GitHub user gatorsmile opened a pull request:

    [SPARK-17947] [SQL] Add Doc and Comment about spark.sql.debug

    ### What changes were proposed in this pull request?
    Just document the impact of `spark.sql.debug`:
    When enabling the debug, Spark SQL internal table properties are not 
filtered out; however, some related DDL commands (e.g., Analyze Table and 
CREATE TABLE LIKE) might not work properly.
    ### How was this patch tested?

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

    $ git pull addDocForSQLDebug

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

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

    This closes #15494
commit ce036ae54b9ee8cd779929092499a3ece3722947
Author: gatorsmile <>
Date:   2016-10-14T21:18:59Z

    doc change.

commit 3334f12cd4f177006eec5933b445fe9fbd804f60
Author: gatorsmile <>
Date:   2016-10-14T21:40:53Z


commit a020f66e8251206d37c9b4fd0f55931f1123529b
Author: gatorsmile <>
Date:   2016-10-14T21:41:27Z



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