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https://issues.apache.org/jira/browse/SPARK-17590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Liang-Chi Hsieh updated SPARK-17590:
Description:
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.
was: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.
> 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
>
> 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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