Ecto.Adapters.SQL.Connection.stream

You're seeing just the callback stream, go back to Ecto.Adapters.SQL.Connection module for more information.
Link to this callback

stream(connection, statement, params, options)

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Specs

stream(connection(), statement(), params(), options :: Keyword.t()) :: Enum.t()

Returns a stream that prepares and executes the given query with DBConnection.