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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