Github user rxin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/12353#discussion_r59506777
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
 ---
    @@ -52,6 +52,8 @@ case class ExprCode(var code: String, var isNull: String, 
var value: String)
      */
     class CodegenContext {
     
    +  var conf: CatalystConf = null
    --- End diff --
    
    this is really hacky -- i'd put this in the constructor and make it a val 
rather than a var. and maybe we can create a CodegenConf instead of reusing 
CatalystConf?



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