[GitHub] [spark] dongjoon-hyun commented on a change in pull request #26319: [SPARK-29594][SQL] Create a Dataset from a Sequence of Case class where…

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dongjoon-hyun 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_r340807635
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
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 @@ -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:
   - `name"` -> `name."`
   - `work around` -> `workaround`.
   
   And, I guess we don't need to split there, `field name. A workaround is to convert " +`.

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