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https://issues.apache.org/jira/browse/HIVE-24865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Krisztian Kasa reassigned HIVE-24865:
-------------------------------------
> Implement Respect/Ignore Nulls in first/last_value
> --------------------------------------------------
>
> Key: HIVE-24865
> URL: https://issues.apache.org/jira/browse/HIVE-24865
> Project: Hive
> Issue Type: New Feature
> Components: Parser, UDF
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Minor
>
> {code:java}
> <null treatment> ::=
> RESPECT NULLS | IGNORE NULLS
> <first or last value function> ::=
> <first or last value> <left paren> <value expression> <right paren> [ <null
> treatment>
> ]
> <first or last value> ::=
> FIRST_VALUE | LAST_VALUE
> {code}
> Example:
> {code:java}
> select last_value(b) ignore nulls over(partition by a order by b) from t1;
> {code}
> Existing non-standard implementation:
> {code:java}
> select last_value(b, true) over(partition by a order by b) from t1;
> {code}
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