BROADCAST(b) */ p.k, p.v, b.w FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("BroadcastHashJoin - left outer") {
+          runExpressionBenchmark(
+            "left outer",
+            probeRows,
+            "SELECT /*+ BROADCAST(b) */ count(*) FROM probe p LEFT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("BroadcastHashJoin - left semi") {
+          runExpressionBenchmark(
+            "left semi",
+            probeRows,
+            "SELECT /*+ BROADCAST(b) */ count(*) FROM probe p LEFT SEMI JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("BroadcastHashJoin - right outer") {
+          runExpressionBenchmark(
+            "right outer",
+            probeRows,
+            "SELECT /*+ BROADCAST(p) */ count(*) FROM probe p RIGHT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+      }
+    }
+  }
+}
diff --git a/spark/src/test/scala/org/apache/spark/sql/benchmark/CometHashJoinBenchmark.scala b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometHashJoinBenchmark.scala
new file mode 100644
index 0000000000..d98b20284b
--- /dev/null
+++ b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometHashJoinBenchmark.scala
@@ -0,0 +1,129 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.spark.sql.benchmark
+
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.internal.SQLConf
+
+import org.apache.comet.{CometConf, CometSparkSessionExtensions}
+
+/**
+ * Benchmark to measure performance of Comet's ShuffledHashJoin across common Spark join shapes
+ * (Inner count, Inner projected, LEFT OUTER, LEFT SEMI, RIGHT OUTER). To run:
+ * {{{
+ *   SPARK_GENERATE_BENCHMARK_FILES=1 make benchmark-org.apache.spark.sql.benchmark.CometHashJoinBenchmark
+ * }}}
+ */
+object CometHashJoinBenchmark extends CometBenchmarkBase {
+
+  override def getSparkSession: SparkSession = {
+    val conf = new SparkConf()
+      .setAppName("CometHashJoinBenchmark")
+      .set("spark.master", "local[5]")
+      .setIfMissing("spark.driver.memory", "3g")
+      .setIfMissing("spark.executor.memory", "3g")
+      .set(
+        "spark.shuffle.manager",
+        "org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager")
+
+    val sparkSession = SparkSession.builder
+      .config(conf)
+      .withExtensions(new CometSparkSessionExtensions)
+      .getOrCreate()
+
+    sparkSession.conf.set(CometConf.COMET_ENABLED.key, "false")
+    sparkSession.conf.set(CometConf.COMET_EXEC_ENABLED.key, "false")
+    sparkSession.conf.set(SQLConf.ANSI_ENABLED.key, "false")
+    sparkSession.conf.set("spark.sql.shuffle.partitions", "2")
+
+    sparkSession
+  }
+
+  // Force ShuffledHashJoin: disable broadcast and prefer-SMJ, enable force-SHJ.
+  private val cometConfigs: Map[String, String] = Map(
+    SQLConf.PREFER_SORTMERGEJOIN.key -> "false",
+    "spark.sql.join.forceApplyShuffledHashJoin" -> "true",
+    SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1",
+    SQLConf.ADAPTIVE_AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1")
+
+  override def runCometBenchmark(mainArgs: Array[String]): Unit = {
+    val probeRows = 1024 * 1024
+    val buildRows = 100000
+
+    withTempPath { dir =>
+      withTempTable("probe", "build") {
+        spark
+          .range(probeRows)
+          .selectExpr("id AS k", "id % 100 AS v")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/probe")
+        spark
+          .range(buildRows)
+          .selectExpr("id AS k", "id * 10 AS w")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/build")
+
+        spark.read.parquet(s"${dir.getAbsolutePath}/probe").createOrReplaceTempView("probe")
+        spark.read.parquet(s"${dir.getAbsolutePath}/build").createOrReplaceTempView("build")
+
+        runBenchmark("ShuffledHashJoin - inner count") {
+          runExpressionBenchmark(
+            "inner count",
+            probeRows,
+            "SELECT /*+ SHUFFLE_HASH(b) */ count(*) FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("ShuffledHashJoin - inner projected") {
+          runExpressionBenchmark(
+            "inner projected",
+            probeRows,
+            "SELECT /*+ SHUFFLE_HASH(b) */ p.k, p.v, b.w FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("ShuffledHashJoin - left outer") {
+          runExpressionBenchmark(
+            "left outer",
+            probeRows,
+            "SELECT /*+ SHUFFLE_HASH(b) */ count(*) FROM probe p LEFT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("ShuffledHashJoin - left semi") {
+          runExpressionBenchmark(
+            "left semi",
