Return results of compareAppleTables in a wrapper class

[aosama]

have the compareAppleTable method return the results in a wrapper class that will further provide more APIs.

So the code should look something like this

result = compareAppleTables(x,y).getLeft().sortByCols(“a”,“b”)
OR
result = compareAppleTables(x,y).getJoinedByCols(“a”,“b”).sortBy(“a”,“b”)

[mmlinford]

@aosama I thought about this a little after we met today. Apparently Pair is just an abstract class. So if we made the new wrapper class a decorator for Pair<DataFrame, DataFrame> I believe it would be a non-breaking change, unless Scala has quirks about covariant return types that I don't know about.

[mmlinford]

Since we've apparently decided to do breaking changes anyways, it might not be worth it to go with the suggestion I made (extending Pair is a little weird).

[aosama]

was thinking of a custom result class like so

class ComparisonResults
{
inLeftNotInRight :DataFrame
inRightNotInLeft: DataFrame
def joinedResults(keys :Seq[String]) // this will return a full outer join between the differences
}
@mmlinford what do you think?