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create table tbl
(
id bigint primary key,
a int
);
✓
hidden batch(es)
insert into tbl (id, a)
select s, case when random() < .5 then s end
from generate_series(0, 100) s;
select *
from tbl;
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…
hidden batch(es)
create function coalesce_r_sfunc(state anyelement, value anyelement)
returns anyelement immutable parallel safe
as
$$
select coalesce(value, state);
$$
language sql;
