Remove testImplicits object from QueryTestBase

Co-authored-by: Isaac

Author: zhengruifeng

sql/core/src/test/scala/org/apache/spark/sql/QueryTest.scala

@@ -42,7 +42,6 @@ import org.apache.spark.sql.catalyst.plans._
 import org.apache.spark.sql.catalyst.plans.PlanTest
 import org.apache.spark.sql.catalyst.plans.logical.LogicalPlan
 import org.apache.spark.sql.catalyst.util._
-import org.apache.spark.sql.classic.{ClassicConversions, ColumnConversions, ColumnNodeToExpressionConverter, SQLImplicits}
 import org.apache.spark.sql.classic.ClassicConversions._
 import org.apache.spark.sql.execution.{FilterExec, QueryExecution, SQLExecution}
 import org.apache.spark.sql.execution.adaptive.DisableAdaptiveExecution
@@ -77,23 +76,6 @@ trait QueryTestBase extends PlanTestBase
   // Shorthand for running a query using our SparkSession
   protected lazy val sql: String => DataFrame = spark.sql _
 
-  /**
-   * A helper object for importing SQL implicits.
-   *
-   * Note that the alternative of importing `spark.implicits._` is not possible here.
-   * This is because we create the `SparkSession` immediately before the first test is run,
-   * but the implicits import is needed in the constructor.
-   */
-  protected object testImplicits
-    extends SQLImplicits
-      with ClassicConversions
-      with ColumnConversions {
-    private def classicSession: classic.SparkSession =
-      self.spark.asInstanceOf[classic.SparkSession]
-    override protected def session: classic.SparkSession = classicSession
-    override protected def converter: ColumnNodeToExpressionConverter = classicSession.converter
-  }
-
   protected override def withSQLConf[T](pairs: (String, String)*)(f: => T): T = {
     SparkSession.setActiveSession(spark)
     super.withSQLConf(pairs: _*)(f)