chore: experiment to obtain rule output plan

Author: comphead

spark/src/main/scala/org/apache/comet/rules/CometExecRule.scala

@@ -357,10 +357,12 @@ case class CometExecRule(session: SparkSession) extends Rule[SparkPlan] {
   override def apply(plan: SparkPlan): SparkPlan = {
     val newPlan = _apply(plan)
     if (showTransformations && !newPlan.fastEquals(plan)) {
-      logInfo(s"""
+      // scalastyle:off println
+      println(s"""
            |=== Applying Rule $ruleName ===
            |${sideBySide(plan.treeString, newPlan.treeString).mkString("\n")}
            |""".stripMargin)
+      // scalastyle:on println
     }
     newPlan
   }

spark/src/main/scala/org/apache/comet/rules/CometScanRule.scala

@@ -65,10 +65,12 @@ case class CometScanRule(session: SparkSession)
   override def apply(plan: SparkPlan): SparkPlan = {
     val newPlan = _apply(plan)
     if (showTransformations && !newPlan.fastEquals(plan)) {
-      logInfo(s"""
+      // scalastyle:off println
+      println(s"""
            |=== Applying Rule $ruleName ===
            |${sideBySide(plan.treeString, newPlan.treeString).mkString("\n")}
            |""".stripMargin)
+      // scalastyle:on println
     }
     newPlan
   }

spark/src/test/scala/org/apache/comet/parquet/CometParquetWriterSuite.scala

@@ -69,6 +69,7 @@ class CometParquetWriterSuite extends CometTestBase {
 
         withSQLConf(
           CometConf.COMET_NATIVE_PARQUET_WRITE_ENABLED.key -> "true",
+          CometConf.COMET_EXPLAIN_TRANSFORMATIONS.key -> "true",
           SQLConf.SESSION_LOCAL_TIMEZONE.key -> "America/Halifax",
           CometConf.COMET_OPERATOR_DATA_WRITING_COMMAND_ALLOW_INCOMPAT.key -> "true",
           CometConf.COMET_EXEC_ENABLED.key -> "true") {