[jira] [Assigned] (SPARK-10868) monotonicallyIncreasingId() supports offset for indexing

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-10868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-10868:
------------------------------------

    Assignee: Apache Spark

> monotonicallyIncreasingId() supports offset for indexing
> --------------------------------------------------------
>
>                 Key: SPARK-10868
>                 URL: https://issues.apache.org/jira/browse/SPARK-10868
>             Project: Spark
>          Issue Type: New Feature
>          Components: SQL
>    Affects Versions: 1.5.0
>            Reporter: Martin Senne
>            Assignee: Apache Spark
>
> With SPARK-7135 and https://github.com/apache/spark/pull/5709 `monotonicallyIncreasingID()` allows to create an index column with unique ids. The indexing always starts at 0 (no offset).
> *Feature wish*
> Having a parameter `offset`, such that the function can be used as
>     {{monotonicallyIncreasingID( offset )}}
> and indexing _starts at *offset* instead of 0_.
> *Use-case* 
> Add rows to a DataFrame that is already written to a DB (via _.write.jdbc(...)_).
> In detail:
> - A DataFrame *A* (containing an ID column) and having indices from 0 to 199 in that column is existent in DB.
> - New rows need to be added to *A*. This included
> -- Creating a DataFrame *A'* with new rows, but without id column
> -- Add the index column to *A'* - this time starting at *200*, as there are already entries with id's from 0 to 199 (*here, monotonicallyInreasingID( 200 ) is required.*)
> -- union *A* and *A'*
> -- store into DB



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