Add pipe & reducer #4121

Job	Run time
mariadb (locked, 8.3, ubuntu-latest, 10.5)	1m 22s
mysql (locked, 8.3, ubuntu-latest, 5.7)	1m 32s
mariadb (locked, 8.3, ubuntu-latest, 10.6)	1m 21s
Postgres (locked, 8.3, ubuntu-latest, 12.20)	1m 4s
mysql (locked, 8.3, ubuntu-latest, 8.0)	1m 32s
mariadb (locked, 8.3, ubuntu-latest, 10.11)	56s
Postgres (locked, 8.3, ubuntu-latest, 13.16)	1m 22s
mysql (locked, 8.3, ubuntu-latest, 8.4)	1m 3s
mariadb (locked, 8.3, ubuntu-latest, 11.1)	1m 25s
Postgres (locked, 8.3, ubuntu-latest, 14.13)	1m 2s
mysql (locked, 8.3, ubuntu-latest, 9.0)	1m 2s
mariadb (locked, 8.3, ubuntu-latest, 11.4)	52s
Postgres (locked, 8.3, ubuntu-latest, 15.8)	57s
Postgres (locked, 8.3, ubuntu-latest, 16.4)	1m 25s
Postgres (locked, 8.3, ubuntu-latest, 17.0)	1m 0s
Sqlite (locked, 8.3, ubuntu-latest)	21s
	18m 16s

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