I'm not aware of any way of doing this with default functionality if you allow users to set a resolution via the dropdown. The simplest way we've found is to create a "User Picker" custom field called "Resolver" (for example.) Install the Jira Misc Custom Fields App. It's not free, but it has a bunch of cool features. In the workflow transition that you set the Resolution field in, add a "Update Issue Custom Field" post function to populate the Resolver field with %%CURRENT_USER%% and you can use normal JQL to gather the information. If you allow issues to be reopened or unresolved, you need to be sure to clear the field, along with the Resolution field as well.
...It's true that there are projects in Jira; but they are merely a way to cut off issues, to tell them apart from other sections of work and to apply rules that are specific to that team (the schemes)....
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