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https://issues.apache.org/jira/browse/HIVE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294315#comment-14294315
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Xiaobing Zhou commented on HIVE-9480:
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Since most of logic for FIRST_DAY and LAST_DAY are common. It'd be better to
reuse LAST_DAY impl and make some abstractions to simplify FIRST_DAY impl.
> Implement FIRST_DAY as compared with LAST_DAY already supported in HIVE
> -----------------------------------------------------------------------
>
> Key: HIVE-9480
> URL: https://issues.apache.org/jira/browse/HIVE-9480
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.14.0
> Reporter: Xiaobing Zhou
> Assignee: Xiaobing Zhou
>
> Hive already supports LAST_DAY UDF, in some cases, FIRST_DAY is necessary to
> do date/timestamp related computation. This JIRA is to track such an
> implementation.
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