unwrap the adapter before checking its instance #1699

Job	Run time
Coding Standard & Static Analysis	40s
testsuite (8.2, sqlite)	48s
testsuite (7.4, mysql)	49s
testsuite (7.4, sqlite, prefer-lowest)	47s
testsuite (7.4, sqlite)	43s
testsuite (8.2, pgsql)	42s
testsuite (7.4, pgsql)	50s
testsuite (8.2, mysql)	53s
	6m 12s

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