I happened to notice that while writing this in plpgsql
will consider a parallel plan:
select count(*) into s from tenk1 where ten = x;
writing this will not:
s := count(*) from tenk1 where ten = x;
Is that intentional? Seems to me these cases ought to be
treated the same.
The reason for it is that exec_assign_expr's call of
exec_prepare_plan does not specify CURSOR_OPT_PARALLEL_OK.
regards, tom lane