Revert changes to BatchEvalPythonExecSuite

Author: icexelloss

sql/core/src/test/scala/org/apache/spark/sql/execution/python/BatchEvalPythonExecSuite.scala

@@ -23,19 +23,17 @@ import scala.collection.mutable.ArrayBuffer
 import org.apache.spark.api.python.{PythonEvalType, PythonFunction}
 import org.apache.spark.sql.catalyst.FunctionIdentifier
 import org.apache.spark.sql.catalyst.expressions.{And, AttributeReference, GreaterThan, In}
-import org.apache.spark.sql.execution._
+import org.apache.spark.sql.execution.{FilterExec, InputAdapter, SparkPlanTest, WholeStageCodegenExec}
 import org.apache.spark.sql.test.SharedSQLContext
 import org.apache.spark.sql.types.BooleanType
 
 class BatchEvalPythonExecSuite extends SparkPlanTest with SharedSQLContext {
   import testImplicits.newProductEncoder
   import testImplicits.localSeqToDatasetHolder
 
-  val pythonUDF = new MyDummyPythonUDF
-
   override def beforeAll(): Unit = {
     super.beforeAll()
-    spark.udf.registerPython("dummyPythonUDF", pythonUDF)
+    spark.udf.registerPython("dummyPythonUDF", new MyDummyPythonUDF)
   }
 
   override def afterAll(): Unit = {