use trait

Author: Eric5553

sql/core/src/main/scala/org/apache/spark/sql/execution/python/EvalPythonExec.scala

@@ -57,7 +57,7 @@ import org.apache.spark.util.Utils
  * there should be always some rows buffered in the socket or Python process, so the pulling from
  * RowQueue ALWAYS happened after pushing into it.
  */
-abstract class EvalPythonExec extends UnaryExecNode {
+trait EvalPythonExec extends UnaryExecNode {
   def udfs: Seq[PythonUDF]
   def resultAttrs: Seq[Attribute]
 

sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowExecBase.scala

@@ -26,7 +26,7 @@ import org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression
 import org.apache.spark.sql.execution.{SparkPlan, UnaryExecNode}
 import org.apache.spark.sql.types.{CalendarIntervalType, DateType, IntegerType, TimestampType}
 
-abstract class WindowExecBase extends UnaryExecNode {
+trait WindowExecBase extends UnaryExecNode {
   def windowExpression: Seq[NamedExpression]
   def partitionSpec: Seq[Expression]
   def orderSpec: Seq[SortOrder]