HyukjinKwon commented on a change in pull request #26319:
URL: https://github.com/apache/spark/pull/26319#discussion_r481930058
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
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@@ -543,6 +543,13 @@ object ScalaReflection extends ScalaReflection {
throw new UnsupportedOperationException(s"`$fieldName` is a
reserved keyword and " +
"cannot be used as field name\n" + walkedTypePath)
}
+ // It is ok to use head here because a variable name needs to be non
empty
+ if (!Character.isJavaIdentifierStart(fieldName.head)) {
+ throw new UnsupportedOperationException(s"`$fieldName` is a word
that starts with" +
+ " a character not allowed in Java and cannot be used as field
name. " +
+ "A workaround to this problem is to convert the case class to
Json" +
Review comment:
Json -> JSON
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