potiuk commented on a change in pull request #7688: [AIRFLOW-6794] Allow AWS 
Operator RedshiftToS3Transfer To Run a Custom Query
URL: https://github.com/apache/airflow/pull/7688#discussion_r390753208
 
 

 ##########
 File path: airflow/providers/amazon/aws/operators/redshift_to_s3.py
 ##########
 @@ -107,7 +112,12 @@ def execute(self, context):
         credentials = s3_hook.get_credentials()
         unload_options = '\n\t\t\t'.join(self.unload_options)
         s3_key = '{}/{}_'.format(self.s3_key, self.table) if 
self.table_as_file_name else self.s3_key
-        select_query = "SELECT * FROM 
{schema}.{table}".format(schema=self.schema, table=self.table)
+        if not self.custom_select_query:
+            if (not self.schema) or (not self.table):
+                raise AirflowBadRequest("schema, table set to None")
+            select_query = "SELECT * FROM 
{schema}.{table}".format(schema=self.schema, table=self.table)
+        else:
+            select_query = self.custom_select_query
 
 Review comment:
   ```suggestion
           if all([self.schema, self.table]):
                 select_query = "SELECT * FROM 
{schema}.{table}".format(schema=self.schema, table=self.table)
           elif self.custom_select_query:
                 select_query = self.custom_select_query
           else:
                raise AirflowBadRequest(f"Either (schema, table) or 
custom_select_query should be set. They are ({self.schema},{self.table}) and 
{self.custom_select_query} now.")
   ```

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