RDF.Graph.query_stream

You're seeing just the function query_stream, go back to RDF.Graph module for more information.
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query_stream(graph, query, opts \\ [])

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Returns a Stream for the execution of the given query against the given graph.

This is just a convenience delegator function to RDF.Query.stream!/3 with the first two arguments swapped so it can be used in a pipeline on a RDF.Graph.

See RDF.Query.stream/3 and RDF.Query.stream!/3 for more information and examples.