Add nested relations - Githubissues

dkubb / axiom

Simplifies querying of structured data using relational algebra

https://github.com/dkubb/axiom

MIT License

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Add nested relations #40

Closed dkubb closed 10 years ago

dkubb commented 10 years ago

This branch will add support for nested relations. It will add #nest and #unnest operators to Axiom::Relation. It should add an Axiom::Relation attribute type. It should also propagate materialization, insertion and deletion across nested relations.

[x] Add Axiom::Attribute::Relation
[x] Add Axiom::Relation::Operation::Nest and Axiom::Relation#nest
[x] Add Axiom::Relation::Operation::Unnest and Axiom::Relation#unnest
[x] Refactor Axiom::Relation::Nest and Axiom::Algebra::Join to use the same object to build the join index.

dkubb commented 10 years ago

I will need to consider #wrap and #unwrap for the future too.

EDIT: These are for nested tuples, not nested relations like nest/unnest.