Math expressions don't work in dashboard panels

[kostrse]

What happened:

Any math expressions result in error "e.replace is not a function"

How to reproduce it (as minimally and precisely as possible):

1. Add two queries A and B which successfully return data
2. Add an expression, "Math", "$A + $B"
3. See the error "e.replace is not a function"

Screenshots

Anything else we need to know?:

Environment:

• Grafana version: 9.1.x
• Plugin version: main

[kostrse]

There's another bug #311 but reported error is different. In my case expressions do not work at all.

[aangelisc]

Thanks for the report @kostrse, I can confirm I've reproduced this and I'm investigating the cause 😊

[aangelisc]

I've identified the issue is because of this line. As ADX has the expression property defined (but as an object), the replace property does not exist which causes this error. I'll have a look at a fix for this 😊

[aangelisc]

On further investigation this seems to be a bug in Grafana backend where the incorrect datasource reference is used. Issue here.