When a Kudu table is created outside Impala with non-lower-case column names, an Impala query using that column name in 'order by' will fail.
Create a Kudu table in the python client:
Then in Impala:
results in the failure: Unable to deserialize scan token: Invalid argument: Duplicate column name: VAL
While Impala cannot support different cased column names that conflict (e.g. "VAL" and "val" should not be supported, see
IMPALA-5283), this query could be supported.