In a SQL query, how do I get the saved columns of a saved filter?

[Betsy Walker {Appfire}]

I am trying to do impact analysis of a Jira instance to see where (and whether) a user-installed add-on's custom fields are referenced by filters.  I know the searchrequest table contains the underlying JQL of the filter, and thus can see if a field is referenced in the JQL itself, but what tables do I traverse to see if a custom field is referenced in the columns returned by a saved filter?

Thanks!

[Betsy Walker {Appfire} · Accepted solution]

Figured it out:

SELECT SR.filtername, CLI.fieldidentifier 
FROM columnlayoutitem    CLI
INNER JOIN columnlayout  CL  ON CLI.columnlayout = CL.id
INNER JOIN searchrequest SR  ON CL.searchrequest = SR.id
WHERE CLI.fieldidentifier IN ('customfield_10880','customfield_11280','customfield_10680');