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https://issues.apache.org/jira/browse/SPARK-11329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14979476#comment-14979476
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Apache Spark commented on SPARK-11329:
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User 'nongli' has created a pull request for this issue:
https://github.com/apache/spark/pull/9343
> 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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