maropu commented on a change in pull request #25766: [SPARK-29061][SQL] Prints 
bytecode statistics in debugCodegen
URL: https://github.com/apache/spark/pull/25766#discussion_r324141740
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
 ##########
 @@ -1211,6 +1211,16 @@ abstract class CodeGenerator[InType <: AnyRef, OutType 
<: AnyRef] extends Loggin
   }
 }
 
+/**
+ * Java bytecode statistics of a compiled class by Janino.
+ */
+case class ByteCodeStats(
+  maxClassCodeSize: Int, maxMethodCodeSize: Int, maxConstPoolSize: Int, 
numInnerClasses: Int)
 
 Review comment:
   The current code just collects the max code size among a compiled class and 
inner classes. But, on second thoughs, I think now we don't need to print the 
class size cuz IIUC the size is not related to the JVM limits: 
https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.11
   
   https://github.com/apache/spark/pull/25766#discussion_r324052815
   WDYT? @kiszk 

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