Add support for COPY operations #223

Job	Run time
CI (ubuntu-latest, 11, MSSQL-2019-latest) / Run tests	2m 27s
CI (ubuntu-latest, 11, DB2-11.5) / Run tests	4m 35s
CI (ubuntu-latest, 11, MariaDB-10.4) / Run tests	2m 32s
CI (ubuntu-latest, 11, MSSQL-2017-latest) / Run tests	1m 51s
CI (ubuntu-latest, 11, MySQL-5.6) / Run tests	2m 30s
CI (ubuntu-latest, 11, MySQL-5.7) / Run tests	2m 45s
CI (ubuntu-latest, 11, MySQL-8.0) / Run tests	2m 40s
CI (ubuntu-latest, 11, PostgreSQL-10) / Run tests	4m 20s
CI (ubuntu-latest, 11, PostgreSQL-11) / Run tests	4m 35s
CI (ubuntu-latest, 11, PostgreSQL-9) / Run tests	4m 16s
CI (ubuntu-latest, 11, SQL-templates) / Run tests	4m 34s
CI (ubuntu-latest, 17, MariaDB-10.4) / Run tests	2m 46s
CI (ubuntu-latest, 17, MSSQL-2019-latest) / Run tests	2m 17s
CI (ubuntu-latest, 17, MySQL-5.7) / Run tests	2m 37s
CI (ubuntu-latest, 17, Oracle-21) / Run tests	2m 17s
CI (ubuntu-latest, 17, PostgreSQL-11) / Run tests	4m 29s
Deploy to OSSRH	0s
	51m 31s

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