[jira] [Updated] (HIVE-5872) Make UDAFs such as GenericUDAFSum report accurate precision/scale for decimal types

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-5872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xuefu Zhang updated HIVE-5872:
------------------------------

    Attachment: HIVE-5872.2.patch

Patch #2 is updated, which also includes patch for HIVE-5866.

> Make UDAFs such as GenericUDAFSum report accurate precision/scale for decimal types
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-5872
>                 URL: https://issues.apache.org/jira/browse/HIVE-5872
>             Project: Hive
>          Issue Type: Improvement
>          Components: Types, UDF
>    Affects Versions: 0.12.0
>            Reporter: Xuefu Zhang
>            Assignee: Xuefu Zhang
>         Attachments: HIVE-5872.1.patch, HIVE-5872.2.patch, HIVE-5872.patch
>
>
> Currently UDAFs are still reporting system default precision/scale (38, 18) for decimal results. Not only this is coarse, but also this can cause problems in subsequent operators such as division, where the result is dependent on the precision/scale of the input, which can go out of bound (38,38). Thus, these UDAFs should correctly report the precision/scale of the result.



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