LiteralsSource
Literal documents, the source of com.google.firebase.firestore.PipelineSource.literals: each map is one input document, its values constants or expressions (also nested in maps and lists), converted when the pipeline is executed.
Functions
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A copy of this stage with the option key set to a reference to the field value. The JS SDK cannot send a field reference as an option: on JS and wasmJs, executing the pipeline fails with UnsupportedOperationException.