Github user fhueske commented on a diff in the pull request: https://github.com/apache/flink/pull/2500#discussion_r80237743 --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/codegen/CodeGenerator.scala --- @@ -545,7 +545,9 @@ class CodeGenerator( generateInputAccess(input._1, input._2, index) } - override def visitFieldAccess(rexFieldAccess: RexFieldAccess): GeneratedExpression = ??? + override def visitFieldAccess(rexFieldAccess: RexFieldAccess): GeneratedExpression = + throw new CodeGenException("The 'FieldAccess' feature is currently not supported.") --- End diff -- This error message might not be very helpful. It does not tell a user what caused the problem and how it can be fixed. Would `"Nested field access is not support yet"` be better?
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