[Bug]: Querying a pruned height returns a generic error code

[gibson042]

Is there an existing issue for this?

• I have searched the existing issues

What happened?

When trying to query anything with a --height that is pruned, the response is an error with codespace "sdk" and code 18 ("invalid request") as seen in e.g. Agoric/agoric-sdk#9033 . This is the same code as is used for responding to a proof-covered query when height <= 1, but unlike that case, the client's request is not invalid—rather, it is unserviceable due to server-side state that is not known a priori. As such, the response should indicate that difference by not reusing the code.

Looking at types/errors/errors.go, code 38 ("not found") or possibly code 26 ("invalid height") would seem more appropriate (but of the two, I much prefer "not found" because "invalid height" is already used for request height > lastBlockHeight, which like height <= 1 is actually a problem on the client side.

Cosmos SDK Version

0.50.5, main

How to reproduce?

Query a node with --height <pruned_height_number> for a pruned block.