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Posted to issues@spark.apache.org by "jiaan.geng (Jira)" <ji...@apache.org> on 2021/10/21 10:16:00 UTC
[jira] [Issue Comment Deleted] (SPARK-30789) Support (IGNORE |
RESPECT) NULLS for LEAD/LAG/NTH_VALUE/FIRST_VALUE/LAST_VALUE
[ https://issues.apache.org/jira/browse/SPARK-30789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
jiaan.geng updated SPARK-30789:
-------------------------------
Comment: was deleted
(was: I will working on.)
> Support (IGNORE | RESPECT) NULLS for LEAD/LAG/NTH_VALUE/FIRST_VALUE/LAST_VALUE
> ------------------------------------------------------------------------------
>
> Key: SPARK-30789
> URL: https://issues.apache.org/jira/browse/SPARK-30789
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: jiaan.geng
> Assignee: Apache Spark
> Priority: Major
> Fix For: 3.2.0
>
>
> All of LEAD/LAG/NTH_VALUE/FIRST_VALUE/LAST_VALUE should support IGNORE NULLS | RESPECT NULLS. For example:
> {code:java}
> LEAD (value_expr [, offset ])
> [ IGNORE NULLS | RESPECT NULLS ]
> OVER ( [ PARTITION BY window_partition ] ORDER BY window_ordering ){code}
>
> {code:java}
> LAG (value_expr [, offset ])
> [ IGNORE NULLS | RESPECT NULLS ]
> OVER ( [ PARTITION BY window_partition ] ORDER BY window_ordering ){code}
>
> {code:java}
> NTH_VALUE (expr, offset)
> [ IGNORE NULLS | RESPECT NULLS ]
> OVER
> ( [ PARTITION BY window_partition ]
> [ ORDER BY window_ordering
> frame_clause ] ){code}
>
> *Oracle:*
> [https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/NTH_VALUE.html#GUID-F8A0E88C-67E5-4AA6-9515-95D03A7F9EA0]
> *Redshift*
> [https://docs.aws.amazon.com/redshift/latest/dg/r_WF_NTH.html]
> *Presto*
> [https://prestodb.io/docs/current/functions/window.html]
> *DB2*
> [https://www.ibm.com/support/knowledgecenter/SSGU8G_14.1.0/com.ibm.sqls.doc/ids_sqs_1513.htm]
> *Teradata*
> [https://docs.teradata.com/r/756LNiPSFdY~4JcCCcR5Cw/GjCT6l7trjkIEjt~7Dhx4w]
> *Snowflake*
> [https://docs.snowflake.com/en/sql-reference/functions/lead.html]
> [https://docs.snowflake.com/en/sql-reference/functions/lag.html]
>
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