panbingkun commented on code in PR #45851:
URL: https://github.com/apache/spark/pull/45851#discussion_r1549642894


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala:
##########
@@ -1561,9 +1562,9 @@ object CodeGenerator extends Logging {
   private def logGeneratedCode(code: CodeAndComment): Unit = {
     val maxLines = SQLConf.get.loggingMaxLinesForCodegen
     if (Utils.isTesting) {
-      logError(s"\n${CodeFormatter.format(code, maxLines)}")
+      logError(log"\n${MDC(FORMATTED_CODE, CodeFormatter.format(code, 
maxLines))}")

Review Comment:
   > Sorry let me just ask some dumb question for my personal understanding. 
Then how about this case?
   > 
   > 
https://github.com/apache/spark/blob/d487acd3008b6e8e9624295c833a6f87c1102ce9/sql/hive/src/main/scala/org/apache/spark/sql/hive/TableReader.scala#L520-L522
   > 
   > Can we use `logKey` maybe something like `FIELD_NAME`??
   
   Yeah



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