Filter by child node predicate in GraphQL

[amaster507 (Anthony Master)]

RFC hopefully still in progress:

RFC: Nested Filters in GraphQL

Motivation There are many requests from the community to add nested filters in GraphQL and it’s also one of the feature which can add more flexibility and value in our GraphQL implementation. Nested Filters like below are not supported in GraphQL . query { queryAuthor( filter: { name: { eq: "Alice" }, or: { posts: { postID: ["0x1", "0x2"] } } } ) { name posts { title } } } Although in DQL this Query is possible using var blocks like below query { post1 as var(…