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/* postgres can not */
/* syntax version 1 */
$a = Yql::ToList(()->(Yql::Iterator([1,2,3])));
select ListExtend($a, $a), ListHasItems($a), ListLength($a);
$b = Yql::ToList(()->(Yql::EmptyIterator(Stream<Int32>)));
select ListExtend($b, $b), ListHasItems($b), ListLength($b);
$c = Yql::ToList(()->(Yql::EmptyIterator(Stream<Int32>)));
select ListExtend($b, $b), ListLength($c), ListHasItems($c);
select ListMap(ListFromRange(1,4), ($x)->{
$y = Yql::ToList(()->(Yql::Iterator([1,2,$x])));
return ListExtend($y, $y);
});
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