Você pode usar
dynamic sql
em anonymous pl/sql
quadra; Begin
for i in (select part_name from ... //expression to get partition names) loop
execute immediate 'ALTER TABLE TMP DROP PARTITION ' || i.part_name;
end loop;
end;
Para descartar várias partições em movimento;
declare
v_part varchar(1000);
Begin
select LISTAGG(partition_name, ', ') WITHIN GROUP (ORDER BY partition_name DESC)
into v_part
from ... //expression to get partition names;
execute immediate 'ALTER TABLE TMP DROP PARTITION ' || v_part;
end;