proposal: Computed data queries

Sometimes we want to query data using a dynamic query that isn't supported in hypergraph, and instead of returning an entity, we might want to return a computed value.

For example, there are a set of entities with the Episode type. Each episode points to a Podcast. I might want to calculate how many episodes a podcast has.

This would require a mechanism for users to specify queries to make against the graph with syntax for aggregations, selecting, filtering, etc. We could make it type safe by integrating it with our schema language.

Non vengono indicati file di implementazione, test o punti di ingresso. Inizia esaminando le API esistenti per le query sugli ipergrafi e per i linguaggi di schema, quindi definisci l’ambito e i criteri di accettazione per aggregazioni, selezione, filtraggio e valori calcolati.