This package exposes a class views_query_planning.QueryComposer that makes it
possible to generate queries against a relational database using a network
representation of the database. Such networks can be inferred using the
views_query_planning.join_network function that takes a dictionary of
sqlalchemy tables and returns a networkx.DiGraph that can be passed to the
composer.
For an example service that uses the QueryComposer class to expose columns in a relational DB RESTfully, see base_data_retriever.