Bugs item #1644556, was opened at 2007-01-25 17:03
Message generated for change (Settings changed) made by mvankeulen
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Category: PF/compiler
Group: Pathfinder CVS Head
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Maurice van Keulen (mvankeulen)
>Assigned to: Jan Rittinger (tsheyar)
Summary: for-at-in combined with recursion counts wrong
Initial Comment:
The "for $var at $pos in $seq return ..." construct gives wrong values for $pos
when recursion is involved. Consider the following query:
declare function test($l1 as node()*, $l2 as node()*)
{
<test>{$l1}<with/>{$l2}<returns>{
for $e1 at $p1 in $l1
,$e2 at $p2 in $l2
where ($e1/name() eq $e2/name())
return (
<found>{$e1}<with/>{$e2}
<cand a="{$p1}" b="{$p2}"/>
</found>
,if ($e1/* or $e2/*)
then <rec>{test($e1/*,$e2/*)}</rec>
else ()
)
}</returns></test>
};
let $l1 := (<a/>,<b/>,<d><y/></d>,<c><x/></c>)
,$l2 := (<b/>,<b/>,<d><x/><y/></d>,<a/>,<c><x/><y/></c>)
return
<a>{
test($l1,$l2)
}</a>
This query tries to find positions of elements with the same name in two
sequences and does this recursively for their children. Below an excerpt of the
output
<test>
<x/>
<with/>
<x/>
<y/>
<returns>
<found>
<x/>
<with/>
<x/>
<cand b="3" a="1"/>
</found>
</returns>
</test>
Note the b="3" there, while we are testing a sequence of one element with a
sequence of two elements. This is clearly wrong, because the position should
never exceed 2 here.
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