Github user zsxwing commented on the pull request:

    https://github.com/apache/spark/pull/3660#issuecomment-66954374
  
    > I guess what you mentioned is the plan to support multiple data sources 
via the newly introduced external data source API?
    
    Yes.
    
    > In that commit I just want to ensure the SQLContext we used in 
InMemoryColumnarTableScan is the same one used by its child .
    
    In which case, it won't be `protected[spark] val sqlContext = 
SparkPlan.currentContext.get()`?


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