----- QUERY EXPRESSION BODY ID : aa...a ----- |
((SELECT C1 FROM T1 ...................query-ID:1
UNION SELECT C1 FROM T2) ..........query-ID:2
UNION ALL SELECT C1 FROM T3) ....query-ID:3
SetOpe Process : LID(1) = [QID(1) LIST(SORT) {...}] UNION [QID(2) LIST(SORT) {...}] |