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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-21742) Vectorization: CASE result type casting
Date Wed, 22 May 2019 22:49:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-21742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16846272#comment-16846272
] 

Vineet Garg commented on HIVE-21742:
------------------------------------

Another query which runs into same issue:
{code:sql}
select q548284, CASE WHEN  ((q548284 = 4)) THEN (0.8) WHEN ((q548284 = 5)) THEN (1) ELSE (8)
END from foo order by q548284 limit 1;
{code}

In this case {{IfExprLongScalarLongScalar}} expects its output column to be of type Long but
it is decimal. In first case {{IfExprColumnNull}} expects type of its argument and output
type to be same but it is LONG and DECIMAL respectively.

> 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
>            Priority: Major
>
> {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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