GitHub user viirya opened a pull request:

    https://github.com/apache/spark/pull/15146

    [SPARK-17590][SQL] Analyze CTE definitions at once

    ## What changes were proposed in this pull request?
    
    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.
    
    ## How was this patch tested?
    
    Jenkins tests.
    
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/viirya/spark-1 cte-analysis-once

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/15146.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #15146
    
----
commit 394495d0effc0c217ff6bb0df92e664636e0dfa0
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date:   2016-09-19T02:13:19Z

    Analyze CTE definition at once.

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