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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15338) Wrong result from vectorized DATEDIFF with scalar parameter of type DATE
Date Fri, 02 Dec 2016 03:01:07 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15713852#comment-15713852
] 

Matt McCline commented on HIVE-15338:
-------------------------------------

[~jdere] [~sershe] I'm see a difference in the vectorized vs non-vectorized Q file output
for the updated vectorized_date_funcs.q in the patch.

In the VectorUDFDateDiffScalarCol class, when the scalar parameter is a TIMESTAMP we call:

{code}
        date.setTime(timestampValue.getTime());
        baseDate = DateWritable.dateToDays(date);
{code}

but GenericUDFDateDiff executes apparently different logic (it uses a TimestampConverter object).
 I'll have to dig in a figure out what is happening...

> Wrong result from vectorized DATEDIFF with scalar parameter of type DATE
> ------------------------------------------------------------------------
>
>                 Key: HIVE-15338
>                 URL: https://issues.apache.org/jira/browse/HIVE-15338
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>            Priority: Critical
>         Attachments: HIVE-15338.01.patch
>
>
> Vectorization in vectorized DATEDIFF when parameter is (date '12-01-16', column). Jason
noted that ('12-01-16', column) treats the first parameter as a string and is a different
case.
> Current Q file test vectorized_date_funcs.q DOES NOT test the date scalar type case.



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