[
https://issues.apache.org/jira/browse/SPARK-16721?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Josh Rosen updated SPARK-16721:
-------------------------------
Labels: correctness (was: )
> Lead/lag needs to respect nulls
> --------------------------------
>
> Key: SPARK-16721
> URL: https://issues.apache.org/jira/browse/SPARK-16721
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Yin Huai
> Assignee: Yin Huai
> Labels: correctness
> Fix For: 2.0.1, 2.1.0
>
>
> Seems 2.0.0 changes the behavior of lead and lag to ignore nulls. This PR is
> changing the behavior back to 1.6's behavior, which is respecting nulls.
> For example
> {code}
> SELECT
> b,
> lag(a, 1, 321) OVER (ORDER BY b) as lag,
> lead(a, 1, 321) OVER (ORDER BY b) as lead
> FROM (SELECT cast(null as int) as a, 1 as b
> UNION ALL
> select cast(null as int) as id, 2 as b) tmp
> {code}
> This query should return
> {code}
> +---+----+----+
> | b| lag|lead|
> +---+----+----+
> | 1| 321|null|
> | 2|null| 321|
> +---+----+----+
> {code}
> instead of
> {code}
> +---+---+----+
> | b|lag|lead|
> +---+---+----+
> | 1|321| 321|
> | 2|321| 321|
> +---+---+----+
> {code}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
