\set ECHO none
add_provenance

(1 row)
add_provenance

(1 row)
remove_provenance

(1 row)
l3|r2|l2|wprov
10|one|a|{[wpj_left::3],[wpj_right::2],[wpj_left::2],[]}
20|two|b|{[wpj_left::3],[wpj_right::2],[wpj_left::2],[]}
30|three|c|{[wpj_left::3],[wpj_right::2],[wpj_left::2],[]}
(3 rows)