This appears to be an intermittent error that pops up every few weeks,
restarting the DB usually resolves it though not this time.
The query that fails is of the form:
sparql
prefix o: <http://myOntology/>
select *
from <http://myGraph/>
{
?S a o:myClass .
#?S ?P ?O .
}
====
It works until I remove that comment, correctly returning three bindings
for ?S. Once that comment is removed, zero bindings are returned. If I
comment the class line and just return SPO, I can find the ?S in the
triples that matches the class binding.
The explain plan is this:
REPORT
VARCHAR { RDF_QUAD_POGS 8 rows(s_11_2_t0.S) P = ##type , O = #/MyClass G
= #/ Precode: 0: S := Call __id2in (s_11_2_t0.S) 5: BReturn 0 RDF_QUAD_GS
unq 0.5 rows () inlined G = #/ , S = s_11_2_t0.S RDF_QUAD_SP 8.3
rows(s_11_2_t1.P) inlined S = k_s_11_2_t0.S RDF_QUAD_POGS 0.28
rows(s_11_2_t1.O) inlined P = k_s_11_2_t1.P S = k_s_11_2_t0.S , G =
#/ After
code: 0: P := Call __id2in (s_11_2_t1.P) 5: O := Call __ro2sq
(s_11_2_t1.O) 10: BReturn 0 Select (S, P, O) } No. of rows in result: 20
Debug log under trace_on shows nothing unusual.
The instance is:
Version 7.0.1-dev.3207-pthreads as of Feb 3 2014
Compiled for Linux (x86_64-unknown-linux-gnu)
I've quarantined the running instance of the DB and it consistently fails
as above. This behaviour began just a few hours ago, queries of this sort
performed perfectly this morning and then began failing abruptly with no
obvious reason why.
I'm not sure it's related but when I cloned the running instance and
started the DB on the clone, the log includes this error:
05:01:06 ERROR: Error executing a server init statement : 22023: SR528:
Uninitialized property qmfOkForAnySqlvalue in JSO instance <
http://www.openlinksw.com/virtrdf-data-formats#default-iid> of type <
http://www.openlinksw.com/schemas/virtrdf#QuadMapFormat> --
DB.DBA.RDF_QUAD_FT_UPGRADE ()
--
Quentin | Clear Blue Water Pty Ltd
quent...@clearbluewater.com.au
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