GitHub user dongjoon-hyun reopened a pull request:

    [SPARK-18419][SQL] Fix `JDBCOptions.asConnectionProperties` to be 

    ## What changes were proposed in this pull request?
    `JDBCOptions.asConnectionProperties` is designed to filter JDBC options 
out, but it fails to handle `CaseInsensitiveMap`. For the following example, it 
returns `Map('numpartitions' -> "10")` as a wrong result and the assertion 
fails. This PR aims to fix `JDBCOptions.asConnectionProperties` to be 
    val options = new JDBCOptions(new CaseInsensitiveMap(Map(
        "url" -> "jdbc:mysql://localhost:3306/temp",
        "dbtable" -> "t1",
        "numPartitions" -> "10")))
    ## How was this patch tested?
    Pass the Jenkins with a new testcase.

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

    $ git pull SPARK-18419

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 #15863


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