[jira] [Assigned] (SPARK-11329) Expand Star when creating a struct

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

     [ https://issues.apache.org/jira/browse/SPARK-11329?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-11329:
------------------------------------

    Assignee:     (was: Apache Spark)

> Expand Star when creating a struct
> ----------------------------------
>
>                 Key: SPARK-11329
>                 URL: https://issues.apache.org/jira/browse/SPARK-11329
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Yin Huai
>
> It is pretty common for customers to do regular extractions of update data from an external datasource (e.g. mysql or postgres). While this is possible today, the syntax is a little onerous. With some small improvements to the analyzer I think we could make this much easier.
> Goal: Allow users to execute the following two queries as well as their dataframe equivalents
> to find the most recent record for each key
> {{SELECT max(struct(timestamp, *)) as mostRecentRecord GROUP BY key}}
> to unnest the struct from above.
> {{SELECT mostRecentRecord.* FROM data}}



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