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https://issues.apache.org/jira/browse/SPARK-16947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan updated SPARK-16947:
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Fix Version/s: 2.1.0
> Support type coercion and foldable expression for inline tables
> ---------------------------------------------------------------
>
> Key: SPARK-16947
> URL: https://issues.apache.org/jira/browse/SPARK-16947
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Herman van Hovell
> Assignee: Peter Lee
> Fix For: 2.1.0
>
>
> Inline tables were added in to Spark SQL in 2.0, e.g.: {{select * from values
> (1, 'A'), (2, 'B') as tbl(a, b)}}
> This is currently implemented using a {{LocalRelation}} and this relation is
> created during parsing. This has several weaknesses: you can only use simple
> expressions in such a plan, and type coercion is based on the first row in
> the relation, and all subsequent values are cast in to this type. The latter
> violates the principle of least surprise.
> I would like to rewrite this into a union of projects; each of these projects
> would contain a single table row. We apply better type coercion rules to a
> union, and we should be able to rewrite this into a local relation during
> optimization.
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