JoinControl has to be used in HashJoin runtime operator, basically it is to allow the operator to skip some operations when it is index join(so we are expecting INTERSECT and nothing else). I don't have the original code at hand, but I think it should be in the first MapR 6.0 release. Since this part is only about performance and correctness won't be impacted, if it was lost during some merge process people might not notice it.
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