Table of Contents

Enum MapReduceOutputMode

Namespace
MongoDB.Driver.Core.Operations
Assembly
MongoDB.Driver.Core.dll

Represents the map-reduce output mode.

[Obsolete("Use Aggregation pipeline instead.")]
public enum MapReduceOutputMode

Fields

Replace = 0

The output of the map-reduce operation replaces the output collection.

Merge = 1

The output of the map-reduce operation is merged with the output collection. If an existing document has the same key as the new result, overwrite the existing document.

Reduce = 2

The output of the map-reduce operation is merged with the output collection. If an existing document has the same key as the new result, apply the reduce function to both the new and the existing documents and overwrite the existing document with the result.