Github user peter-toth commented on a diff in the pull request:
https://github.com/apache/spark/pull/22318#discussion_r215571667
--- 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)
+
def apply[A](kvs: Seq[(Attribute, A)]): AttributeMap[A] = {
new AttributeMap(kvs.map(kv => (kv._1.exprId, kv)).toMap)
}
}
-class AttributeMap[A](val baseMap: Map[ExprId, (Attribute, A)])
+class AttributeMap[+A](val baseMap: Map[ExprId, (Attribute, A)])
--- End diff --
done
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