$addFields cost in aggregation framework

[Fernando Aspiazu]

Good morning all!

I would ask, what is the impact on performances when using $addFields operator in aggregation framework? What's the cost? Specially if I have million of documents?

Thanks in advance.

[Asya Kamsky]

Of course it may depend on how much work you're doing in the expressions of $addFields and how many fields you're adding, but it should be pretty negligible normally as the documents are "streaming" through the pipeline and this stage just adds a field or several fields to each document in streaming fashion.

Do you have a specific concern or example?   I imagine it depends on the overall pipeline, whether it would be completely negligible/unmeasurable or noticeable difference.

Asya

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Asya Kamsky
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