Scala implicit ordering fun -- have 2 forms of sketch, defaulting to …

[ianoc]

…the existing

@johnynek as we were discussing for the sketch method. More of a consideration than hard PR

[johnynek]

looks good to me modulo the naming (I would use names for classes more specific to SketchJoin)

[johnynek]

:+1: I like this. You can use the OrderedSerialization macros, not have an implicit conversion in scope and do a more efficient join at the same time. Seems like a win.

[johnynek]

what do you think of this @rubanm @isnotinvain ? I like not having to set up an implicit conversion and the ability to use compiler generated serializers.

[rubanm]

@johnynek @ianoc Sorry late to this. Just one unit test comment. LGTM!

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