Confused about $facet documentation and what is allowed

MongoDB University M121: The MongoDB Aggregation Framework
#1

I am confused by the documentation on $facet.

Specifically, in the Behavior section, it isn’t clear to me if the prohibited aggregation stages are not allowed inside a $facet stage or in conjunction with the $facet stage? Or, both within the $facet stage and as a separate stage either before or after the $facet?

Can someone clear that up for me, please?

#2

I think

All except the $out , $merge , and $geoNear stages can appear multiple times in a pipeline.

from the Aggregation Pipeline documentation page, combined with the $facet documentation, answers my question.

That answer being that the prohibition is for within the $facet stage.

#3

@Tim_Rohrer , You are right!!

#4

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