Couchbase - Case with subquery - subquery

Question

I am going to write a case which has subquery, something like below, But I cannot get neither out put nor error:
select
case
when f.resGeo.isRural = true
then (select g.ID as geo_id
from bktsample.scpPC.GeoInfo g
where g.PROVINCE_ID = f.resGeo.province.id
and g.CITYES_ID = f.resGeo.countie.id
and g.PART_ID = f.resGeo.part.id
and g.CITYORCOUNTRY_ID = f.resGeo.countie.id
and g.VILLAGE_ID = f.resGeo.village.id)
when f.resGeo.isRural = false
then (select g.ID
from bktsample.scpPC.GeoInfo g
where g.PROVINCE_ID = f.resGeo.province.id
and g.CITYES_ID = f.resGeo.countie.id
and g.PART_ID = f.resGeo.part.id
and g.CITYORCOUNTRY_ID = f.resGeo.countie.id)
end as geo_id
from bktsample.scpPC.Family f;
PS: GEO is my collection, scpPC is my scope and bktsample is my bucket.

Answer 1

Each document in the Family collection should have returned one document of geo_id (either empty array or objects of ID)
Small change to your query:
CREATE INDEX ix1 ON bktsample.scpPC.Family(resGeo.province.id, resGeo.countie.id, resGeo.part.id, resGeo.countie.id, resGeo.village.id, resGeo.isRural);
CREATE INDEX ix2 ON bktsample.scpPC.GeoInfo(PROVINCE_ID, CITYES_ID, PART_ID, CITYORCOUNTRY_ID, VILLAGE_ID, ID);
SELECT
(SELECT g.ID AS geo_id
FROM bktsample.scpPC.GeoInfo AS g
WHERE g.PROVINCE_ID = f.resGeo.province.id
AND g.CITYES_ID = f.resGeo.countie.id
AND g.PART_ID = f.resGeo.part.id
AND g.CITYORCOUNTRY_ID = f.resGeo.countie.id
AND (f.resGeo.isRural == false OR g.VILLAGE_ID = f.resGeo.village.id))
) AS geo_ids
FROM bktsample.scpPC.Family f
WHERE f.resGeo.province.id IS NOT NULL;