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https://issues.apache.org/jira/browse/HIVE-13557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15578800#comment-15578800
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Zoltan Haindrich commented on HIVE-13557:
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i've posted the first version.
instead of trying to force the existing interval evaluation logic to do these
too...i've added an interval evalution logic inside an udf; i think it would be
good to use the same thing to evaluate the old {{intervalLiteral}}'s outputs -
however that would need intervalLiteral to be removed from the 'constant'
group...I think the only feature which would be missing after that: is the
ability to specify skewed columns by intervalLiterals...
using an udf enables that the interval argument can be possibly a column
reference also - if I interpretted the sql2011 correctly: that's desired by the
standard.
note: currently the parentheses are mandatory..but in case we merge
{{intervalExpression}} with {{intervalLiteral}}...it wont be needed anymore - I
haven't found any references about these parentheses to be mandatory - its a
large document...I lose my mind every time I open it ;)
> Make interval keyword optional while specifying DAY in interval arithmetic
> --------------------------------------------------------------------------
>
> Key: HIVE-13557
> URL: https://issues.apache.org/jira/browse/HIVE-13557
> Project: Hive
> Issue Type: Sub-task
> Components: Types
> Reporter: Ashutosh Chauhan
> Assignee: Zoltan Haindrich
> Attachments: HIVE-13557.1.patch
>
>
> Currently we support expressions like: {code}
> WHERE SOLD_DATE BETWEEN ((DATE('2000-01-31')) - INTERVAL '30' DAY) AND
> DATE('2000-01-31')
> {code}
> We should support:
> {code}
> WHERE SOLD_DATE BETWEEN ((DATE('2000-01-31')) + (-30) DAY) AND
> DATE('2000-01-31')
> {code}
>
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