Oracle Discoverer 10g How to kown User that ran the report

User that ran the report:

SELECT

DISTINCT QPP.QS_DOC_NAME WORKBOOK_NAME,QPP.QS_DOC_DETAILS WORKSHEET,

QS_DOC_OWNER WORKBOOK_OWNER,

qs_created_date, qs_cost, qs_act_elap_time, qs_act_cpu_time,

QPP.QS_CREATED_BY OWNER, f.user_name

FROM

eul5_us.EUL5_QPP_STATS QPP, fnd_user f

where substr(qs_created_by, 2, 4) = to_char(f.user_id)