how to search with a column from reference table in g:ui_reference in ui page

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Hi 

I have one reference field in my UI  page created using g:ui_reference and it refer to sys_user table . 

currently I can search with name of user in that reference field.

Is there any way to search with employee_number field in sys_user ?

I am using below tag.

<g:ui_reference name="user" id="user" table="sys_user" completer="AJAXTableCompleter" columns="name;employee_number" query='active=true^employee_numberISNOTEMPTY'/>