Bugs item #2668437, was opened at 2009-03-06 15:30
Message generated for change (Comment added) made by stmane
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Category: PF/runtime
Group: Pathfinder "stable"
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Jan Rittinger (tsheyar)
>Assigned to: Peter Boncz (boncz)
Summary: PF runtime: parent step sets properties incorrectly
Initial Comment:
The following query returns the wrong number:
count(doc("consumer04.xml")//properties/../properties)
The reason is the parent step implementation (loop_lifted_parent_step) that
makes some assumptions that are not true (see following example).
If I run the following query with debug mask 10 I get a warning:
> echo 'count(doc("consumer04.xml")//properties/..)' | pf | Mserver --debug=10
#BATpropcheck: BAT tmpr_2464(-1332)[oid,oid] with 1156921 tuples was
incorrectly marked sorted!
#BATpropcheck: BAT tmpr_2464(-1332)[oid,oid] with 1156921 tuples remains marked
radix-clustered on 32 bits; not checked!
<?xml version="1.0" encoding="utf-8"?>
<XQueryResult>1156921</XQueryResult>
The document consumer04.xml is linked in the XIRAF testset in the pathfinder
wiki.
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>Comment By: Stefan Manegold (stmane)
Date: 2009-03-12 19:13
Message:
I assume, that it is not the properties that are set incorrectly --- the
result of PFll_parent is supposed to be ordered on [iter,pre], i.e., with
only one iter this also means that it is sorted in pre --- hence, I suspect
that either the ll_upwards implementation itself is wrong in this case,
since is produces an obviously not sorted pre column, or is is working on
inconsistent data/input due to a previous bug elsewhere, and hence, works
incorrectly ...
... also getting Peter as original author of the ll_upwards code involved
...
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