Github user nongli commented on a diff in the pull request: https://github.com/apache/spark/pull/9480#discussion_r44190096 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala --- @@ -341,7 +440,18 @@ abstract class CodeGenerator[InType <: AnyRef, OutType <: AnyRef] extends Loggin protected def declareMutableStates(ctx: CodeGenContext): String = { ctx.mutableStates.map { case (javaType, variableName, _) => s"private $javaType $variableName;" - }.mkString("\n") + }.mkString("\n") + "\n" + + // Maintain the loaded value and isNull as member variables. This is necessary if the codegen + // function is split across multiple functions. + // TODO: maintaining this as a local variable probably allows the compiler to do better + // optimizations. + ctx.subExprEliminationStates.map { s => { --- End diff -- I changed this code to just use mutable state.
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