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

["Patrick Morton (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-5872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14076131#comment-14076131 ] 

Patrick Morton commented on HIVE-5872:
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> 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
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5872.1.patch, HIVE-5872.2.patch, HIVE-5872.3.patch, HIVE-5872.4.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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