GitHub user gatorsmile opened a pull request:

    https://github.com/apache/spark/pull/18864

    [SPARK-21648] [SQL] Fix confusing assert failure in JDBC source when 
parallel fetching parameters are not properly provided.

    ### What changes were proposed in this pull request?
    ```SQL
    CREATE TABLE mytesttable1 
    USING org.apache.spark.sql.jdbc 
      OPTIONS ( 
      url 
'jdbc:mysql://${jdbcHostname}:${jdbcPort}/${jdbcDatabase}?user=${jdbcUsername}&password=${jdbcPassword}',
 
      dbtable 'mytesttable1', 
      paritionColumn 'state_id', 
      lowerBound '0', 
      upperBound '52', 
      numPartitions '53', 
      fetchSize '10000' 
    )
    ```
    
    The above option name `paritionColumn` is wrong. That mean, users did not 
provide the value for `partitionColumn`. In such case, users hit a confusing 
error.
    
    ```
    AssertionError: assertion failed
    java.lang.AssertionError: assertion failed
        at scala.Predef$.assert(Predef.scala:156)
        at 
org.apache.spark.sql.execution.datasources.jdbc.JdbcRelationProvider.createRelation(JdbcRelationProvider.scala:39)
        at 
org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:312)
    ```
    
    
    ### How was this patch tested?
    Added a test case

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

    $ git pull https://github.com/gatorsmile/spark jdbcPartCol

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

    https://github.com/apache/spark/pull/18864.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 #18864
    
----
commit e4aac502d58972063a1ab25f17a1c217abe97b97
Author: gatorsmile <gatorsm...@gmail.com>
Date:   2017-08-05T05:38:15Z

    improve message.

----


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