eaton created SPARK-26312:
-----------------------------

             Summary: Converting converters in RDDConversions into arrays to 
improve their access performance
                 Key: SPARK-26312
                 URL: https://issues.apache.org/jira/browse/SPARK-26312
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: eaton


`RDDConversions` would get disproportionately slower as the number of columns 
in the query increased.
This PR converts the `converters` in `RDDConversions` into arrays to improve 
their access performance, the type of `converters` before is 
`scala.collection.immutable.::` which is a subtype of list.



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