Ecto.Adapter.Queryable.stream

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

stream(adapter_meta, query_meta, query_cache, params, options)

View Source

Specs

stream(adapter_meta(), query_meta(), query_cache(), params :: list(), options()) ::
  Enumerable.t()

Streams a previously prepared query.

See execute/5 for a description of arguments.

It returns a stream of values.