Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/21552#discussion_r195894982 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveSessionCatalog.scala --- @@ -131,6 +132,8 @@ private[sql] class HiveSessionCatalog( Try(super.lookupFunction(funcName, children)) match { case Success(expr) => expr case Failure(error) => + logWarning(s"Encounter a failure during looking up function:" + + s" ${Utils.exceptionString(error)}") if (functionRegistry.functionExists(funcName)) { --- End diff -- How about `logWarning(s"Failed to look up a function: $funcName")`? I feel printing `Utils.exceptionString(error)` is a little meaningless.
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