[jira] [Commented] (IMPALA-7243) width_bucket() returns an incorrect result

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMPALA-7243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16570986#comment-16570986 ] 

ASF subversion and git services commented on IMPALA-7243:
---------------------------------------------------------

Commit df3f1658461553a174dd27fce2edce8594aefd16 in impala's branch refs/heads/master from aphadke
[ https://git-wip-us.apache.org/repos/asf?p=impala.git;h=df3f165 ]

IMPALA-7242/IMPALA-7243: check for overflow when converting IntVal to DecimalValue

This change adds a check for an overflow which can happen during
converting num_buckets from IntVal to a DecimalValue during width_bucket
evaluation. An overflow can result in hitting a DCHECK if it needs int256
for intermediate evaluations or returns a wrong result otherwise.

Change-Id: Ie5808802096bb0e6cfd4ab6464538474e42cab60
Reviewed-on: http://gerrit.cloudera.org:8080/11020
Reviewed-by: Tim Armstrong <ta...@cloudera.com>
Tested-by: Impala Public Jenkins <im...@cloudera.com>


> width_bucket() returns an incorrect result
> ------------------------------------------
>
>                 Key: IMPALA-7243
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7243
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 3.1.0
>            Reporter: Taras Bobrovytsky
>            Assignee: Anuj Phadke
>            Priority: Critical
>
> The following query returns an incorrect result:
> {code:java}
> select width_bucket(cast(9 as decimal(10,7)), cast(-60000 as decimal(11,6)), cast(10 as decimal(7,5)), 249895273);{code}
> Result:
> {code:java}
> 1{code}
> Since 9 is slightly less than the upper bound, which is 10, the result should be the number of buckets.



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