I have a custom field in JIRA of type "User Picker (multiple users)". Let's call it Approvers.
I'd like to write some JQL like "Approvers" > 3, but JIRA is unhappy about that saying "The operator '>' is not supported by the 'Approvers' field.".
Is this even possible?
That's because "approvers" is a list of users. The question you're asking if translated into plain English is "Are Dave, Alice and Bob greater than three?". Which is not a valid question.
You will need to set up a sensible question - either create a JQL function that will count up the number when given a field name, or a custom scripted field that can add it up. Either way, you'll need an add-on of some sort to provide the code to do this.
In case others run into the same problem, I wound up using automation to solve my problem.
Specifically, I wound up creating a hidden number field, that when the "User Picker (multiple users)" field was updated, it would use issue.field.customfield_1234.size to update the count of the hidden number field.
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