Merge

Finds all items in A for which the second column matches an object from B. Usually used to merge back objects which have previously been split.

• A [OBJ,OBJ]: a list of pairs to be searched
• B [OBJ]: a list of objects to be found in A

• A1 [OBJ]: from the first column of A only those items of which the second column matched with B
• A1A2 [OBJ,OBJ]: tuples of A where the second column matched with B
• A1B1 [OBJ,OBJ]: tuples (A1,B) where A2 matched with B

Output scores can be aggregated and/or normalized.