How can I extract returned lastUpdatedTime field from the following N1QL query in Couchbase version 7.0.3 and use it in an update query - nosql

Question

I have the following query;
SELECT b.lastUpdatedTime
FROM `bag` b WHERE b.staticBar='ABC1234511991'
ORDER BY b.lastUpdatedTime DESC LIMIT 1
Which returns the following response
[
{
"lastUpdatedTime": 1672840089805
}
]
I would like to extract lastUpdatedTime field from the response array so that I can use that value in another query such as this;
UPDATE `bag` SET updated = true
WHERE staticBar='ABC1234511991'
AND lastUpdatedTime IN
(
SELECT lastUpdatedTime FROM `bag` AS bs
WHERE bs.staticBar='ABC1234511991'
ORDER BY bs.lastUpdatedTime DESC LIMIT 1
)
Write now the update query does not apply any update although the there is a data available.
I tried to use UNNEST and MERGE syntax but failed to achieve my goal

Answer 1

Use RAW in subquery so that it will generate ARRAY of values vs ARRAY of Objects.
CREATE INDEX ix1 ON bag(staticBar, lastUpdatedTime DESC);
UPDATE `bag` SET updated = true
WHERE staticBar='ABC1234511991'
AND lastUpdatedTime IN
(
SELECT RAW lastUpdatedTime FROM `bag` AS bs
WHERE bs.staticBar='ABC1234511991'
ORDER BY bs.lastUpdatedTime DESC LIMIT 1
);
Above one not optimal because right side of IN is subquery, so not able to push the predicate to indexer. So use following merge statement
MERGE INTO bag AS m USING (SELECT b.lastUpdatedTime
FROM `bag` b
WHERE b.staticBar='ABC1234511991'
ORDER BY b.lastUpdatedTime
DESC LIMIT 1) AS s
ON s.lastUpdatedTime = m.lastUpdatedTime
WHEN MATCHED THEN UPDATE SET m.updated = true;