QueryRowSourceDocumentId Property

Gets the Id of the Document that caused the QueryRow to be emitted into the View. This will be the same as the documentId property, unless the map function caused a related Document to be linked by adding an '_id' key to the emmitted value. In this case, documentId will refer to the linked Document, while sourceDocumentId always refers to the original Document. In a reduced or grouped Query, sourceDocumentId will be null because the rows don't correspond to individual Document.

public string SourceDocumentId { get; }