address comments.

Author: gatorsmile

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala

@@ -406,7 +406,7 @@ class Analyzer(
           }
         )
       case g: Generate if containsStar(g.generator.children) =>
-        failAnalysis("Cannot explode *, explode can only be applied on a specific column.")
+        failAnalysis("Invalid usage of '*' in explode/json_tuple/UDTF")
     }
 
     /**

sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala

@@ -178,8 +178,7 @@ class DataFrameSuite extends QueryTest with SharedSQLContext {
         csv.split(",").map(v => Tuple1(prefix + ":" + v)).toSeq
       }.queryExecution.assertAnalyzed()
     }
-    assert(e.getMessage.contains(
-      "Cannot explode *, explode can only be applied on a specific column."))
+    assert(e.getMessage.contains("Invalid usage of '*' in explode/json_tuple/UDTF"))
 
     df.explode('prefix, 'csv) { case Row(prefix: String, csv: String) =>
       csv.split(",").map(v => Tuple1(prefix + ":" + v)).toSeq