GitHub user liufengdb opened a pull request:

    https://github.com/apache/spark/pull/20565

    SPAR[SPARK-23379][SQL] remove redundant metastore access

    ## What changes were proposed in this pull request?
    
    If the target database name is as same as the current database, we should 
be able to skip one metastore access. 
    
    ## How was this patch tested?
    
    (Please explain how this patch was tested. E.g. unit tests, integration 
tests, manual tests)
    (If this patch involves UI changes, please attach a screenshot; otherwise, 
remove this)
    
    Please review http://spark.apache.org/contributing.html before opening a 
pull request.


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

    $ git pull https://github.com/liufengdb/spark remove-redundant

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

    https://github.com/apache/spark/pull/20565.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 #20565
    
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commit f1acb5ad9a12df11faf082144c676082df647ff9
Author: Feng Liu <fengliu@...>
Date:   2018-02-10T00:18:44Z

    some

commit c29aa3ecb78dc345bb2ad1e5cbaf29d3fdb3a803
Author: Feng Liu <fengliu@...>
Date:   2018-02-10T01:10:53Z

    init

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