Bugs item #2791704, was opened at 2009-05-14 14:51
Message generated for change (Comment added) made by tsheyar
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>Category: PF/compiler
>Group: Pathfinder "stable"
>Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Floris Ouwendijk (floris233)
>Assigned to: Jan Rittinger (tsheyar)
Summary: Unuseable 'doc-available' test
Initial Comment:
Given the following code, I'd assume to get an empty b element (for a database
not containing the given document).
if (doc-available('asdasda'))
then doc('asdasda')
else element b{}
The result happens to be
QUERY = if (doc-available('asdasda'))
ERROR = !ERROR: [shred_url]: 1 times inserted nil due to errors at tuples
0...@0.
!ERROR: [shred_url]: first error was:
!ERROR: shred: cannot stat `asdasda': No such file or directory
!ERROR: CMDshred_url: operation failed.
!ERROR: interpret_params: leftfetchjoin(param 2): evaluation error.
If I do
if (doc-available('asdasda'))
then element a{}
else element b{}
Then i get b.
----------------------------------------------------------------------
>Comment By: Jan Rittinger (tsheyar)
Date: 2009-05-20 16:44
Message:
I implemented the side effect for fn:doc (as proposed before) in the
algebra:
An error is now only triggered whenever the condition chooses the branch
with the non-exisiting document.
Added test (unuseable_doc-available.SF-2791704).
Note: The call to fn:doc (and all subsequent operations) in the
then-branch are still evaluated...
----------------------------------------------------------------------
Comment By: Jan Rittinger (tsheyar)
Date: 2009-05-14 17:44
Message:
The only clean solution I see is to mimic the side effects in the algebra
and remove the error from the doc_tbl MIL proc.
----------------------------------------------------------------------
Comment By: Jan Rittinger (tsheyar)
Date: 2009-05-14 16:33
Message:
Hmmm...
I have no good solution for that but I can explain the problem: The
algebraic optimizer detected that the if-, then-, and else-branches are
independent of each other. Therefore all three expressions (also containing
the doc() call) are evaluated in parallel and their respective interaction
is only resolved later.
----------------------------------------------------------------------
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