Fix bug #4646 #416

Job	Run time
run / test (mysql57, pymysql)	1s
run / test (mysql57, pymysql)	51m 26s
run / test (mysql57, mysqldb)	1s
run / test (mysql57, mysqldb)	51m 53s
run / test (mysql57, asyncmy)	1s
run / test (mysql57, asyncmy)	55m 57s
run / test (mysql57, mariadbconnector)	1s
run / test (mysql57, mariadbconnector)	56m 48s
run / test (mysql80, pymysql)	1s
run / test (mysql80, pymysql)	26m 57s
run / test (mysql80, mysqldb)	1s
run / test (mysql80, mysqldb)	23m 19s
run / test (mysql80, asyncmy)	1s
run / test (mysql80, asyncmy)	25m 27s
run / test (mysql80, mariadbconnector)	1s
run / test (mysql80, mariadbconnector)	35m 11s
run / test (mysql84, pymysql)	1s
run / test (mysql84, pymysql)	26m 35s
run / test (mysql84, mysqldb)	1s
run / test (mysql84, mysqldb)	22m 33s
run / test (mysql84, asyncmy)	1s
run / test (mysql84, asyncmy)	24m 24s
run / test (mysql84, mariadbconnector)	1s
run / test (mysql84, mariadbconnector)	33m 33s
run / test (mysql90, pymysql)	1s
run / test (mysql90, pymysql)	26m 34s
run / test (mysql90, mysqldb)	1s
run / test (mysql90, mysqldb)	24m 20s
run / test (mysql90, asyncmy)	1s
run / test (mysql90, asyncmy)	23m 44s
run / test (mysql90, mariadbconnector)	1s
run / test (mysql90, mariadbconnector)	34m 30s
run / summarize	1s
run / summarize	7s
	9h 3m 35s

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