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https://issues.apache.org/jira/browse/HIVE-13663?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nuthan Reddy Gantla updated HIVE-13663:
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Labels: features newbie (was: newbie)
> Create UDFs using existing functions in Hive instead from JAR files
> -------------------------------------------------------------------
>
> Key: HIVE-13663
> URL: https://issues.apache.org/jira/browse/HIVE-13663
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Nuthan Reddy Gantla
> Assignee: Jason Dere
> Priority: Minor
> Labels: features, newbie
>
> Recently i came across
> FIRST_DAY_OF_YEAR UDF in SQL which returns Jan 1st of that year.
> This could be made simply using existing functions in Hive as
> suppose our input date is '2016-03-04'
> concat(Year('2016-03-04'),'-01-01')
> instead of loading a JAR file. And moreover i guess using JAR has less
> performance when compared to the above implementation.
> We can also use UDFs for hiding complex functions from our query which makes
> it more readable.
> Kindly let me know if i'm wrong about performance.
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