Can't compile expression that return objects with mixed properties types

[sgendre]

Question

Hi,
I am playing with playground to scope what is achievable or not with CEL
and to spot what is valid CEL syntax or not.

Further Information

I try to implement an expression that return an object base on name
This example is for simplicity purpose only.
input: person: name: 'sam'

expression KO person.name == 'sam' ? { 'status': 'adult', 'age': 39} : { 'status': 'unknown', 'age': 0} is failing to compile

but as soon as I change "age" and "adult" properties to string
expression OKperson.name == 'sam' ? { "status": "adult", "age": "39"} : { "status": "adult", "age": "0"} it compiles and is evaluated

and even inconsistent object shape return is fine as long as all properties does have the same type
expression OK2 person.name == 'sam' ? { 'status': 'adult', 'age': '39'} : { 'status': 'unknown'}

Why is there such constraint?

You can play directly with
https://playcel.undistro.io/?content=H4sIAAAAAAAAA51TTUvDQBD9K2M8RKG2gicDRUQKflQrioiQy9hM08Xd2bAfrUX6351Ng6WHipgc8rIz897bmd2vbEo6K7LBAF5JT60hCBbCnOBqNIZHjava2cjVQcmSsrsGygMyKA7kcBrUgoTj%2FdJ7Mu96BY1dkqMKiBfKWTbEIXHTZ6OtI6msEian2shShflG1xpjGUafjSPvlcAxch2xJjgS%2FeN%2BctK6OYFXpwLBykbXWqNtzVyku6QXTy0xOkKQUMJeVQQz68R8EwNUGLAnGN4u78cgy7fPk4cUNxg6lsfEDPlT5LzdxQJ1xD3iWKNiH1qlrUBHNOr2n%2BqmVmuSzkmNnQkDmkaT74z5RjlMsbJ9pVjG0yjdrsHdpGRpnrfcZ5SpDYeQezQ5XMCXoIAh%2BryAHKuoQ94TUJP8n52vodjNiPzBdsnbnFNYd4KTu%2FT5u8xe7v8S%2FnjKz85%2FYc96WerwTeq1HOZDuJbxp%2BO5O4E9E%2B4ncxtPRckgT3JWbHyVLOTGViS86aqsvwHRXEQqMgMAAA%3D%3D

Screenshots

System Information

• OS: MacOS
• OS Version: Latest

Additional Context

I dont know if the issue is specific to cel-playground or to the underlying used implementation

Thank for your time or for that online tool, it is so helpful to ramp-up 👍

[matheusfm]

Hi @sgendre, thank you for opening this issue!

This expression is failing because CEL Playground disables mixed types for lists and maps.
It's being explicitly disabled by setting cel.HomogeneousAggregateLiterals() and cel.ValidateHomogeneousAggregateLiterals() options.

These options are set to follow the same configuration as Kubernetes.

Note, it's still possible to have mixed types when provided as input variable (right text area).

You can also define your CEL environment without these options.
Here’s a version without them: https://heterogeneous-aggregates.cel-playground.pages.dev/
Available starting from this PR: #99.