Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19813#discussion_r154948628
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -115,9 +120,35 @@ abstract class Expression extends TreeNode[Expression]
{
}
}
+ /**
+ * Returns the input variables to this expression.
+ */
+ private def findInputVars(ctx: CodegenContext, eval: ExprCode):
Seq[ExprInputVar] = {
+ if (ctx.currentVars != null) {
+ val boundRefs = this.collect {
+ case b @ BoundReference(ordinal, _, _) if ctx.currentVars(ordinal)
!= null => (ordinal, b)
+ }.toMap
+
+ ctx.currentVars.zipWithIndex.filter(_._1 != null).flatMap { case
(currentVar, idx) =>
--- End diff --
Why these codes? to make sure the returned input vars follow the same order
in `ctx.currentVars`?
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