tests/httpd/scripts/number-comparison test is failing

[ssssam]

Hi!
First, thanks for releasing 4Store, it looks really useful. I'm just getting started with it myself!
I noticed that when I run make test in 'master' (commit 1b31202) the number-comparison test fails.

This is the diff created by run.pl --outdir out scripts/number-comparsion:

10,11d9
< -2.500001
< -2.500001e0
13c11,12
< "-2.5"^^<http://www.w3.org/2001/XMLSchema#float>

---
> -2.500001e0
> -2.500001
15a15
> "-2.5"^^<http://www.w3.org/2001/XMLSchema#float>
17d16
< -2.499999e0
18a18
> -2.499999e0
22,23d21
< 0
< +0
24a23,24
> +0
> 0
31d30
< 2.5e0
32a32
> 2.5e0
36d35
< 1234
37a37
> 1234
44d43
< "+23.0e999999999999999999999999"^^<http://www.w3.org/2001/XMLSchema#float>
45a45
> "+23.0e999999999999999999999999"^^<http://www.w3.org/2001/XMLSchema#float>
53,54d52
< -2.500001
< -2.500001e0
55a54,55
> -2.500001e0
> -2.500001
59d58
< -2.499999e0
60a60
> -2.499999e0
62,63d61
< 0
< +0
64a63,64
> +0
> 0
71d70
< 2.5e0
72a72
> 2.5e0
76d75
< 1234
77a77
> 1234
84d83
< "+23.0e999999999999999999999999"^^<http://www.w3.org/2001/XMLSchema#float>
85a85
> "+23.0e999999999999999999999999"^^<http://www.w3.org/2001/XMLSchema#float>
88,89d87
< -2.500001
< -2.500001e0
91c89,90
< "-2.5"^^<http://www.w3.org/2001/XMLSchema#float>

---
> -2.500001e0
> -2.500001
93a93
> "-2.5"^^<http://www.w3.org/2001/XMLSchema#float>
95d94
< -2.499999e0
96a96
> -2.499999e0

[ssssam]

Looking at it closely, it seems like there aren't actually actual numerical errors going on, it's just that the ordering of different types has changed.

For example, for this query: BASE <http://example.com/> SELECT ?o WHERE { GRAPH <http://example.com/numbers.ttl> { ?s <test:num> ?o . FILTER (?o < -2) . }} ORDER BY ?o

Expected result includes:

-2.500001                                              
-2.500001e0                                            
"-2.500001"^^<http://www.w3.org/2001/XMLSchema#float> 
"-2.5"^^<http://www.w3.org/2001/XMLSchema#float>      
-2.5                                                  
-2.5e0                                                
-2.499999                                             
-2.499999e0                                           
"-2.499999"^^<http://www.w3.org/2001/XMLSchema#float> 
-2.00050000                                           

Actual result includes:

"-2.500001"^^<http://www.w3.org/2001/XMLSchema#float>  
-2.500001e0
-2.500001
-2.5
-2.5e0
"-2.5"^^<http://www.w3.org/2001/XMLSchema#float>
-2.499999                                              
"-2.499999"^^<http://www.w3.org/2001/XMLSchema#float>  
-2.499999e0                                            
-2.00050000

The numbers are still in the right order, but the string cast to a float is now sorted before the float, instead of after it. The other errors seem to be similar things.

[swh]

Odd - I can't think of any reason why the ordering would have changed...