Aggregate function sum() and count(Distinct()) takes more than minute to return result in influxsql

I am executing one influxSQL query which is returning result in more than 1 minutes.
Query :

select SUM(call_duration) as total_duration,Count(Distinct(recipient_id)) as total_recipients from xyz where target_id = '1';

Separate queries like

select Count(Distinct(recipient_id)) as total_recipients from xyz where target_id = '1';

select SUM(call_duration) as total_duration from xyz where target_id = '1';

are also takes more than 1 minutes to result the return .

while query

select MAX(call_duration), MIN(call_duration) from xyz where target_id = '1';

Return results very fast, in seconds like 3-4 seconds.

table(measurements) xyz is very large. there are more than 10 million records that matches this where condition.
call_duration and recipient_id are Fields while target_id is Tag

While MIN and MAX function returning results very fast, i suspect why SUM is taking more time?

InfluxDB version: 1.7.4
Machine Configuration - AWS EC2 - t2.medium (4 GB RAM)

Config file:

dir = "/var/lib/influxdb/meta"
dir = "/var/lib/influxdb/data"
wal-dir = "/var/lib/influxdb/wal"
series-id-set-cache-size = 100
enabled = true
auth-enabled = true
log-enabled = true
access-log-path = "/var/log/influxdb/http_access.log"
write-tracing = false
max-body-size = 0
max-concurrent-write-limit = 0

I think that result should returned in 5-6 seconds