ql/src/test/queries/clientpositive/udf_case_column_pruning.q

--! qt:dataset:src
set hive.mapred.mode=nonstrict;
EXPLAIN
SELECT CASE a.key
        WHEN '1' THEN 2
        WHEN '3' THEN 4
        ELSE 5
       END as key
FROM src a JOIN src b
ON a.key = b.key
ORDER BY key LIMIT 10;

SELECT CASE a.key
        WHEN '1' THEN 2
        WHEN '3' THEN 4
        ELSE 5
       END as key
FROM src a JOIN src b
ON a.key = b.key
ORDER BY key LIMIT 10;