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https://issues.apache.org/jira/browse/IMPALA-6518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Taras Bobrovytsky resolved IMPALA-6518.
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Resolution: Fixed
Fix Version/s: Impala 3.0
> Fix the output type of a decimal union for decimal_v2
> -----------------------------------------------------
>
> Key: IMPALA-6518
> URL: https://issues.apache.org/jira/browse/IMPALA-6518
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 3.0
> Reporter: Taras Bobrovytsky
> Assignee: Taras Bobrovytsky
> Priority: Major
> Fix For: Impala 3.0
>
>
> In the following query, the type of c1 is decimal(38, 38) for both decimal v1
> and v2.
> {code:java}
> select c1 from (
> select cast(1 as decimal(38, 0)) as c1
> union all
> select cast(0.1 as decimal(38, 38)) as c1) t{code}
> This means that we are truncating from the front. It would make more sense to
> truncate from the back and round when decimal v2 is enabled. The output type
> should be (38, 6). This is what we do for other mathematical operations, such
> as addition.
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