amanomer commented on a change in pull request #26712: [SPARK-29883][SQL] 
Improve error messages when function name is an alias
URL: https://github.com/apache/spark/pull/26712#discussion_r354207829
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
 ##########
 @@ -618,19 +618,36 @@ object FunctionRegistry {
           }
           throw new AnalysisException(invalidArgumentsMsg)
         }
-        Try(f.newInstance(expressions : _*).asInstanceOf[Expression]) match {
-          case Success(e) => e
-          case Failure(e) =>
-            // the exception is an invocation exception. To get a meaningful 
message, we need the
-            // cause.
-            throw new AnalysisException(e.getCause.getMessage)
+        try {
+          f.newInstance(expressions : _*).asInstanceOf[Expression]
+        } catch {
+          // the exception is an invocation exception. To get a meaningful 
message, we need the
+          // cause.
+          case e: Exception => throw new 
AnalysisException(e.getCause.getMessage)
         }
       }
     }
 
     (name, (expressionInfo[T](name), builder))
   }
 
+  private def expressionWithAlias[T <: Expression](name: String)
+      (implicit tag: ClassTag[T]): (String, (ExpressionInfo, FunctionBuilder)) 
= {
+    val constructors = tag.runtimeClass.getConstructors
+      .filter(_.getParameterTypes.head == classOf[String])
+    assert(constructors.length == 1)
+    val builder = (expressions: Seq[Expression]) => {
+      try {
+        constructors.head.newInstance(name.toString, 
expressions.head).asInstanceOf[Expression]
 
 Review comment:
   > is it possible to do newInstance(name.toString, expressions: _*)?
   
   No, compilation error.

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