Bugs item #1928084, was opened at 2008-03-28 17:11
Message generated for change (Comment added) made by stmane
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Category: PF/runtime
Group: Pathfinder CVS Head
Status: Closed
Resolution: Fixed
Priority: 5
Private: No
Submitted By: Jan Rittinger (tsheyar)
Assigned to: Peter Boncz (boncz)
Summary: XQ: Ancestor step with debug=10 broken
Initial Comment:
The following query:
doc("foo.xml")//text()/ancestor::b
does return the correct result (<b>textnode</b>) if run with --debug=0. With
--debug=10 as during testing no results are returned (-- see also
tests/XQuery/step_attr_nametest).
The problem arises in loop_lifted_ancestor_step_with_nsloc_test().
$ cat foo.xml
<a foo="bar"><b>textnode</b><d><e/><f/></d><c foo2="bar"/></a>
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>Comment By: Stefan Manegold (stmane)
Date: 2008-05-08 16:14
Message:
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Is this problem covered by any existing test?
Otherwise, we should consider adding one to monitor the fix ...
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Comment By: Peter Boncz (boncz)
Date: 2008-03-30 01:58
Message:
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thanks for the bug. turned out to be a very deep MonetDB problem coming
from oids being stored as either int/lng but being treated as unsigned.
Especially nil may cause surprises, since as an oid it seems > 0, however
as a signed integer it is < 0.
This particular code happened to produce a bat with an oid column starting
with nil. With debug=10, the sorting order would be detected on this
column, such that in the leftfetchjon code a wrong direct oid comparison on
the values was done. One should use ATOMcmp(TYPE_oid,x,y) instead.
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