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https://issues.apache.org/jira/browse/HIVE-13977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347644#comment-15347644
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balaswamy vaddeman commented on HIVE-13977:
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This issue is same as https://issues.apache.org/jira/browse/HIVE-14027
> nvl funtion not working after left outer join
> ----------------------------------------------
>
> Key: HIVE-13977
> URL: https://issues.apache.org/jira/browse/HIVE-13977
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.1
> Reporter: balaswamy vaddeman
>
> Recreating problem.
> 1).Create table with sample data.
> create table tabletest (n bigint, t string);
> insert into tabletest values (1, 'one');
> insert into tabletest values(2, 'two');
> 2) Run leftouter join query on single table.
> select a.n as leftHandN
> , b.n as rightHandN
> , b.t as rightHandT
> , nvl(b.t,"empty") as rightHandTnvl -- Expected empty --> received empty
> , nvl(b.n,-1) as rightHandNnvl -- Expected -1 --> received 1
> from
> (
> select *
> from tabletest
> where n=1
> ) a
> left outer join
> (
> select *
> from tabletest
> where 1=2
> ) b
> on a.n = b.n;
> nvl(b.n,-1) should return -1 but returns 1.
> I have found b.n always returning a.n value.if a.n is 1 ,b.n is returning 1
> and if it is 2,same 2 will be returned.
> More information:
> length(b.n) ---gives--->1
> cast(b.n as string) --gives--->1
> ascii(b.n) --gives---->49 i.e 1
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