Flatten arrays of string - couchbase

Question

I have the following document
{
"agentId": "agent2",
"date": "2022-08-30",
"metaData": {
"documentCreationDate": "2022-08-30T15:49:21Z",
"documentVersion": "1.0",
"expiry": 1662479361
},
"emailInteractions": [
"0c99ea2a-c235-4c5a-a0bd-aeffba559bca",
"12846a9d-7cc1-4755-b527-cd8aee9d2de4"
],
"voiceInteractions": [
"1c99ea2a-c235-4c5a-a0bd-aeffba559bca",
"22846a9d-7cc1-4755-b527-cd8aee9d2de4"
]
}
And I'm trying to retrieve a list of ids found in emailInteraction and/or voiceInteraction, I'm currently doing the following
SELECT ARRAY_UNION(IFMISSINGORNULL(emailInteractions, []), IFMISSINGORNULL(voiceInteractions, [])) AS ids
FROM `agent-activities`
WHERE agentId = "agent2"
My issue is that it returns this :
[
[
"12846a9d-7cc1-4755-b527-cd8aee9d2de4",
"22846a9d-7cc1-4755-b527-cd8aee9d2de4",
"0c99ea2a-c235-4c5a-a0bd-aeffba559bca",
"1c99ea2a-c235-4c5a-a0bd-aeffba559bca"
]
]
and it bothers me because I need a plain array of strings and not an array of array of strings, because I need to use this list of ids in a where clause in another query with something along the lines of :
WHERE lst.interactionId IN (SELECT raw ARRAY_UNION(IFMISSINGORNULL(emailInteractions, []), IFMISSINGORNULL(voiceInteractions, [])) AS ids
FROM `agent-activities`
WHERE agentId = $agentId)
FYI my main query is this :
SELECT lst.*
FROM (
SELECT iv.id AS interventionId,
vi.direction,
vi.channel,
vi.startDate AS startDate,
vi.id AS interactionId,
vi.customerProfileId
FROM `voice-interactions` AS vi
UNNEST vi.distributions AS dv
UNNEST dv.interventions AS iv
UNION
SELECT ie.id AS interventionId,
ei.direction,
ei.channel,
ei.startDate AS startDate,
ei.id AS interactionId,
ei.customerProfileId
FROM `email-interactions` AS ei
UNNEST ei.distributions AS de
UNNEST de.interventions AS ie) AS lst
WHERE lst.interactionId IN (
SELECT raw ARRAY_UNION(IFMISSINGORNULL(emailInteractions, []), IFMISSINGORNULL(voiceInteractions, [])) AS ids
FROM `agent-activities`
WHERE agentId = $agentId)
ORDER BY startDate ASC
LIMIT $limit
OFFSET $offset
I could use some help to either flatten my array of array into an array somehow or find a better solution than this where clause with the 'property in subquery'

Answer 1

WITH interactionIds AS ( SELECT DISTINCT RAW u
FROM `agent-activities` AS a
UNNEST ARRAY_CONCAT(IFMISSINGORNULL(a.emailInteractions, []), IFMISSINGORNULL(a.voiceInteractions, [])) AS u
WHERE a.agentId = $agentId)
)
SELECT lst.*
FROM (
SELECT iv.id AS interventionId,
vi.direction,
vi.channel,
vi.startDate AS startDate,
vi.id AS interactionId,
vi.customerProfileId
FROM `voice-interactions` AS vi
UNNEST vi.distributions AS dv
UNNEST dv.interventions AS iv
UNION
SELECT ie.id AS interventionId,
ei.direction,
ei.channel,
ei.startDate AS startDate,
ei.id AS interactionId,
ei.customerProfileId
FROM `email-interactions` AS ei
UNNEST ei.distributions AS de
UNNEST de.interventions AS ie) AS lst
WHERE lst.interactionId IN interactionIds
ORDER BY startDate ASC
LIMIT $limit
OFFSET $offset;
Also you can use ARRAY_DISTINCT(ARRAY_FLATTEN((subquery),1))
NOTE: In function argument you need () around subquery treat it as expression