How to create a custom udaf in mongo db?

Working with Data
#1

HI,

i want to create create a custom user defined aggregation function in mongo db how to do it??

#2

Hi @anubhav_tarar,

Welcome to MongoDB community.

I think you are looking for $function or $accumulator:

https://docs.mongodb.com/manual/reference/operator/aggregation/function/

https://docs.mongodb.com/manual/reference/operator/aggregation/accumulator/

Those are available from 4.4 .

Otherwise there is a mapReduce command
https://docs.mongodb.com/manual/reference/command/mapReduce/index.html

Thanks
Pavel

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#3

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