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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/04/26 21:29:38 UTC

[jira] [Updated] (SPARK-7135) Expression for monotonically increasing IDs

     [ https://issues.apache.org/jira/browse/SPARK-7135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Reynold Xin updated SPARK-7135:
-------------------------------
    Summary: Expression for monotonically increasing IDs  (was: Add a Column expression that can generates unique IDs for each row)

> Expression for monotonically increasing IDs
> -------------------------------------------
>
>                 Key: SPARK-7135
>                 URL: https://issues.apache.org/jira/browse/SPARK-7135
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>
> Seems like a common use case that users might want a unique ID for each row. It is more expensive to have consecutive IDs, since that'd require two pass over the data. However, many use cases can be satisfied by just having unique ids.



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