Package dev.morphia.aggregation.stages

@NonNullApi package dev.morphia.aggregation.stages

Defines the aggregation stages. Access to these types is provided by Aggregation.

See Also:

• Aggregation

Related Packages

Package	Description
dev.morphia.aggregation	Defines the Morphia support for the aggregation framework.
dev.morphia.aggregation.expressions	Defines factory classes for accessing the various expressions in the aggregation framework.

Class	Description
AddFields	Adds new fields to documents.
AutoBucket	Categorizes incoming documents into a specific number of groups, called buckets, based on a specified expression.
Bucket	Categorizes incoming documents into groups, called buckets, based on a specified expression and bucket boundaries.
ChangeStream	Returns a Change Stream cursor on a collection, a database, or an entire cluster.
CollectionStats	Returns statistics regarding a collection or view.
Count	Passes a document to the next stage that contains a count of the number of documents input to the stage.
CurrentOp	Returns a stream of documents containing information on active and/or dormant operations as well as inactive sessions that are holding locks as part of a transaction.
Densify	Creates new documents in a sequence of documents where certain values in a field are missing.
Densify.Range	Defines a range.
Documents	Returns literal documents from input values.
Facet	Processes multiple aggregation pipelines within a single stage on the same set of input documents.
Fill	Populates null and missing field values within documents.
Fill.Method	Possible methods for defining fill strategies.
GeoNear	Outputs documents in order of nearest to farthest from a specified point.
GraphLookup	Performs a recursive search on a collection, with options for restricting the search by recursion depth and query filter.
Group	Groups input documents by the specified _id expression and for each distinct grouping, outputs a document.
Group.GroupId	Defines a group ID
IndexStats	Returns statistics regarding the use of each index for the collection.
Limit	Limits the number of documents passed to the next stage in the pipeline.
Lookup	Performs a left outer join to an unsharded collection in the same database to filter in documents from the “joined” collection for processing.
Match	Limits the number of documents passed to the next stage in the pipeline.
Merge<M>	Writes the results of the aggregation pipeline to a specified collection.
Out<O>	Takes the documents returned by the aggregation pipeline and writes them to a specified collection.
PlanCacheStats	Returns plan cache information for a collection.
Projection	Passes along the documents with the requested fields to the next stage in the pipeline.
Redact	Restricts the contents of the documents based on information stored in the documents themselves.
ReplaceRoot	Replaces the input document with the specified document.
ReplaceWith	Replaces the input document with the specified document.
Sample	Randomly selects the specified number of documents from its input.
Set	Adds new fields to documents.
SetWindowFields	Performs operations on a specified span of documents in a collection, known as a window, and returns the results based on the chosen window operator.
SetWindowFields.Output	Specifies the field(s) to append to the documents in the output returned by the $setWindowFields stage.
SetWindowFields.Window	Specifies the window boundaries and parameters.
Skip	Randomly selects the specified number of documents from its input.
Sort	Sorts all input documents and returns them to the pipeline in sorted order.
Sort.Direction	The sort types
SortByCount	Groups incoming documents based on the value of a specified expression, then computes the count of documents in each distinct group.
Stage	Base type for stages.
UnionWith	Performs a union of two collections; i.e.
Unset	Removes/excludes fields from documents.
Unwind	Deconstructs an array field from the input documents to output a document for each element.