PgChannel fetch throws UnsupportedOperationException #1566

Job	Run time
CI-CD / CI (ubuntu-latest, 11, MySQL-8.0) / Run tests	2m 3s
CI-CD / CI (ubuntu-latest, 11, MariaDB-10.4) / Run tests	2m 9s
CI-CD / CI (ubuntu-latest, 11, MySQL-5.7) / Run tests	2m 29s
CI-CD / CI (ubuntu-latest, 11, MSSQL-2017-latest) / Run tests	1m 38s
CI-CD / CI (ubuntu-latest, 25, MySQL-5.7) / Run tests	2m 7s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-9) / Run tests	4m 31s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-10) / Run tests	4m 49s
CI-CD / CI (ubuntu-latest, 11, DB2-11.5) / Run tests	5m 58s
CI-CD / CI (ubuntu-latest, 11, MSSQL-2019-latest) / Run tests	1m 36s
CI-CD / CI (ubuntu-latest, 25, MariaDB-10.4) / Run tests	2m 6s
CI-CD / CI (ubuntu-latest, 25, MSSQL-2019-latest) / Run tests	1m 38s
CI-CD / CI (ubuntu-latest, 25, Oracle-23) / Run tests	2m 1s
CI-CD / CI (ubuntu-latest, 11, SQL-templates) / Run tests	6m 19s
CI-CD / CI (ubuntu-latest, 11, PostgreSQL-11) / Run tests	4m 10s
CI-CD / CI (ubuntu-latest, 25, PostgreSQL-11) / Run tests	4m 37s
CI-CD / CI (ubuntu-latest, 11, MySQL-5.6) / Run tests	2m 15s
CI-CD / Deploy to OSSRH	0s
	50m 26s

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