GitHub user cloud-fan opened a pull request:

    [SPARK-17899][SQL] add a debug mode to keep raw table properties in 

    ## What changes were proposed in this pull request?
    Currently `HiveExternalCatalog` will filter out the Spark SQL internal 
table properties, e.g. `spark.sql.sources.provider`, 
`spark.sql.sources.schema`, etc. This is reasonable for external users as they 
don't want to see these internal properties in `DESC TABLE`.
    However, as a Spark developer, sometimes we do wanna see the raw table 
properties. This PR adds a new internal SQL conf, `spark.sql.debug`, to enable 
debug mode and keep these raw table properties.
    This config can also be used in similar places where we wanna retain debug 
information in the future.
    ## How was this patch tested?
    new test in MetastoreDataSourcesSuite

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

    $ git pull debug

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 #15458
commit e821f1a9d19215fe180ffcbd8183aabd1185a316
Author: Wenchen Fan <>
Date:   2016-10-13T04:21:01Z

    add a debug mode to keep raw table properties in HiveExternalCatalog


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