[GitHub] [spark] HyukjinKwon commented on a change in pull request #24136: [SPARK-27088][SQL] Add a configuration to set log level for each batch at RuleExecutor

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HyukjinKwon commented on a change in pull request #24136: [SPARK-27088][SQL]  Add a configuration to set log level for each batch at RuleExecutor
URL: https://github.com/apache/spark/pull/24136#discussion_r268602887
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/rules/RuleExecutor.scala
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 @@ -172,21 +164,41 @@ abstract class RuleExecutor[TreeType <: TreeNode[_]] extends Logging {
 
     private val logRules = SQLConf.get.optimizerPlanChangeRules.map(Utils.stringToSeq)
 
-    def log(ruleName: String, oldPlan: TreeType, newPlan: TreeType): Unit = {
+    private val logBatches = SQLConf.get.optimizerPlanChangeBatches.map(Utils.stringToSeq)
+
+    def logRule(ruleName: String, oldPlan: TreeType, newPlan: TreeType): Unit = {
       if (logRules.isEmpty || logRules.get.contains(ruleName)) {
         lazy val message =
           s"""
              |=== Applying Rule ${ruleName} ===
              |${sideBySide(oldPlan.treeString, newPlan.treeString).mkString("\n")}
            """.stripMargin
-        logLevel match {
-          case "TRACE" => logTrace(message)
-          case "DEBUG" => logDebug(message)
-          case "INFO" => logInfo(message)
-          case "WARN" => logWarning(message)
-          case "ERROR" => logError(message)
-          case _ => logTrace(message)
+        logBasedOnLevel(message)
+      }
+    }
+
+    def logBatch(batchName: String, oldPlan: TreeType, newPlan: TreeType): Unit = {
+      if (logBatches.isEmpty || logBatches.get.contains(batchName)) {
+        lazy val message = if (!oldPlan.fastEquals(newPlan)) {
 
 Review comment:
   Why is it `lazy`? Looks no point.

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