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https://issues.apache.org/jira/browse/HIVE-22476?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Slim Bouguerra updated HIVE-22476:
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Attachment: HIVE-22476.9.patch
> Hive datediff function provided inconsistent results when
> hive.fetch.task.conversion is set to none
> ---------------------------------------------------------------------------------------------------
>
> Key: HIVE-22476
> URL: https://issues.apache.org/jira/browse/HIVE-22476
> Project: Hive
> Issue Type: Bug
> Reporter: Slim Bouguerra
> Assignee: Slim Bouguerra
> Priority: Major
> Attachments: HIVE-22476.2.patch, HIVE-22476.3.patch,
> HIVE-22476.5.patch, HIVE-22476.6.patch, HIVE-22476.7.patch,
> HIVE-22476.7.patch, HIVE-22476.8.patch, HIVE-22476.8.patch,
> HIVE-22476.8.patch, HIVE-22476.9.patch
>
>
> The actual issue stems to the different date parser used by various part of
> the engine.
> Fetch task uses udfdatediff via {code}
> org.apache.hadoop.hive.ql.udf.generic.GenericUDFToDate{code} while the
> vectorized llap execution uses {code}VectorUDFDateDiffScalarCol{code}.
> This fix is meant to be not very intrusive and will add more support to the
> GenericUDFToDate by enhancing the parser.
> For the longer term will be better to use one parser for all the operators.
> Thanks [~Rajkumar Singh] for the repro example
> {code}
> create external table testdatediff(datetimecol string) stored as orc;
> insert into testdatediff values ('2019-09-09T10:45:49+02:00'),('2019-07-24');
> select datetimecol from testdatediff where datediff(cast(current_timestamp as
> string), datetimecol)<183;
> set hive.ferch.task.conversion=none;
> select datetimecol from testdatediff where datediff(cast(current_timestamp as
> string), datetimecol)<183;
> {code}
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