I would actually look at an ORM framework as reference, like for example hibernate criteria: https://docs.jboss.org/hibernate/entitymanager/3.5/reference/en/html/querycriteria.html. However not saying this is the best example

My thinking is to provide a simplistic query ability over what we can do with primitives such as filter and project. The main use case i see is bulk extracts either for backup or replication or pulling out large datasets with some basic filtering and limiting of columns into a machine learning framework in python or spark. Functions / mapping of these values is probably out of scope as it can be done in the client code. For the former use case of replication / filtering it likely would be an advantage to offer some positional metadata / filtering too allowing for incremental extracts.

Obviously the hope is that this can be a lot faster (but less flexible) than going through the sql layer.

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