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________ returns a set with elements that appear in any of the input sets.

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________ returns a set with elements that appear in any of the input sets.

(a) $setIntersection

(b) $setDifference

(c) $setEquals

(d) $setUnion

The question was posed to me at a job interview.

The question is from Pipeline Optimization in division Aggregation Concepts and Aggregation Mechanics of MongoDB

1 Answer

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Best answer
Right answer is (d) $setUnion

The best I can explain: $setUnion performs set operation on arrays, treating arrays as sets.

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