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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