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  1. Core Server
  2. SERVER-10682

Expose $multiply as both an accumulator and an expression

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      This would perform like $sum, but compute the multiplied product instead of an additive sum.

      Just as these operators became available both as accumulators (for grouping) and expressions (for simple transformations like in $project) in 3.2, we should make $multiply work with an array of inputs, and also be available as an accumulator during the $group stage.

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