panbingkun commented on code in PR #46193:
URL: https://github.com/apache/spark/pull/46193#discussion_r1578623558


##########
common/utils/src/test/scala/org/apache/spark/util/StructuredLoggingSuite.scala:
##########
@@ -144,6 +146,22 @@ trait LoggingSuiteBase
       }
   }
 
+  // An enumeration value that is not defined in `LogKey`, you can define it 
anywhere
+  private val externalLogKey = LogKey.VALUE
+  private val externalLog = log"${MDC(externalLogKey, "External log 
message.")}"
+  test("Logging with external LogKey") {

Review Comment:
   @gengliangwang 
   What do you think of the current modification approach?
   If we define it as `a string`, it feels like there is `no binding 
requirement` for `LogKey` at all
   Perhaps we need more eyes to review the changes above?



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