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PRAGMA DisableSimpleColumns;
/* postgres can not */
$i = (select 1 as key);
$j1 = (select a2.key,b.key as k from $i as a2 join $i as b on a2.key = b.key);
select a.* from $j1 as a join $i as d on a.k = d.key;
$j2 = (select a.key,b.key as k from $i as a join $i as b on a.key = b.key);
select a.* from $j2 as a join $i as d on a.k = d.key;
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