+            probeRows,
+            "SELECT /*+ SHUFFLE_HASH(b) */ count(*) FROM probe p LEFT SEMI JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("ShuffledHashJoin - right outer") {
+          runExpressionBenchmark(
+            "right outer",
+            probeRows,
+            "SELECT /*+ SHUFFLE_HASH(p) */ count(*) FROM probe p RIGHT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+      }
+    }
+  }
+}
diff --git a/spark/src/test/scala/org/apache/spark/sql/benchmark/CometSortMergeJoinBenchmark.scala b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometSortMergeJoinBenchmark.scala
new file mode 100644
index 0000000000..2b4272cdab
--- /dev/null
+++ b/spark/src/test/scala/org/apache/spark/sql/benchmark/CometSortMergeJoinBenchmark.scala
@@ -0,0 +1,128 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.spark.sql.benchmark
+
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.SparkSession
+import org.apache.spark.sql.internal.SQLConf
+
+import org.apache.comet.{CometConf, CometSparkSessionExtensions}
+
+/**
+ * Benchmark to measure performance of Comet's SortMergeJoin across common Spark join shapes
+ * (Inner count, Inner projected, LEFT OUTER, LEFT SEMI, RIGHT OUTER). To run:
+ * {{{
+ *   SPARK_GENERATE_BENCHMARK_FILES=1 make benchmark-org.apache.spark.sql.benchmark.CometSortMergeJoinBenchmark
+ * }}}
+ */
+object CometSortMergeJoinBenchmark extends CometBenchmarkBase {
+
+  override def getSparkSession: SparkSession = {
+    val conf = new SparkConf()
+      .setAppName("CometSortMergeJoinBenchmark")
+      .set("spark.master", "local[5]")
+      .setIfMissing("spark.driver.memory", "3g")
+      .setIfMissing("spark.executor.memory", "3g")
+      .set(
+        "spark.shuffle.manager",
+        "org.apache.spark.sql.comet.execution.shuffle.CometShuffleManager")
+
+    val sparkSession = SparkSession.builder
+      .config(conf)
+      .withExtensions(new CometSparkSessionExtensions)
+      .getOrCreate()
+
+    sparkSession.conf.set(CometConf.COMET_ENABLED.key, "false")
+    sparkSession.conf.set(CometConf.COMET_EXEC_ENABLED.key, "false")
+    sparkSession.conf.set(SQLConf.ANSI_ENABLED.key, "false")
+    sparkSession.conf.set("spark.sql.shuffle.partitions", "2")
+
+    sparkSession
+  }
+
+  // Force SortMergeJoin: prefer SMJ, disable broadcast.
+  private val cometConfigs: Map[String, String] = Map(
+    SQLConf.PREFER_SORTMERGEJOIN.key -> "true",
+    SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1",
+    SQLConf.ADAPTIVE_AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1")
+
+  override def runCometBenchmark(mainArgs: Array[String]): Unit = {
+    val probeRows = 1024 * 1024
+    val buildRows = 100000
+
+    withTempPath { dir =>
+      withTempTable("probe", "build") {
+        spark
+          .range(probeRows)
+          .selectExpr("id AS k", "id % 100 AS v")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/probe")
+        spark
+          .range(buildRows)
+          .selectExpr("id AS k", "id * 10 AS w")
+          .write
+          .parquet(s"${dir.getAbsolutePath}/build")
+
+        spark.read.parquet(s"${dir.getAbsolutePath}/probe").createOrReplaceTempView("probe")
+        spark.read.parquet(s"${dir.getAbsolutePath}/build").createOrReplaceTempView("build")
+
+        runBenchmark("SortMergeJoin - inner count") {
+          runExpressionBenchmark(
+            "inner count",
+            probeRows,
+            "SELECT /*+ MERGE(b) */ count(*) FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("SortMergeJoin - inner projected") {
+          runExpressionBenchmark(
+            "inner projected",
+            probeRows,
+            "SELECT /*+ MERGE(b) */ p.k, p.v, b.w FROM probe p JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("SortMergeJoin - left outer") {
+          runExpressionBenchmark(
+            "left outer",
+            probeRows,
+            "SELECT /*+ MERGE(b) */ count(*) FROM probe p LEFT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("SortMergeJoin - left semi") {
+          runExpressionBenchmark(
+            "left semi",
+            probeRows,
+            "SELECT /*+ MERGE(b) */ count(*) FROM probe p LEFT SEMI JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+
+        runBenchmark("SortMergeJoin - right outer") {
+          runExpressionBenchmark(
+            "right outer",
+            probeRows,
+            "SELECT /*+ MERGE(p) */ count(*) FROM probe p RIGHT JOIN build b ON p.k = b.k",
+            cometConfigs)
+        }
+      }
+    }
+  }
+}