Fix warning #700

Job	Run time
Rustfmt	16s
Clippy	1m 4s
Compile Postgres (live/postgres)	1m 9s
Compile MySQL (live/mysql)	1m 18s
Compile SQLite (live/sqlite)	1m 6s
Compile Postgres (discovery/postgres)	1m 10s
Compile MySQL (discovery/mysql)	1m 9s
Unit Test	1m 22s
Compile SQLite (discovery/sqlite)	1m 1s
Compile Postgres (writer/postgres)	1m 9s
Compile MySQL (writer/mysql)	1m 8s
Compile SQLite (writer/sqlite)	1m 0s
SQLite (live/sqlite)	25s
SQLite (discovery/sqlite)	30s
SQLite (writer/sqlite)	13s
Postgres (14.4, live/postgres)	56s
Postgres (14.4, discovery/postgres)	1m 1s
Postgres (14.4, writer/postgres)	1m 9s
MariaDB (10.6, live/mysql)	56s
MariaDB (10.6, discovery/mysql)	52s
MySQL (8, live/mysql)	54s
MariaDB (10.6, writer/mysql)	34s
MySQL (8, discovery/mysql)	52s
MySQL (8, writer/mysql)	1m 4s
MySQL (5.7, live/mysql)	51s
MySQL (5.7, discovery/mysql)	53s
MySQL (5.7, writer/mysql)	46s
	24m 48s

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