[jira] [Updated] (IMPALA-6183) Converting Decimal to Double loses precision

["Alex Rodoni (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-6183?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Rodoni updated IMPALA-6183:
--------------------------------
    Docs Text:   (was: Flag this in release notes as an "incompatible change".)

> Converting Decimal to Double loses precision
> --------------------------------------------
>
>                 Key: IMPALA-6183
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6183
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>    Affects Versions: Impala 2.7.0, Impala 2.8.0, Impala 2.9.0, Impala 2.10.0, Impala 2.11.0
>            Reporter: Taras Bobrovytsky
>            Assignee: Taras Bobrovytsky
>            Priority: Major
>             Fix For: Impala 2.11.0
>
>
> The following query returns a correct result:
> {code}
> select cast(1.1112223334445559 as double)
> {code}
> Result:
> {code}
> 1.111222333444556
> {code}
> However, if we first convert the literal to a decimal, we lose precision.
> {code}
> select cast(cast(1.1112223334445559 as decimal(38, 37)) as double)
> {code}
> Result:
> {code}
> 1.111222340799091
> {code}



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