marin-ma commented on code in PR #12471:
URL: https://github.com/apache/gluten/pull/12471#discussion_r3802478792


##########
backends-velox/src/test/scala/org/apache/gluten/execution/CudfBroadcastJoinSuite.scala:
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@@ -0,0 +1,103 @@
+/*
+ * 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.gluten.execution
+
+import org.apache.spark.SparkConf
+
+/**
+ * Regression tests for GLUTEN-12471: broadcast hash joins on the cuDF (GPU) 
backend silently
+ * returned empty results because CudfHashJoin built its hash table from the 
empty build-side
+ * iterator instead of the prebuilt CPU table.
+ *
+ * These tests require GPU hardware and a cuDF-enabled build, so they are 
skipped unless the env var
+ * GLUTEN_TEST_CUDF=1 is set. Run on a GPU host:
+ *
+ * GLUTEN_TEST_CUDF=1 mvn test -Pbackends-velox \
+ * -DwildcardSuites=org.apache.gluten.execution.CudfBroadcastJoinSuite
+ */
+class CudfBroadcastJoinSuite extends VeloxWholeStageTransformerSuite {
+
+  override protected val resourcePath: String = "/tpch-data-parquet"
+  override protected val fileFormat: String = "parquet"
+
+  private def cudfEnabled: Boolean = 
sys.env.get("GLUTEN_TEST_CUDF").contains("1")

Review Comment:
   Let's not use environment variable to control. You can create a new tag 
`CudfTest` in backends-velox/src/test/java/org/apache/gluten/tags and append 
the tag to `-DtagsToExclude` in the CI files.



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