PedroCorreiaLuis commented on a change in pull request #26319: 
[SPARK-29594][SQL] Create a Dataset from a Sequence of Case class where…
URL: https://github.com/apache/spark/pull/26319#discussion_r340817033
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
 ##########
 @@ -543,6 +543,12 @@ object ScalaReflection extends ScalaReflection {
             throw new UnsupportedOperationException(s"`$fieldName` is a 
reserved keyword and " +
               "cannot be used as field name\n" + walkedTypePath)
           }
+          // It is ok to use head here because a variable name needs to be non 
empty
+          if (fieldName.head.isDigit) {
+            throw new UnsupportedOperationException(s"`$fieldName` is a word 
that starts with a " +
+              "number and cannot be used as field name" + "A work around to 
this problem is to " +
 
 Review comment:
   Done

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