oc.dict.values/keys support relative keys

[ssnl]

oc.dict.values/keys currently only uses absolute keys, which makes it annoying in implementing some cases, e.g., workaround described in facebookresearch/hydra#1939. However, supporting relative keys are easy (just call _get_full_key())!

[Jasha10]

It seems that oc.dict.keys does work with relative dotpaths but oc.dict.values does not.

from pytest import raises
from omegaconf import OmegaConf
from omegaconf.errors import InterpolationResolutionError

cfg = OmegaConf.create(
    {
        "workers": {
            "node3": "10.0.0.2",
            "node7": "10.0.0.9",
        },
        "nodes": "${oc.dict.keys: workers}",
        "ips": "${oc.dict.values: workers}",
        "nodes_relative": "${oc.dict.keys: .workers}",
        "ips_relative": "${oc.dict.values: .workers}",
    }
)
assert cfg.nodes[0] == "node3"
assert cfg.ips[0] == "10.0.0.2"
assert cfg.nodes_relative[0] == "node3"
with raises(InterpolationResolutionError):
    cfg.ips_relative[0]