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Posted to issues@spark.apache.org by "Herman van Hovell (JIRA)" <ji...@apache.org> on 2016/09/21 13:55:20 UTC
[jira] [Resolved] (SPARK-17590) Analyze CTE definitions at once and
allow CTE subquery to define CTE
[ https://issues.apache.org/jira/browse/SPARK-17590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Herman van Hovell resolved SPARK-17590.
---------------------------------------
Resolution: Fixed
Assignee: Liang-Chi Hsieh
Fix Version/s: 2.1.0
> Analyze CTE definitions at once and allow CTE subquery to define CTE
> --------------------------------------------------------------------
>
> Key: SPARK-17590
> URL: https://issues.apache.org/jira/browse/SPARK-17590
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Liang-Chi Hsieh
> Assignee: Liang-Chi Hsieh
> Fix For: 2.1.0
>
>
> We substitute logical plan with CTE definitions in the analyzer rule CTESubstitution. A CTE definition can be used in the logical plan for multiple times, and its analyzed logical plan should be the same. We should not analyze CTE definitions multiple times when they are reused in the query.
> By analyzing CTE definitions before substitution, we can support defining CTE in subquery.
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