AngersZhuuuu commented on a change in pull request #33082:
URL: https://github.com/apache/spark/pull/33082#discussion_r659189132
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
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@@ -1766,19 +1766,20 @@ object CodeGenerator extends Logging {
argSet += JavaCode.variable(ctx.INPUT_ROW, classOf[InternalRow])
}
+ val stack = mutable.Stack[Expression](expr)
+
// Collects local variables from a given `expr` tree
- val collectLocalVariable = (ev: ExprValue) => ev match {
+ val collectLocalVariable = (ev: ExprValue, e: Expression) => ev match {
case vv: VariableValue => argSet += vv
- case _ =>
+ case _ => stack.pushAll(e.children)
}
- val stack = mutable.Stack[Expression](expr)
while (stack.nonEmpty) {
stack.pop() match {
case e if subExprs.contains(e) =>
val SubExprEliminationState(isNull, value) = subExprs(e)
- collectLocalVariable(value)
- collectLocalVariable(isNull)
+ collectLocalVariable(value, e)
+ collectLocalVariable(isNull, e)
Review comment:
> Oh, some `SubExprEliminationState` contains not `VariableValue` but
still some statements that includes other expressions?
Yes, the expression contains input var may match `SubExprEliminationState`
and just skiped.
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