Gopal V created HIVE-21742:
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Summary: Vectorization: CASE result type casting
Key: HIVE-21742
URL: https://issues.apache.org/jira/browse/HIVE-21742
Project: Hive
Issue Type: Bug
Components: Logical Optimizer, Vectorization
Affects Versions: 3.1.1
Reporter: Gopal V
{code}
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;
{code}
Fails with
{code}
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)
{code}
This gets fixed if the case return of (1) is turned into a (1.0).
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