One of MongoDBs pipeline operators for aggregation.
Sealed as these are defined in the MongoDB specifications,
and clients should not have custom operators.
This member is added by an implicit conversion from PipelineOperator to
any2stringadd[PipelineOperator] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from PipelineOperator to
StringFormat[PipelineOperator] performed by method StringFormat in scala.Predef.
One of MongoDBs pipeline operators for aggregation. Sealed as these are defined in the MongoDB specifications, and clients should not have custom operators.