Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/13505#discussion_r65792692
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/BoundAttribute.scala
---
@@ -84,17 +84,27 @@ object BindReferences extends Logging {
expression: A,
input: Seq[Attribute],
--- End diff --
I wonder whether we can push the map construction up one level so that we
can amortize its cost across multiple `bindReference` calls.
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