Github user peter-toth commented on a diff in the pull request:
https://github.com/apache/spark/pull/22318#discussion_r215571480
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/AttributeMap.scala
---
@@ -23,12 +23,14 @@ package org.apache.spark.sql.catalyst.expressions
* of the name, or the expected nullability).
*/
object AttributeMap {
+ val empty = new AttributeMap(Map.empty)
--- End diff --
Reverted to the previous one where we have one val in ResolveReferences.
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