GitHub user cloud-fan opened a pull request:

    https://github.com/apache/spark/pull/15465

    [SPARK-17909][SQL] we should create table before writing out the data in 
CTAS

    ## What changes were proposed in this pull request?
    
    In `CreateDataSourceTableAsSelectCommand`, we write out the data to the 
table location before create table, because we assume the data schema may 
change after it has been written out. However, we may only change the schema's 
nullability. We can still create table first, with regarding all columns are 
nullable.
    
    ## How was this patch tested?
    
    existing tests.
    


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

    $ git pull https://github.com/cloud-fan/spark nullable

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

    https://github.com/apache/spark/pull/15465.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 #15465
    
----
commit 543f0143e65b561eb79f7c4f8783fa85d28fe2a1
Author: Wenchen Fan <wenc...@databricks.com>
Date:   2016-10-13T14:57:26Z

    we should create table before writing out the data in CTAS

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