Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18544#discussion_r202257183
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
 ---
    @@ -1155,7 +1155,8 @@ class Analyzer(
         override def apply(plan: LogicalPlan): LogicalPlan = 
plan.transformAllExpressions {
           case f: UnresolvedFunction if !catalog.functionExists(f.name) =>
             withPosition(f) {
    -          throw new 
NoSuchFunctionException(f.name.database.getOrElse("default"), f.name.funcName)
    +          val db = f.name.database.getOrElse(catalog.getCurrentDatabase)
    +          throw new NoSuchFunctionException(db, f.name.funcName)
    --- End diff --
    
    The issue has been resolved. Can you revert the changes?


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