"trim": does not work correctly on Postgresql

[ndn1991]

Drill 1.21.1
Postgresql 14.6

DrillBit storage configuration:

{
  "type": "jdbc",
  "driver": "org.postgresql.Driver",
  "url": "jdbc:postgresql://<host>/<db_name>",
  "username": "<username>",
  "password": "<password>",
  "authMode": "SHARED_USER",
  "writerBatchSize": 10000,
  "enabled": true
}

Run this query
SELECT TRIM( ' ') AS x FROM path_to_any_table
Asume that the table has only one row.
The actual result:
x

null

The expected result
x

x should be an empty string.
The issue doesn't happen in Drill 1.19.0