Analyzes two sets of keys coming from two input data flows and calculates occurences of several relation types. The types of relations are:

• 1:1 - keys unique in both inputs
• 1:M - keys unique in left input
• N:1 - keys unique in right input
• N:M - keys not unique
• 1:0 - keys unique in left but not present in right
• N:0 - keys not present in right
• 0:1 - keys unique in right but not present in left
• 0:M - keys not present in left
• null - null keys in left or right

One record for each of these relations is send to the out endpoint. The record contains the number of corresponding distinct keys and number of corresponding records in the left and right.

Optionally, the output records sent to out_left/out_right can store appropriate counts of records with the same key in the left and/or right data flow.