Vectorization: CASE result type casting

create temporary table foo(q548284 int);
insert into foo values(1),(2),(3),(4),(5),(6);
select q548284, CASE WHEN ((q548284 = 1)) THEN (0.2) WHEN ((q548284 = 2)) THEN (0.4) WHEN ((q548284 = 3)) THEN (0.6) WHEN ((q548284 = 4)) THEN (0.8) WHEN ((q548284 = 5)) THEN (1) ELSE (null) END from foo order by q548284 limit 1;

Caused by: java.lang.ClassCastException: org.apache.hadoop.hive.ql.exec.vector.LongColumnVector cannot be cast to org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector
        at org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector.setElement(DecimalColumnVector.java:130)
        at org.apache.hadoop.hive.ql.exec.vector.expressions.IfExprColumnNull.evaluate(IfExprColumnNull.java:101)