feat: add opt WithSQLNullType #1965

Job	Run time
tests (1.21, ubuntu-latest)	2m 45s
tests (1.21, ubuntu-latest)	2m 45s
tests (1.20, ubuntu-latest)	2m 44s
tests (1.20, ubuntu-latest)	2m 44s
mysql (mysql:5.7, 1.21, ubuntu-latest)	1m 26s
mysql (mysql:5.7, 1.21, ubuntu-latest)	1m 22s
tests (1.19, ubuntu-latest)	2m 40s
tests (1.19, ubuntu-latest)	2m 40s
mysql (mysql:5.7, 1.20, ubuntu-latest)	1m 26s
mysql (mysql:5.7, 1.20, ubuntu-latest)	1m 25s
tests (1.18, ubuntu-latest)	2m 38s
tests (1.18, ubuntu-latest)	2m 38s
mysql (mysql:5.7, 1.19, ubuntu-latest)	1m 23s
mysql (mysql:5.7, 1.19, ubuntu-latest)	1m 20s
mysql (mysql:5.7, 1.18, ubuntu-latest)	1m 24s
mysql (mysql:5.7, 1.18, ubuntu-latest)	1m 23s
mysql (mysql:latest, 1.21, ubuntu-latest)	1m 26s
mysql (mysql:latest, 1.21, ubuntu-latest)	1m 27s
mysql (mysql:latest, 1.20, ubuntu-latest)	1m 32s
mysql (mysql:latest, 1.20, ubuntu-latest)	1m 22s
mysql (mysql:latest, 1.19, ubuntu-latest)	1m 20s
mysql (mysql:latest, 1.19, ubuntu-latest)	1m 22s
mysql (mysql:latest, 1.18, ubuntu-latest)	1m 25s
mysql (mysql:latest, 1.18, ubuntu-latest)	1m 28s
	44m 5s

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