Support matchExpressions for selector

[tvandinther]

What problem are you facing?

I want to select based on the existence of a label regardless of its value.

How could this Function help solve your problem?

Offer a the standard matchExpressions selector API common to Kubernetes.

matchExpressions:
    - { key: tier, operator: In, values: [cache] }
    - { key: environment, operator: NotIn, values: [dev] }
    -  { key: environment, operator: Exists }

[phisco]

that'd be cool, but crossplane only supports key/value selectors, so we'd have to either "reimplement" them as filters on our side, or add support for expressions upstream.

[tvandinther]

Yeah I learned this afterwards. Perhaps a worthy feature for upstream required resources selection.