karuppayya commented on a change in pull request #23696: 
[SPARK-26781][SQL]Avoid additional exchanges
URL: https://github.com/apache/spark/pull/23696#discussion_r252307851
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/namedExpressions.scala
 ##########
 @@ -24,6 +24,7 @@ import 
org.apache.spark.sql.catalyst.analysis.UnresolvedAttribute
 import org.apache.spark.sql.catalyst.expressions.codegen._
 import org.apache.spark.sql.catalyst.plans.logical.EventTimeWatermark
 import org.apache.spark.sql.catalyst.util.quoteIdentifier
+import org.apache.spark.sql.internal.SQLConf
 
 Review comment:
   Removed

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