Add test.

Author: viirya

sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/CodegenObjectFactorySuite.scala

@@ -0,0 +1,57 @@
+/*
+ * 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.catalyst.expressions
+
+import org.apache.spark.SparkFunSuite
+import org.apache.spark.sql.catalyst.plans.PlanTestBase
+import org.apache.spark.sql.internal.SQLConf
+import org.apache.spark.sql.types.{IntegerType, LongType}
+
+class CodegenObjectFactorySuite extends SparkFunSuite with PlanTestBase {
+
+  // Given a factory object and corresponding input, checking if `SQLConf.CODEGEN_OBJECT_FALLBACK`
+  // can switch between codegen/interpreted implementation.
+  private def testCodegenFactory[IN, OUT](factory: CodegenObjectFactory[IN, OUT],
+      input: IN, checkerForCodegen: OUT => Unit, checkerForInterpreted: OUT => Unit) = {
+
+    val modes = Seq("codegen-only", "interpreted-only")
+      .zip(Seq(checkerForCodegen, checkerForInterpreted))
+
+    for ((fallbackMode, checker) <- modes) {
+      withSQLConf(SQLConf.CODEGEN_OBJECT_FALLBACK.key -> fallbackMode) {
+        val obj = factory.createObject(input)
+        checker(obj)
+      }
+    }
+  }
+
+  test("test UnsafeProjection factory") {
+    val input = Seq(LongType, IntegerType)
+      .zipWithIndex.map(x => BoundReference(x._2, x._1, true))
+
+    def checkerForCodegen(projection: UnsafeProjection): Unit = {
+      assert(projection.getClass.getName.contains("GeneratedClass$SpecificUnsafeProjection"))
+    }
+
+    def checkerForInterpreted(projection: UnsafeProjection): Unit = {
+      assert(projection.isInstanceOf[InterpretedUnsafeProjection])
+    }
+
+    testCodegenFactory(UnsafeProjection, input, checkerForCodegen, checkerForInterpreted)
+  }
+}