Dette burde gøre jobbet:
SELECT (y).*
FROM (
SELECT my_aggregate_function(border, lower_limit, upper_limit, operation) AS y
FROM (
SELECT (x).*, operation
FROM (
SELECT my_function(ca.timeslice_id) AS x, agc.operation
FROM geometry_component agc
JOIN volume av ON av.id = agc.volume_id
JOIN volume_dependency avd ON avd.id = av.contributor_id
JOIN my_rowset_function('2013-02-22') ca ON ca.feature_id = avd.id
WHERE agc.timeslice_id = 12345
ORDER BY agc.sequence
) sub1
)sub2
)sub3