Re: Assert failure in find_var_for_subquery_tle

Hi Richard,

The fix looks right to me. The new test trips the Assert without the
pathkeys.c change.

A CTE scan as the member hits the same Assert, example:

set_cte_pathlist().
explain (costs off)
with c as materialized (select q2 from int8_tbl order by q2)
select ss.v from int8_tbl x,
lateral (select x.q1 from c union all
select q2 from int8_tbl) ss(v);

The patch fixes this one too. Maybe the commit message could mention
it as well.

Thanks,
Shihao