PipelineSource
PipelineSource
Provides the entry point for defining the data source of a Firestore Pipeline.
Use the methods of this class (e.g., PipelineSource#collection, PipelineSource#collectionGroup, PipelineSource#database, PipelineSource#documents, or PipelineSource#literals) to specify the initial data for your pipeline, such as a collection, a collection group, the entire database, a set of specific documents, or in-memory documents.