ABCI Range Query

[rigelrozanski]

We need a way to query a range from a store
Right now we are only able to query from a key:
https://github.com/cosmos/cosmos-sdk/blob/develop/client/core/core.go#L45

[jackzampolin]

Should this be an issue on Tendermint? and is this still #prelaunch?

[rigelrozanski]

I think we might need this lite client proofs - not 100% certain - either way we want this feature

[jackzampolin]

Range queries returning lite client proofs. This sounds like an issue for Tendermint right? I'm guessing this is still a requirement.

[rigelrozanski]

in a big way yes it is

[alexanderbez]

Errrrr, this is 100% doable right now completely in the SDK. As you've stated, yes we support key queries with proofs. We can easily extend baseapp to allow for range queries (with proofs). The IAVL store would just call GetVersionedRangeWithProof|GetRangeWithProof.

I can pick this up.

[jackzampolin]

Any update here @alexanderbez? Is this something that is going to require the lite client spec from TM?

[alexanderbez]

@jackzampolin just an issue we need to prioritize/story-point. There is zero dependency on TM from what I can remember.

[tac0turtle]

being worked on with the schema package