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_r410257658
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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) {
Review comment:
There is already one case for when the name is a Java keyword, this is the
case when the name starts with a number, also possible in Scala but not in
Java. I think it is better to "customize" exceptions explaining why the input
cannot be like that, than having the exception with 0 information and the user
without knowing what to do.
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