Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/22318#discussion_r215252360 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -754,11 +754,16 @@ class Analyzer( * a logical plan node's children. */ object ResolveReferences extends Rule[LogicalPlan] { + + private val emptyAttrMap = new AttributeMap[Attribute](Map.empty) --- End diff -- its ok to me.
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