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https://issues.apache.org/jira/browse/SPARK-11329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14975351#comment-14975351
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Yin Huai commented on SPARK-11329:
----------------------------------
We can try {{sqlContext.sql("select max(struct(1, *)) from (select 1 as a, 2 as
b) tmp group by a").queryExecution.analyzed}} and plan looks like
{code}
res11: org.apache.spark.sql.catalyst.plans.logical.LogicalPlan =
'Aggregate ['a], [unresolvedalias('max('struct(1,*)))]
Subquery tmp
Project [1 AS a#27,2 AS b#28]
OneRowRelation$
{code}
Looks like [this analysis rule |
https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala#L320-L326]
did not work as expected?
> 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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