dimon222 commented on a change in pull request #19725:
URL: https://github.com/apache/airflow/pull/19725#discussion_r755411001



##########
File path: airflow/providers/postgres/hooks/postgres.py
##########
@@ -184,7 +184,8 @@ def get_iam_token(self, conn: Connection) -> Tuple[str, 
str, int]:
             # Pull the custer-identifier from the beginning of the Redshift URL
             # ex. my-cluster.ccdre4hpd39h.us-east-1.redshift.amazonaws.com 
returns my-cluster
             cluster_identifier = conn.extra_dejson.get('cluster-identifier', 
conn.host.split('.')[0])
-            client = aws_hook.get_client_type('redshift')
+            session, endpoint_url = aws_hook._get_credentials()
+            client = session.client('redshift', endpoint_url=endpoint_url, 
config=aws_hook.config, verify=aws_hook.verify)

Review comment:
       Reread the code fragment - The above mentioned code piece is utilizing 
hook for client_type 'rds', so I think i probably shouldn't be changing the 
client_type it has in hook constructor, as it will break the non-Redshift 
scenario in `else` condition (potentially).




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