Aggregation Expression - $max

Function Build

Build $max with the Max function from the aggregation package.

// bson.D{bson.E{Key:"maxScore", Value:bson.D{bson.E{Key:"$max", Value:"$score"}}}}
result := aggregation.Max("maxScore", "$score")

Method Build (Builder)

Build $max with the Max method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"maxScore", Value:bson.D{bson.E{Key:"$max", Value:"$score"}}}}
result := aggregation.NewBuilder().
    Max("maxScore", "$score").
    Build()

Build Without Key

When an expression needs to be passed as an argument to another expression, use a WithoutKey variant to build an expression fragment without an output field name.

MaxWithoutKey

Function build:

// bson.D{bson.E{Key:"$max", Value:"$score"}}
expr := aggregation.MaxWithoutKey("$score")

Method build (Builder):

// bson.D{bson.E{Key:"$max", Value:"$score"}}
expr := aggregation.NewBuilder().
    MaxWithoutKey("$score").
    Build()